ION EXCHANGEABLE YELLOW GLASS ARTICLES
20230382783 · 2023-11-30
Inventors
- Kaveh Adib (Corning, NY)
- Xiaoju Guo (Pittsford, NY, US)
- Sean Thomas Ralph Locker (Corning, NY, US)
- Lina Ma (Corning, NY, US)
- Nicole Taylor Wiles (Horseheads, NY, US)
Cpc classification
Y10T428/315
GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
C03C21/002
CHEMISTRY; METALLURGY
C03C2204/00
CHEMISTRY; METALLURGY
International classification
Abstract
A glass composition includes SiO.sub.2, Al.sub.2O.sub.3, B.sub.2O.sub.3, alkali metal oxides, alkaline earth oxides, TiO.sub.2, CeO.sub.2, Fe.sub.2O.sub.3, and is provides a yellow-colored glass article.
Claims
1-13. (canceled)
14. A colored glass article, comprising: a glass in mole percent on an oxide basis, comprising: greater than or equal to 53 mol % to less than or equal to 66 mol % SiO.sub.2; greater than or equal to 9 mol % to less than or equal to 18 mol % Al.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 15 mol %; greater than or equal to 0 mol % to less than or equal to 3 mol % P.sub.2O.sub.5; greater than 0 mol % to less than or equal to 16 mol % Li.sub.2O; greater than or equal to 0 mol % to less than or equal to 15 mol % Na.sub.2O; greater than or equal to 0 mol % to less than or equal to 5 mol % K.sub.2O; greater than or equal to 0 mol % to less than or equal to 6 mol % MgO; greater than 0 mol % to less than or equal to 6 mol % CaO; greater than or equal to 0 mol % to less than or equal to 3 mol % ZnO; greater than or equal to 0 mol % to less than or equal to 2 mol % TiO.sub.2; greater than 0 mol % to less than or equal to 2 mol % CeO.sub.2; greater than or equal to 0 mol % to less than or equal to 1 mol % Fe.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 0.5 mol % SnO.sub.2; greater than or equal to 0 mol % to less than or equal to 0.05 mol % SO.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % WO.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % Nb.sub.2O.sub.5; greater than or equal to 0 mol % to less than or equal to 1 mol % Bi.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % MoO.sub.3; and greater than or equal to 0 mol % to less than or equal to 3 mol % La.sub.2O.sub.3; wherein TiO.sub.2+CeO.sub.2 is greater than or equal to 0.2 mol % and less than or equal to 1.5 mol %; and wherein Li.sub.2O+Na.sub.2O is greater than or equal to 8 mol %; wherein the colored glass article has a thickness greater than or equal to 250 μm and less than or equal to 6 mm, wherein the colored glass article is an ion-exchanged colored glass article, wherein the colored glass article comprises a depth of compression greater than or equal to 30 μm, wherein the colored glass article has a surface compressive stress greater than or equal to 300 MPa, wherein the colored glass article has a maximum central tension greater than or equal to 40 MPa; and wherein the colored glass article has a transmittance color coordinate in the CIELAB color space, as measured under F2 illumination and a 10° standard observer angle, of L* greater than or equal to 85 and less than or equal to 98, a* greater than or equal to −4.0 and less than or equal to 0, and b* greater than or equal to 0.1 and less than or equal to 12.0.
15. A consumer electronic device, comprising: a housing comprising the colored glass article of claim 14, wherein the housing has a front surface, a back surface, and side surfaces; and electrical components provided at least partially within the housing, the electrical components including at least a controller, a memory, and a display, the display being provided at or adjacent the front surface of the housing.
16-18. (canceled)
19. A colored glass article, comprising: the glass of claim 16, a glass in mole percent on an oxide basis, comprising: greater than or equal to 53 mol % to less than or equal to 66 mol % SiO.sub.2; greater than or equal to 9 mol % to less than or equal to 18 mol % Al.sub.2O.sub.3; greater than 0 mol % to less than or equal to 15 mol % B.sub.2O.sub.3; greater than 0 mol % to less than or equal to 16 mol % Lip; greater than 0 mol % to less than or equal to 15 mol % Na.sub.2O; greater than or equal to 0 mol % to less than or equal to 5 mol % K.sub.2O; greater than 0 mol % to less than or equal to 6 mol % MgO; greater than 0 mol % to less than or equal to 6 mol % CaO; greater than or equal to 0 mol % to less than or equal to 3 mol % ZnO; greater than 0 mol % to less than or equal to 2 mol % TiO.sub.2; greater than 0 mol % to less than or equal to 2 mol % CeO.sub.2; greater than 0 mol % to less than or equal to 1 mol % Fe.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 0.5 mol % SnO.sub.2; greater than or equal to 0 mol % to less than or equal to 0.05 mol % SO.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % WO.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % Nb.sub.2O.sub.5; greater than or equal to 0 mol % to less than or equal to 1 mol % Bi.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % MoO.sub.3; and greater than or equal to 0 mol % to less than or equal to 3 mol % La.sub.2O.sub.3; wherein TiO.sub.2+CeO.sub.2 is greater than or equal to 0.2 mol % and less than or equal to 1.5 mol %; and wherein Li.sub.2O+Na.sub.2O is greater than or equal to 8 mol %; wherein the colored glass article has a thickness greater than or equal to 250 μm and less than or equal to 6 mm, wherein the colored glass article is an ion-exchanged colored glass article, wherein the colored glass article comprises a depth of compression greater than or equal to 30 μm, wherein the colored glass article has a surface compressive stress greater than or equal to 300 MPa, wherein the colored glass article has a maximum central tension greater than or equal to 40 MPa; and wherein the colored glass article has a transmittance color coordinate in the CIELAB color space, as measured under F2 illumination and a 10° standard observer angle, of L* greater than or equal to 85 and less than or equal to 98, a* greater than or equal to −4.0 and less than or equal to 0, and b* greater than or equal to 0.1 and less than or equal to 12.0.
20. A consumer electronic device, comprising: a housing comprising the colored glass article of claim 19, wherein the housing has a front surface, a back surface, and side surfaces; and electrical components provided at least partially within the housing, the electrical components including at least a controller, a memory, and a display, the display being provided at or adjacent the front surface of the housing.
21. The colored glass article of claim 14, comprising greater than or equal to 6 mol % to less than or equal to 14 mol % Li.sub.2O.
22. The colored glass article of claim 14, comprising greater than or equal to 0.4 mol % to less than or equal to 0.8 mol % CeO.sub.2.
23. The colored glass article of claim 14, comprising greater than or equal to 0.6 mol % to less than or equal to 1.5 mol % TiO.sub.2.
24. The colored glass article of claim 14, comprising greater than or equal to 0 mol % to less than or equal to 0.1 mol % Fe.sub.2O.sub.3.
25. The colored glass article of claim 14, comprising greater than or equal to 0.1 mol % to less than or equal to 7 mol % Na.sub.2O.
26. The colored glass article of claim 14, comprising greater than or equal to 0.5 mol % to less than or equal to 3 mol % Na.sub.2O.
27. The colored glass article of claim 14, comprising greater than 0 mol % to less than or equal to 3 mol % K.sub.2O.
28. The colored glass article of claim 14, comprising greater than 0 mol % to less than or equal to 0.5 mol % K.sub.2O.
29. The colored glass article of claim 14, comprising wherein Li.sub.2O+Na.sub.2O is greater than or equal to 10 mol % to less than or equal to 19 mol %.
30. The colored glass article of claim 14, comprising greater than 0 mol % to less than or equal to 4.5 mol % MgO.
31. The colored glass article of claim 14, comprising greater than 0 mol % to less than or equal to 5 mol % CaO.
32. The colored glass article of claim 14, comprising greater than 0.05 mol % to less than or equal to 2 mol % CeO.sub.2.
33. The colored glass article of claim 19, comprising greater than or equal to 6 mol % to less than or equal to 14 mol % Li.sub.2O.
34. The colored glass article of claim 19, comprising greater than or equal to 0.4 mol % to less than or equal to 0.8 mol % CeO.sub.2.
35. A colored glass article, comprising: a glass in mole percent on an oxide basis, comprising: greater than or equal to 53 mol % to less than or equal to 66 mol % SiO.sub.2; greater than or equal to 9 mol % to less than or equal to 18 mol % Al.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 15 mol % B.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 3 mol % P.sub.2O.sub.5; greater than 0 mol % to less than or equal to 16 mol % Li.sub.2O; greater than or equal to 0 mol % to less than or equal to 15 mol % Na.sub.2O; greater than or equal to 0 mol % to less than or equal to 5 mol % K.sub.2O; greater than or equal to 0 mol % to less than or equal to 6 mol % MgO; greater than 0 mol % to less than or equal to 6 mol % CaO; greater than or equal to 0 mol % to less than or equal to 3 mol % ZnO; greater than or equal to 0 mol % to less than or equal to 2 mol % TiO.sub.2; greater than or equal to 0 mol % to less than or equal to 2 mol % CeO.sub.2; greater than or equal to 0 mol % to less than or equal to 1 mol % Fe.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 0.5 mol % SnO.sub.2; greater than or equal to 0 mol % to less than or equal to 0.05 mol % SO.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % WO.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % Nb.sub.2O.sub.5; greater than or equal to 0 mol % to less than or equal to 1 mol % Bi.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % MoO.sub.3; and greater than or equal to 0 mol % to less than or equal to 3 mol % La.sub.2O.sub.3; wherein Li.sub.2O+Na.sub.2O is greater than or equal to 8 mol %; wherein the colored glass article has a thickness greater than or equal to 250 μm and less than or equal to 6 mm, wherein the colored glass article is an ion-exchanged colored glass article, wherein the colored glass article comprises a depth of compression greater than or equal to 30 μm, wherein the colored glass article has a surface compressive stress greater than or equal to 300 MPa, wherein the colored glass article has a maximum central tension greater than or equal to 40 MPa; and wherein the colored glass article has a transmittance color coordinate in the CIELAB color space, as measured under F2 illumination and a 10° standard observer angle, of L* greater than or equal to 85 and less than or equal to 98.
36. The colored glass article of claim 35, comprising greater than or equal to 6 mol % to less than or equal to 14 mol % Li.sub.2O.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0010]
[0011]
[0012]
[0013]
[0014]
[0015]
DETAILED DESCRIPTION
[0016] Reference will now be made in detail to various embodiments of glass compositions and colored glass articles formed therefrom having a desired color and suitable for use in high frequency applications. According to embodiments, a glass composition includes greater than or equal to 53 mol % to less than or equal to 66 mol % SiO.sub.2; greater than or equal to 9 mol % to less than or equal to 18 mol % Al.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 15 mol % B.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 3 mol % P.sub.2O.sub.5; greater than or equal to 0 mol % to less than or equal to 16 mol % Li.sub.2O; greater than or equal to 0 mol % to less than or equal to 15 mol % Na.sub.2O; greater than or equal to 0 mol % to less than or equal to 5 mol % K.sub.2O; greater than or equal to 0 mol % to less than or equal to 6 mol % MgO; greater than or equal to 0 mol % to less than or equal to 6 mol % CaO; greater than or equal to 0 mol % to less than or equal to 3 mol % ZnO; greater than or equal to 0 mol % to less than or equal to 2 mol % TiO.sub.2; greater than 0 mol % to less than or equal to 2 mol % CeO.sub.2; greater than or equal to 0 mol % to less than or equal to 1 mol % Fe.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 0.5 mol % SnO.sub.2; greater than or equal to 0 mol % to less than or equal to 0.05 mol % SO.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % WO.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % Nb.sub.2O.sub.5; greater than or equal to 0 mol % to less than or equal to 1 mol % Bi.sub.2O.sub.3; greater than or equal to 0 mol % to less than or equal to 1 mol % MoO.sub.3; and greater than or equal to 0 mol % to less than or equal to 3 mol % La.sub.2O.sub.3; wherein: TiO.sub.2+CeO.sub.2 is greater than or equal to 0.2 mol %; and Li.sub.2O+Na.sub.2O is greater than or equal to 8 mol %. Various embodiments of colored glass articles and methods of making the same will be described herein with specific reference to the appended drawings.
[0017] Ranges may be expressed herein as from “about” one particular value, and/or to “about” another particular value. When such a range is expressed, another embodiment includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent “about,” it will be understood that the particular value forms another embodiment. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint.
[0018] Directional terms as used herein—for example up, down, right, left, front, back, top, bottom—are made only with reference to the figures as drawn and are not intended to imply absolute orientation.
[0019] Unless otherwise expressly stated, it is in no way intended that any method set forth herein be construed as requiring that its steps be performed in a specific order, nor that with any apparatus specific orientations be required. Accordingly, where a method claim does not actually recite an order to be followed by its steps, or that any apparatus claim does not actually recite an order or orientation to individual components, or it is not otherwise specifically stated in the claims or description that the steps are to be limited to a specific order, or that a specific order or orientation to components of an apparatus is not recited, it is in no way intended that an order or orientation be inferred, in any respect. This holds for any possible non-express basis for interpretation, including: matters of logic with respect to arrangement of steps, operational flow, order of components, or orientation of components; plain meaning derived from grammatical organization or punctuation, and; the number or type of embodiments described in the specification.
[0020] As used herein, the singular forms “a,” “an” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a” component includes aspects having two or more such components, unless the context clearly indicates otherwise.
[0021] In the embodiments of the glass compositions and the resultant colored glass articles described herein, the concentrations of constituent components in oxide form (e.g., SiO.sub.2, Al.sub.2O.sub.3, and the like) are specified in mole percent (mol %) on an oxide basis, unless otherwise specified.
[0022] The term “substantially free,” when used to describe the concentration and/or absence of a particular constituent component in a glass composition and the resultant colored glass article, means that the constituent component is not intentionally added to the glass composition and the resultant colored glass article. However, the glass composition and the colored glass article may contain traces of the constituent component as a contaminant or tramp, such as in amounts of less than 0.01 mol %, unless specified otherwise herein.
[0023] The terms “0 mol %” and “free,” when used to describe the concentration and/or absence of a particular constituent component in a glass composition, means that the constituent component is not present in the glass composition.
[0024] Surface compressive stress is measured with a surface stress meter (FSM) such as commercially available instruments such as the FSM-6000, manufactured by Orihara Industrial Co., Ltd. (Japan). Surface stress measurements rely upon the measurement of the stress optical coefficient (SOC), which is related to the birefringence of the glass article. SOC, in turn, is measured according to Procedure C (Glass Disc Method) described in ASTM standard C770-16, entitled “Standard Test Method for Measurement of Glass Stress-Optical Coefficient,” the contents of which are incorporated herein by reference in their entirety. Depth of compression (DOC) is also measured with the FSM. The maximum central tension (CT) values are measured using a scattered light polariscope (SCALP) technique known in the art.
[0025] The term “depth of compression” (DOC), as used herein, refers to the position in the article where compressive stress transitions to tensile stress.
[0026] The term “CIELAB color space,” as used herein, refers to a color space defined by the International Commission on Illumination (CIE) in 1976. It expresses color as three values: L* for the lightness from black (0) to white (100), a* from green (−) to red (+), and B* from blue (−) to yellow (+).
[0027] The term “color gamut,” as used herein, refers to the pallet of colors that may be achieved by the colored glass articles within the CIELAB color space.
[0028] Colorants have been added to conventional aluminosilicate glass compositions to achieve a colored glass article having a desired color and improved mechanical properties. For example, transition metal oxides and/or rare earth oxides may be added. However, simply including colorants in aluminosilicate glass compositions may not produce the desired color and color stability, and/or result in in colored glass articles suitable for use in electronic devices transmitting and/or receiving high frequencies (e.g., frequencies of fifth generation (5G)).
[0029] Disclosed herein are glass compositions and colored glass articles formed therefrom that mitigate the aforementioned problems such that transition metal oxides and/or rare earth oxides may be added to produce colored articles having the desired color and a reduced dielectric constant for use in high frequency applications while retaining the superior ion-exchangeability and drop performance of the colored glass articles. Specifically, the glass compositions disclosed herein include cerium oxides to achieve a desired color and color stability. Moreover, the glass compositions disclosed herein include provide a damage resistance and ion exchange capability that allow use in mobile electronic devices.
[0030] The glass compositions and colored glass articles described herein may be described as aluminosilicate glass compositions and colored glass articles and comprise SiO.sub.2, Al.sub.2O.sub.3, and CeO.sub.2. In addition to SiO.sub.2, Al.sub.2O.sub.3, and CeO.sub.2, the glass compositions and colored glass articles described herein have a minimum content of TiO.sub.2+CeO.sub.2 produce colored glass articles having the desired yellow color. The glass compositions and colored glass articles described herein also include alkali oxides, such as Li.sub.2O, Na.sub.2O, and K.sub.2O, to enable the ion-exchangeability of the colored glass articles.
[0031] The glass compositions described herein are capable of forming colored glass articles with a yellow color. The glass composition also provides desirable color stability throughout various forming processes. The color stability discussed herein refers to changes in color as a result of heat exposure/treatment, with decreased susceptibility to color change with heat exposure being desirable. For example, the glass compositions provide color stability throughout a roll forming and cooling process that may be utilized to form thin glass sheets appropriate for use in mobile electronic devices. The color stability is impacted by both the base glass composition and the colorant package. Glass compositions that do not exhibit the color stability of the glass compositions described herein may be subject to undesired color variability within a single article or across multiple articles within a manufacturing run, rendering the produced glass articles outside of the desired color parameters and reducing yield. The glass compositions described herein may be utilized to form colored glass articles for electronic devices, colored glass articles for electronic appliances, and art glass, among other applications.
[0032] SiO.sub.2 is the primary glass former in the glass compositions described herein and may function to stabilize the network structure of the colored glass articles. The concentration of SiO.sub.2 in the glass compositions and resultant colored glass articles should be sufficiently high (e.g., greater than or equal to 53 mol %) to enhance the chemical durability of the glass composition and, in particular, the resistance of the glass composition to degradation upon exposure to acidic solutions, basic solutions, and in water. The amount of SiO.sub.2 may be limited (e.g., to less than or equal to 66 mol %) to control the melting point of the glass composition, as the melting point of pure SiO.sub.2 or high SiO.sub.2 glasses is undesirably high. Thus, limiting the concentration of SiO.sub.2 may aid in improving the meltability of the glass composition and the formability of the colored glass article.
[0033] In embodiments, the glass composition and the colored glass article may comprise greater than or equal to 53 mol % and less than or equal to 66 mol % SiO.sub.2, such as greater than or equal to 55 mol % and less than or equal to 66 mol % SiO.sub.2, or greater than or equal to 58 mol % and less than or equal to 64 mol % SiO.sub.2. In embodiments, the concentration of SiO.sub.2 in the glass composition and the colored glass article may be greater than or equal to 53 mol %, greater than or equal to 55 mol %, greater than or equal to 57 mol %, greater than or equal to 60 mol %, greater than or equal to 63 mol %, or more. In embodiments, the concentration of SiO.sub.2 in the glass composition and the colored glass article may be less than or equal to 65 mol %, less than or equal to 64 mol %, less than or equal to 63 mol %, or less. In embodiments, the concentration of SiO.sub.2 in the glass composition and the colored glass article may be greater than or equal to 55 mol % and less than or equal to 66 mol %, greater than or equal to 56 mol % and less than or equal to 65 mol %, greater than or equal to 57 mol % and less than or equal to 64 mol %, greater than or equal to 58 mol % and less than or equal to 63 mol %, greater than or equal to 59 mol % and less than or equal to 62 mol %, greater than or equal to 60 mol % and less than or equal to 61 mol %, or any and all sub-ranges formed from any of these endpoints. In embodiments, the concentration of SiO.sub.2 in the glass composition and the colored glass article may be greater than or equal to 58 mol % and less than or equal to 64 mol %.
[0034] Like SiO.sub.2, Al.sub.2O.sub.3 may also stabilize the glass network and additionally provides improved mechanical properties and chemical durability to the glass composition and the colored glass article. The amount of Al.sub.2O.sub.3 may also be tailored to control the viscosity of the glass composition. Al.sub.2O.sub.3 may be included such that the resultant glass composition has the desired fracture toughness. However, if the amount of Al.sub.2O.sub.3 is too high (e.g., greater than 18 mol %), the viscosity of the melt may increase, thereby diminishing the formability of the colored glass article.
[0035] Accordingly, in embodiments, the glass composition and the colored glass article may comprise greater than or equal to 9 mol % and less than or equal to 18 mol % Al.sub.2O.sub.3, such as greater than or equal to 9 mol % and less than or equal to 15 mol % Al.sub.2O.sub.3, or greater than or equal to 14 mol % and less than or equal to 16 mol % Al.sub.2O.sub.3. In embodiments, the concentration of Al.sub.2O.sub.3 in the glass composition and the colored glass article may be greater than or equal to 10 mol %, greater than or equal to 12 mol %, greater than or equal to 13 mol %, greater than or equal to 14 mol %, or more. In embodiments, the concentration of Al.sub.2O.sub.3 in the glass composition and the colored glass article may be less than or equal to 17 mol %, less than or equal to 16 mol %, less than or equal to 15 mol %, less than or equal to 14 mol %, or less. In embodiments, the concentration of Al.sub.2O.sub.3 in the glass composition and the resultant colored glass article may be greater than or equal to 10 mol % and less than or equal to 17 mol %, greater than or equal to 11 mol % and less than or equal to 16 mol % greater than or equal to 12 mol % and less than or equal to 15 mol %, greater than or equal to 13 mol % and less than or equal to 14 mol %, or any and all sub-ranges formed from any of these endpoints.
[0036] B.sub.2O.sub.3 decreases the melting point of the glass composition, which may improve the retention of certain colorants in the glass. B.sub.2O.sub.3 may also improve the damage resistance of the colored glass article. In addition, B.sub.2O.sub.3 is added to reduce the formation of non-bridging oxygen, the presence of which may reduce fracture toughness. The inclusion of B.sub.2O.sub.3 reduces the melting point of the glass composition, improves the formability, and increases the fracture toughness of the colored glass article. However, if B.sub.2O.sub.3 is too high (e.g., greater than 15 mol %), the annealing point and strain point may decrease, which increases stress relaxation and reduces the overall strength of the colored glass article. Lower B.sub.2O.sub.3 contents in the glass composition produce a colored glass article with lighter yellow color (lower b*) but also improve color stability.
[0037] In embodiments, the glass composition and the colored glass article may comprise greater than or equal to 0 mol % and less than or equal to 15 mol % B.sub.2O.sub.3, such as greater than or equal to 1 mol % and less than or equal to 9 mol % B.sub.2O.sub.3, or greater than or equal to 4 mol % and less than or equal to 7 mol % B.sub.2O.sub.3. In embodiments, the concentration of B.sub.2O.sub.3 in the glass composition and the colored glass article may be greater than or equal to 0.1 mol %, greater than or equal to 1 mol %, greater than or equal to 2 mol %, greater than or equal to 3 mol %, greater than or equal to 4 mol %, greater than or equal to 5 mol %, or more. In embodiments, the concentration of B.sub.2O.sub.3 in the glass composition and the colored glass article may be less than or equal to 14 mol %, less than or equal to 13 mol %, less than or equal to 10 mol %, less than or equal to 9 mol %, less than or equal to 7 mol %, or less. In embodiments, the concentration of B.sub.2O.sub.3 in the glass composition and the resultant colored glass article may be greater than or equal to 1 mol % and less than or equal to 14 mol %, greater than or equal to 2 mol % and less than or equal to 13 mol %, greater than or equal to 3 mol % and less than or equal to 12 mol %, greater than or equal to 4 mol % and less than or equal to 11 mol %, greater than or equal to 5 mol % and less than or equal to 10 mol %, greater than or equal to 6 mol % and less than or equal to 9 mol %, greater than or equal to 7 mol % and less than or equal to 8 mol %, or any and all sub-ranges formed from any of these endpoints.
[0038] As described hereinabove, the glass compositions and the colored glass articles may contain alkali oxides, such as Li.sub.2O, Na.sub.2O, and K.sub.2O, to enable the ion-exchangeability of the colored glass articles.
[0039] Li.sub.2O aids in the ion-exchangeability of the colored glass article and also reduces the softening point of the glass composition, thereby increasing the formability of the colored glass articles. Li.sub.2O is also the most beneficial of the alkali metal oxides for the purposes of promoting color stability in the colored glass article. In addition, Li.sub.2O decreases the melting point of the glass composition, which may help improve retention of colorants in the glass. The concentration of Li.sub.2O in the glass compositions and resultant colored glass articles should be sufficiently high to reduce the melting point of the glass composition and achieve the desired maximum central tension. However, if the amount of Li.sub.2O is too high (e.g., greater than 16 mol %), the liquidus temperature may increase, thereby diminishing the manufacturability of the colored glass article.
[0040] In embodiments, the glass composition and the colored glass article may comprise greater than or equal to 0 mol % and less than or equal to 16 mol % Li.sub.2O, such as greater than or equal to 6 mol % and less than or equal to 14 mol % Li.sub.2O, or greater than or equal to 9 mol % and less than or equal to 15 mol % Li.sub.2O. In embodiments, the concentration of Li.sub.2O in the glass composition and the colored glass article may be greater than or equal to 1 mol %, greater than or equal to 5 mol %, greater than or equal to 10 mol %, or more. In embodiments, the concentration of Li.sub.2O in the glass composition and the colored glass article may be less than or equal to 14 mol %, less than or equal to 12 mol %, less than or equal to 10 mol %, or less. In embodiments, the concentration of Li.sub.2O in the glass composition and the resultant colored glass article may be greater than or equal to 0.1 mol % and less than or equal to 15 mol %, greater than or equal to 1 mol % and less than or equal to 14 mol %, greater than or equal to 2 mol % and less than or equal to 13 mol %, greater than or equal to 3 mol % and less than or equal to 12 mol %, greater than or equal to 4 mol % and less than or equal to 11 mol %, greater than or equal to 5 mol % and less than or equal to 10 mol %, greater than or equal to 6 mol % and less than or equal to 9 mol %, greater than or equal to 7 mol % and less than or equal to 8 mol %, or any and all sub-ranges formed from any of these endpoints.
[0041] Na.sub.2O improves diffusivity of alkali ions in the glass and thereby reduces ion-exchange time and helps achieve the desired surface compressive stress (e.g., greater than or equal to 300 MPa). Na.sub.2O also improves formability of the colored glass article. In addition, Na.sub.2O decreases the melting point of the glass composition, which may help improve colorant retention. However, if too much Na.sub.2O is added to the glass composition, the melting point may be too low. As such, in embodiments, the concentration of Li.sub.2O present in the glass composition and the colored glass article may be greater than the concentration of Na.sub.2O present in the glass composition and the colored glass article.
[0042] In embodiments, the glass composition and the colored glass article may comprise greater than or equal to 0 mol % and less than or equal to 15 mol % Na.sub.2O, such as greater than or equal to 0.1 mol % and less than or equal to 7 mol % Na.sub.2O, or greater than or equal to 0.1 mol % and less than or equal to 2 mol % Na.sub.2O. In embodiments, the concentration ofNa.sub.2O in the glass composition and the colored glass article may be greater than 0 mol %, greater than or equal to 0.1 mol %, greater than or equal to 0.5 mol %, greater than or equal to 1 mol %, or more. In embodiments, the concentration of Na.sub.2O in the glass composition and the colored glass article may be less than or equal to 12 mol %, less than or equal to 10 mol %, less than or equal to 8 mol %, less than or equal to 6 mol %, less than or equal to 4 mol %, less than or equal to 3 mol %, or less. In embodiments, the concentration of Na.sub.2O in the glass composition and the resultant colored glass article may be greater than 0 mol % and less than or equal to 14 mol %, greater than or equal to 0.1 mol % and less than or equal to 13 mol %, greater than or equal to 0.5 mol % and less than or equal to 12 mol %, greater than or equal to 1 mol % and less than or equal to 11 mol %, greater than or equal to 2 mol % and less than or equal to 10 mol %, greater than or equal to 3 mol % and less than or equal to 9 mol %, greater than or equal to 4 mol % and less than or equal to 8 mol %, greater than or equal to 5 mol % and less than or equal to 7 mol %, greater than or equal to 2 mol % and less than or equal to 6 mol %, or any and all sub-ranges formed from any of these endpoints.
[0043] K.sub.2O promotes ion-exchange and may increase the depth of compression and decrease the melting point to improve the formability of the colored glass article. However, adding too much K.sub.2O may cause the surface compressive stress and melting point to be too low. K.sub.2O may also negatively impact the color stability of the colored glass article. Accordingly, in embodiments, the amount of K.sub.2O added to the glass composition may be limited.
[0044] In embodiments, the glass composition and the colored glass article may comprise greater than or equal to 0 mol % and less than or equal to 5 mol % K.sub.2O, such as greater than or equal to 0 mol % and less than or equal to 3 mol % K.sub.2O, or greater than or equal to 0 mol % and less than or equal to 0.5 mol % K.sub.2O. In embodiments, the concentration of K.sub.2O in the glass composition and the colored glass article may be greater than 0 mol %, greater than or equal to 0.1 mol %, greater than or equal to 0.2 mol %, or more. In embodiments, the concentration of K.sub.2O in the glass composition and the colored glass article may be less than or equal to 1 mol %, less than or equal to 0.7 mol %, less than or equal to 0.5 mol %, or less. In embodiments, the concentration of K.sub.2O in the glass composition and the resultant colored glass article may be greater than 0 mol % and less than or equal to 4 mol %, greater than or equal to 0.1 mol % and less than or equal to 3 mol %, greater than or equal to 0.2 mol % and less than or equal to 2 mol %, greater than or equal to 0.5 mol % and less than or equal to 1 mol %, or any and all sub-ranges formed from any of these endpoints.
[0045] R.sub.2O is the sum (in mol %) of Li.sub.2O, Na.sub.2O, and K.sub.2O present in the glass composition and the colored glass article (i.e., R.sub.2O=Li.sub.2O (mol %)+Na.sub.2O (mol %)+K.sub.2O (mol %). Like B.sub.2O.sub.3, the alkali oxides aid in decreasing the softening point and molding temperature of the glass composition, thereby offsetting the increase in the softening point and molding temperature of the glass composition due to higher amounts of SiO.sub.2 in the glass composition, for example. The softening point and molding temperature may be further reduced by including combinations of alkali oxides (e.g., two or more alkali oxides) in the glass composition, a phenomenon referred to as the “mixed alkali effect.” However, it has been found that if the amount of R.sub.2O is too high, the average coefficient of thermal expansion of the glass composition increases to greater than 100×10.sup.−7C, which may be undesirable.
[0046] In embodiments, the concentration of R.sub.2O in the glass composition and the colored glass article may be greater than or equal to 10 mol %, greater than or equal to 12 mol %, greater than 14 mol %, greater than or equal to 16 mol %, or more. In embodiments, the concentration of R.sub.2O in the glass composition and the colored glass article may be less than or equal to 19 mol %, less than or equal to 18 mol %, less than or equal to 15 mol %, less than or equal to 13 mol %, or less. In embodiments, the concentration of R.sub.2O in the glass composition and the colored glass article may be greater than or equal to 10 mol % and less than or equal to 19 mol %, greater than or equal to 11 mol % and less than or equal to 18 mol %, greater than or equal to 12 mol % and less than or equal to 17 mol %, greater than or equal to 13 mol % and less than or equal to 16 mol %, greater than or equal to 14 mol % and less than or equal to 15 mol %, or any and all sub-ranges formed from any of these endpoints.
[0047] The concentration of Li.sub.2O+Na.sub.2O in the glass composition and the colored glass article determines the ability of the glass composition and the colored glass article to be strengthened through an ion exchange process. Generally, the ion exchange process strengthens the glass by replacing alkali ions in the glass with larger alkali ions. For example, a glass containing Li.sub.2O and/or Na.sub.2O may be strengthened by ion exchange such that potassium ions (K.sup.+) replace the Li.sup.+ or Na.sup.+ ions in the glass. In this manner, the ability of the colored glass article to be strengthened by an ion exchange process relates directly to the content of Li.sub.2O+Na.sub.2O, and if the Li.sub.2O+Na.sub.2O content is too low (e.g., less than about 8 mol %) the colored glass article may not be able to be sufficiently strengthened by ion exchange processes.
[0048] In embodiments, the concentration of Li.sub.2O+Na.sub.2O in the glass composition and the colored glass article is greater than or equal to than or equal to 8 mol %, such as greater than or equal to 10 mol % and less than or equal to than or equal to 19 mol %. In embodiments, the concentration of Li.sub.2O+Na.sub.2O in the glass composition and the colored glass article is greater than or equal to than or equal to 9 mol %, greater than or equal to 10 mol %, greater than or equal to 12 mol %, greater than or equal to 14 mol %, greater than or equal to 16 mol %, or more. In embodiments, the concentration of Li.sub.2O+Na.sub.2O in the glass composition and the colored glass article is less than or equal to than or equal to 20 mol %, less than or equal to than or equal to 18 mol %, less than or equal to than or equal to 16 mol %, less than or equal to than or equal to 14 mol %, less than or equal to than or equal to 12 mol %, less than or equal to than or equal to 10 mol %, or less. In embodiments, the concentration of Li.sub.2O+Na.sub.2O in the glass composition and the colored glass article is greater than or equal to 8 mol % and less than or equal to than or equal to 20 mol %, greater than or equal to 9 mol % and less than or equal to than or equal to 19 mol %, greater than or equal to 10 mol % and less than or equal to than or equal to 18 mol %, greater than or equal to 11 mol % and less than or equal to than or equal to 17 mol %, greater than or equal to 12 mol % and less than or equal to than or equal to 16 mol %, greater than or equal to 13 mol % and less than or equal to than or equal to 15 mol %, greater than or equal to 8 mol % and less than or equal to than or equal to 14 mol %, or any and all sub-ranges formed from any of these endpoints.
[0049] In embodiments, the glass compositions and the colored glass articles described herein may further comprise P.sub.2O.sub.5. P.sub.2O.sub.5 may increase the ion exchange rate of the colored glass articles, allowing the desired strengthening and stress profile to be achieved in a reduced time. In embodiments, the concentration of P.sub.2O.sub.5 in the glass composition and the colored glass article may be greater than or equal to 0 mol % and less than or equal to 3 mol %, greater than or equal to 0.1 mol % and less than or equal to 2 mol %, greater than or equal to 0 mol % and less than or equal to 1 mol %, or any and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of P.sub.2O.sub.5.
[0050] In embodiments, the difference between R.sub.2O and Al.sub.2O.sub.3(i.e. R.sub.2O (mol %)— Al.sub.2O.sub.3(mol %)) in the glass composition may be adjusted to reduce the formation of non-bridging oxygen, the presence of which may reduce fracture toughness. Decreasing the amount of R.sub.2O—Al.sub.2O.sub.3 in the glass composition while maintaining the Al.sub.2O.sub.3content at a fixed value produces a lighter yellow color (lower b* value) but improved color stability. For this reason, it may be desirable to utilize a higher R.sub.2O value and lower Al.sub.2O.sub.3content, optionally with an increased SiO.sub.2 content, that allows the achievement of a greater yellow colors (greater b*) and improved color stability. In embodiments, R.sub.2O— Al.sub.2O.sub.3 in the glass composition and the colored glass article may be greater than or equal to −7 mol %, greater than or equal to −6 mol %, greater than or equal to −5 mol %, greater than or equal to −4 mol %, greater than or equal to −3 mol %, greater than or equal to −2 mol %, greater than or equal to −1 mol %, greater than or equal to 0 mol %, greater than or equal to 1 mol %, greater than or equal to 2 mol %, greater than or equal to 3 mol %, or more. In embodiments, R.sub.2O— Al.sub.2O.sub.3 in the glass composition and the colored glass article may be less than or equal to 4 mol %, less than or equal to 3 mol %, less than or equal to 2 mol %, less than or equal to 1 mol %, less than or equal to 0 mol %, or less. In embodiments, R.sub.2O— Al.sub.2O.sub.3 in the glass composition and the resultant colored glass article may be greater than or equal to −7 mol % and less than or equal to 4 mol %, greater than or equal to −6 mol % and less than or equal to 3 mol %, greater than or equal to −5 mol % and less than or equal to 2 mol %, greater than or equal to −4 mol % and less than or equal to 1 mol %, greater than or equal to −3 mol % and less than or equal to 0 mol %, greater than or equal to −2 mol % and less than or equal to −1 mol %, or any and all sub-ranges formed from any of these endpoints.
[0051] In embodiments, the glass compositions and the colored glass articles described herein may further comprise MgO. MgO lowers the viscosity of the glass compositions, which enhances the formability, the strain point, and the Young's modulus, and may improve ion-exchangeability. However, when too much MgO is added to the glass composition, the diffusivity of sodium and potassium ions in the glass composition decreases which, in turn, adversely impacts the ion-exchange performance (i.e., the ability to ion-exchange) of the colored glass article. MgO promotes color stability of the colored glass article, with the effect less pronounced than that of CaO but greater than ZnO.
[0052] In embodiments, the glass composition and the colored glass article may comprise greater than or equal to 0 mol % and less than or equal to 6 mol % MgO, such as greater than or equal to 0 mol % and less than or equal to 5 mol % MgO, or greater than or equal to 2 mol % and less than or equal to 4.5 mol % MgO. In embodiments, the concentration of MgO in the glass composition may be greater than or equal to 0 mol %, greater than or equal to 0.1 mol %, greater than or equal to 0.5 mol %, greater than or equal to 1 mol %, greater than or equal to 2 mol %, or more. In embodiments, the concentration of MgO in the glass composition may be less than or equal to 6 mol %, less than or equal to 5 mol %, less than or equal to 4 mol %, less than or equal to 3 mol %, or less. In embodiments, the concentration of MgO in the glass composition may be greater than or equal to 0 mol % and less than or equal to 6 mol %, greater than 0 mol % and less than or equal to 5 mol %, greater than or equal to 0.1 mol % and less than or equal to 4 mol %, greater than or equal to 0.5 mol % and less than or equal to 3 mol %, greater than or equal to 1 mol % and less than or equal to 2 mol %, or any and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of MgO.
[0053] In embodiments, the glass compositions and the colored glass articles described herein may further comprise CaO. CaO lowers the viscosity of a glass composition, which enhances the formability, the strain point and the Young's modulus, and may improve the ion-exchangeability. However, when too much CaO is added to the glass composition, the diffusivity of sodium and potassium ions in the glass composition decreases which, in turn, adversely impacts the ion-exchange performance (i.e., the ability to ion-exchange) of the resultant glass. CaO promotes color stability in the colored glass article, and is the most preferred among the R′O components for the purposes of promoting color stability
[0054] In embodiments, the concentration of CaO in the glass composition and the colored glass article may be greater than or equal to 0 mol % and less than or equal to 6 mol %, such as greater than or equal to 0 mol % and less than or equal to 5 mol %, or greater than or equal to 0 mol % and less than or equal to 4.5 mol %. In embodiments, the concentration of CaO in the glass composition and the colored glass article may be greater than or equal to 0 mol %, greater than 0 mol %, greater than or equal to 0.1 mol %, greater than or equal to 0.5 mol %, greater than or equal to 1 mol %, or more. In embodiments, the concentration of CaO in the glass composition and the colored glass article may be less than or equal to 6 mol %, less than or equal to 5 mol %, less than or equal to 4 mol %, less than or equal to 3 mol %, less than or equal to 2 mol %, or less. In embodiments, the concentration of CaO in the glass composition and the resultant colored glass article may be greater than or equal to 0 mol % and less than or equal to 6 mol %, greater than 0 mol % and less than or equal to 5 mol %, greater than or equal to 0.1 mol % and less than or equal to 4 mol %, greater than or equal to 0.5 mol % and less than or equal to 3 mol %, greater than or equal to 1 mol % and less than or equal to 2 mol %, or any and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of CaO.
[0055] In embodiments, the glass compositions and the colored glass articles described herein may further comprise ZnO. ZnO lowers the viscosity of the glass compositions, which enhances the formability, the strain point, and the Young's modulus, and may improve ion-exchangeability. However, when too much ZnO is added to the glass composition, the diffusivity of sodium and potassium ions in the glass composition decreases which, in turn, adversely impacts the ion-exchange performance (i.e., the ability to ion-exchange) of the colored glass article. In contrast to other R′O components, ZnO does not significantly affect the color stability of the colored glass article.
[0056] In embodiments, the glass composition and the colored glass article may comprise greater than or equal to 0 mol % and less than or equal to 3 mol % ZnO, such as greater than or equal to 0 mol % and less than or equal to 2 mol % ZnO. In embodiments, the concentration of ZnO in the glass composition may be greater than or equal to 0 mol %, greater than 0 mol %, greater than or equal to 0.1 mol %, greater than or equal to 0.5 mol %, greater than or equal to 1 mol %, greater than or equal to 2 mol %, or more. In embodiments, the concentration of ZnO in the glass composition may be less than or equal to 3 mol %, less than or equal to 2 mol %, less than or equal to 1 mol %, or less. In embodiments, the concentration of ZnO in the glass composition may be greater than or equal to 0 mol % and less than or equal to 3 mol %, greater than 0 mol % and less than or equal to 2 mol %, greater than or equal to 0.1 mol % and less than or equal to 1 mol %, or any and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of ZnO.
[0057] R′O is the sum (in mol %) of CaO, MgO, and ZnO present in the glass composition and the colored glass article (i.e., R′O=CaO (mol %)+MgO (mol %)+ZnO (mol %)). The content of R′O correlates to the color stability of the article, with color stability decreasing with decreasing R′O contents. In embodiments, the concentration of R′O in the glass composition and the colored glass article may be greater than or equal 3 mol %, greater than or equal to 4 mol %, greater than or equal to 5 mol %, greater than or equal to 6 mol %, greater than or equal to 7 mol %, or more. In embodiments, the concentration of R′O in the glass composition and the colored glass article may be less than or equal to 8 mol %, less than or equal to 7 mol %, less than or equal to 6.5 mol %, less than or equal to 6 mol %, less than or equal to 5 mol %, less than or equal to 4 mol %, or less. In embodiments, the concentration of R′O in the glass composition and the colored glass article may be greater than or equal to 3 mol % and less than or equal to 8 mol %, greater than or equal to 3 mol % and less than or equal to 7 mol %, greater than or equal to 4 mol % and less than or equal to 6.5 mol %, greater than or equal to 5 mol % and less than or equal to 6 mol %, or any and all sub-ranged formed from any of these endpoints.
[0058] The glass compositions and the colored glass articles described herein may further comprise Fe.sub.2O.sub.3, which may help improve colorant retention and color stability. The inclusion of Fe.sub.2O.sub.3 improves the color stability without impacting the target color, if included in appropriate amounts. Without wishing to be bound by any particular theory, Fe.sub.2O.sub.3 may prevent the conversion of Ti.sup.4+ to Ti.sup.3+ in glasses that contain CeO.sub.2 during extended exposure to heat, preventing a color shift associated with the change in the oxidation state of titanium. In embodiments, the concentration of Fe.sub.2O.sub.3 in the glass composition may be greater than or equal to 0 mol %, greater than 0 mol %, greater than or equal to 0.001 mol %, greater than or equal to 0.01 mol %, or more. In embodiments, the concentration of Fe.sub.2O.sub.3 in the glass composition may be less than or equal to 1 mol %, less than or equal to 0.5 mol %, less than or equal to 0.1 mol %, or less. In embodiments, the concentration of Fe.sub.2O.sub.3 in the glass composition may be greater than or equal to 0 mol % and less than or equal to 1 mol %, greater than 0 mol % and less than or equal to 0.5 mol %, greater than or equal to 0.001 mol % and less than or equal to 0.1 mol %, greater than or equal to 0.01 mol % and less than or equal to 0.1 mol %, or any and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of Fe.sub.2O.sub.3.
[0059] The glass compositions and the colored glass articles described herein may further comprise SnO.sub.2. The SnO.sub.2 in the glass compositions may be added as a fining agent. SnO.sub.2 may also be present in the glass composition as a product of tin electrode decomposition during the melting process. SnO.sub.2 contents in the glass composition above 0.05 mol % may negatively impact the color stability of colored glass articles with b* values over 0.5. In embodiments, the concentration of SnO.sub.2 in the glass composition and the colored glass article may be greater than or equal to 0 mol %, greater than or equal to 0.01 mol %, or more. In embodiments, the concentration of SnO.sub.2 in the glass composition and the colored glass article may be less than or equal to 0.5 mol %, less than or equal to 0.2 mol %, less than or equal to 0.1 mol %, or less. In embodiments, the concentration of SnO.sub.2 in the glass composition and the resultant colored glass article may be greater than or equal to 0 mol % and less than or equal to 0.5 mol %, greater than 0 mol % and less than or equal to 0.5 mol %, greater than or equal to 0.001 mol % and less than or equal to 0.5 mol %, greater than or equal to 0.01 mol % and less than or equal to 0.2 mol %, greater than or equal to 0 mol % and less than or equal to 0.05 mol %, or any and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of SnO.sub.2.
[0060] The glass compositions and the colored glass articles described herein may further comprise SO.sub.3 as a fining agent. SO.sub.3 may be utilized as a fining agent without impacting the color or color stability of the colored glass article. In embodiments, the concentration of SO.sub.3 in the glass composition and the colored glass article may be greater than or equal to 0 mol % to less than or equal to 0.05 mol %, greater than or equal to 0.001 mol % to less than or equal to 0.05 mol %, or any and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of SO.sub.3.
[0061] In embodiments, the glass compositions and the colored glass articles include a colorant package to achieve a desired color. The colorant package includes CeO.sub.2, as the sole colorant or in combination with other colorants. In embodiments, the colorant package may include TiO.sub.2 in addition to CeO.sub.2, with the total amount of TiO.sub.2+CeO.sub.2 being sufficiently high to provide the desired color. Additional colorants in the color package may include WO.sub.3, Nb.sub.2O.sub.5, Bi.sub.2O.sub.3, MoO.sub.3, La.sub.2O.sub.3, and/or combinations thereof. In general, increasing colorant package concentrations are associated with a decrease in color stability of the colored glass article.
[0062] The glass composition and the colored glass article comprise greater than 0 mol % CeO.sub.2 to provide the desired yellow color. In embodiments, the concentration of CeO.sub.2 in the glass composition and the colored glass article may be greater than 0 mol % and less than or equal to 2 mol %, such as greater than or equal to 0.05 mol % and less than or equal to 2 mol %, greater than or equal to 0.4 mol % and less than or equal to 0.8 mol %, greater than or equal to 0.1 mol % and less than or equal to 1.9 mol %, greater than or equal to 0.2 mol % and less than or equal to 1.8 mol %, greater than or equal to 0.3 mol % and less than or equal to 1.7 mol %, greater than or equal to 0.4 mol % and less than or equal to 1.6 mol %, greater than or equal to 0.5 mol % and less than or equal to 1.5 mol %, greater than or equal to 0.6 mol % and less than or equal to 1.4 mol %, greater than or equal to 0.7 mol % and less than or equal to 1.3 mol %, greater than or equal to 0.8 mol % and less than or equal to 1.2 mol %, greater than or equal to 0.9 mol % and less than or equal to 1.1 mol %, greater than or equal to 0.01 mol % and less than or equal to 1 mol %, or any and all sub-ranges formed from any of these endpoints.
[0063] The glass composition and the colored glass article may include TiO.sub.2 to provide the desired yellow color. In embodiments, the concentration of TiO.sub.2 in the glass composition and the colored glass article may be greater than or equal to 0 mol % and less than or equal to 2 mol %, such as greater than or equal to 0.6 mol % and less than or equal to 1.5 mol %, greater than 0 mol % and less than or equal to 2 mol %, greater than or equal to 0.1 mol % and less than or equal to 1.9 mol %, greater than or equal to 0.2 mol % and less than or equal to 1.8 mol %, greater than or equal to 0.3 mol % and less than or equal to 1.7 mol %, greater than or equal to 0.4 mol % and less than or equal to 1.6 mol %, greater than or equal to 0.5 mol % and less than or equal to 1.5 mol %, greater than or equal to 0.6 mol % and less than or equal to 1.4 mol %, greater than or equal to 0.7 mol % and less than or equal to 1.3 mol %, greater than or equal to 0.8 mol % and less than or equal to 1.2 mol %, greater than or equal to 0.9 mol % and less than or equal to 1.1 mol %, greater than or equal to 0.01 mol % and less than or equal to 1 mol %, or any and all sub-ranges formed from any of these endpoints.
[0064] The glass composition and the colored glass article include sufficient TiO.sub.2+CeO.sub.2 to provide the desired yellow color. In embodiments, the concentration of TiO.sub.2+CeO.sub.2 in the glass composition and the colored glass article is greater than or equal to 0.2 mol %, greater than or equal to 0.3 mol %, greater than or equal to 0.4 mol %, greater than or equal to 0.5 mol %, greater than or equal to 0.6 mol %, greater than or equal to 0.7 mol %, greater than or equal to 0.8 mol %, or more. In embodiments, the concentration of TiO.sub.2+CeO.sub.2 in the glass composition and the colored glass article may be less than or equal to 3 mol %, less than or equal to 2.5 mol %, less than or equal to 2 mol %, less than or equal to 1.5 mol %, less than or equal to 1 mol %, or less. In embodiments, the concentration of TiO.sub.2+CeO.sub.2 in the glass composition and the colored glass article may be greater than or equal to 0.2 mol % and less than or equal to 3 mol %, such as greater than or equal to 0.3 mol % and less than or equal to 2.5 mol %, greater than or equal to 0.4 mol % and less than or equal to 2 mol %, greater than or equal to 0.5 mol % and less than or equal to 2.0 mol %, greater than or equal to 0.5 mol % and less than or equal to 1.5 mol %, greater than or equal to 0.6 mol % and less than or equal to 1 mol %, greater than or equal to 0.7 mol % and less than or equal to 0.9 mol %, greater than or equal to 0.8 mol % and less than or equal to 1.5 mol %, or any and all sub-ranges formed from any of these endpoints.
[0065] The glass composition and the colored glass article may comprise WO.sub.3 as an additional component in the color package for the purposes of achieving the desired yellow color. In embodiments, the concentration of WO.sub.3 in the glass composition and the resultant colored glass article may be greater than or equal to 0 mol % and less than or equal to 1 mol %, such as greater than or equal to 0 mol % and less than or equal to 0.5 mol %, greater than 0 mol % and less than or equal to 0.1 mol %, greater than or equal to 0.001 mol % and less than or equal to 0.01 mol %, and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of WO.sub.3.
[0066] The glass composition and the colored glass article may comprise Nb.sub.2O.sub.5 as an additional component in the color package for the purposes of achieving the desired yellow color. In embodiments, the concentration of Nb.sub.2O.sub.5 in the glass composition and the resultant colored glass article may be greater than or equal to 0 mol % and less than or equal to 1 mol %, such as greater than or equal to 0 mol % and less than or equal to 0.5 mol %, greater than 0 mol % and less than or equal to 0.1 mol %, greater than or equal to 0.001 mol % and less than or equal to 0.01 mol %, and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of Nb.sub.2O.sub.5.
[0067] The glass composition and the colored glass article may comprise Bi.sub.2O.sub.3 as an additional component in the color package for the purposes of achieving the desired yellow color. In embodiments, the concentration of Bi.sub.2O.sub.3 in the glass composition and the resultant colored glass article may be greater than or equal to 0 mol % and less than or equal to 1 mol %, such as greater than or equal to 0 mol % and less than or equal to 0.5 mol %, greater than 0 mol % and less than or equal to 0.1 mol %, greater than or equal to 0.001 mol % and less than or equal to 0.01 mol %, and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of Bi.sub.2O.sub.3.
[0068] The glass composition and the colored glass article may comprise MoO.sub.3 as an additional component in the color package for the purposes of achieving the desired yellow color. In embodiments, the concentration of MoO.sub.3 in the glass composition and the resultant colored glass article may be greater than or equal to 0 mol % and less than or equal to 1 mol %, such as greater than or equal to 0 mol % and less than or equal to 0.5 mol %, greater than 0 mol % and less than or equal to 0.1 mol %, greater than or equal to 0.001 mol % and less than or equal to 0.01 mol %, and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of MoO.sub.3.
[0069] The glass composition and the colored glass article may comprise La.sub.2O.sub.3 as an additional component in the color package for the purposes of achieving the desired yellow color. In embodiments, the concentration of La.sub.2O.sub.3 in the glass composition and the resultant colored glass article may be greater than or equal to 0 mol % and less than or equal to 3 mol %, such as greater than or equal to 0 mol % and less than or equal to 2 mol %, greater than 0 mol % and less than or equal to 1 mol %, greater than or equal to 0.001 mol % and less than or equal to 0.1 mol %, and all sub-ranges formed from any of these endpoints. In embodiments, the glass composition and the colored glass article may be substantially free or free of La.sub.2O.sub.3.
[0070] The glass compositions described herein may be formed into a colored glass article by any appropriate forming process. In embodiments, the glass compositions are formed into a colored glass article by a roll forming process. The roll forming process may include rolling the glass composition to form a rolled glass article, and then cooling the rolled glass article to form a colored glass article. The glass compositions described herein are especially suitable for roll forming processes due to the increased color stability provided by the glass compositions, enabling increased color uniformity within the colored glass article and across many colored glass articles in a manufacturing run. The color stability of the glass compositions described herein increases the yield of roll forming processes for the production of colored glass articles. In particular, roll forming processes with quenching times in the range of 30 seconds to 200 seconds do not produce color variation for the glass compositions described herein.
[0071] The glass compositions described herein may be melted utilizing any appropriate process. The melting temperature has not shown any significant impact on the color of the colored glass article, at least across the range of temperatures from the liquidus temperature of the glass composition up to 1650° C. Where a tin electrode is utilized in the melting process, the melting temperature may impact the color of the colored glass article because higher temperatures produce greater tin electrode wear and higher SnO.sub.2 contents in the colored glass article, which reduces the yellow appearance of the colored glass article. The melting atmosphere may impact the color of the colored glass article. A reducing atmosphere, such as that produced by a gas/oxy furnace, produces a colored glass article that appears less yellow (lower b*) than the same glass composition melted in an electric furnace. The material of the melting vessel may also impact the color of the colored glass article, with colored glass articles melted in Rh containing vessels are slightly yellower or darker than the same glass composition melted in Pt vessels due to the leaching of Rh into the glass, but the presence of Rh in the glass was not found to impact the color stability of the colored glass articles.
[0072] In embodiments, the process for making a glass article may include heat treating a glass composition described herein at one or more preselected temperatures for one or more preselected times to induce glass homogenization. In embodiments, the heat treatment for making a glass article may include (i) heating a glass composition at a rate of 1-100° C./min to glass homogenization temperature; (ii) maintaining the glass composition at the glass homogenization temperature for a time greater than or equal to 0.25 hour and less than or equal to 4 hours to produce a glass article; and (iii) cooling the formed glass article to room temperature. In embodiments, the glass homogenization temperature may be greater than or equal to 300° C. and less than or equal to 700° C. In embodiments, the formed glass article may be a colored glass article such that additional heat treatment is not necessary.
[0073] The colored glass articles formed from the glass compositions described herein may be any suitable thickness, which may vary depending on the particular application of the colored glass article. In embodiments, the colored glass articles may have a thickness greater than or equal to 250 μm and less than or equal to 6 mm, greater than or equal to 250 μm and less than or equal to 4 mm, greater than or equal to 250 μm and less than or equal to 2 mm, greater than or equal to 250 μm and less than or equal to 1 mm, greater than or equal to 250 μm and less than or equal to 750 μm, greater than or equal to 250 μm and less than or equal to 500 μm, greater than or equal to 500 μm and less than or equal to 6 mm, greater than or equal to 500 μm and less than or equal to 4 mm, greater than or equal to 500 μm and less than or equal to 2 mm, greater than or equal to 500 μm and less than or equal to 1 mm, greater than or equal to 500 μm and less than or equal to 750 μm, greater than or equal to 750 μm and less than or equal to 6 mm, greater than or equal to 750 μm and less than or equal to 4 mm, greater than or equal to 750 μm and less than or equal to 2 mm, greater than or equal to 750 μm and less than or equal to 1 mm, greater than or equal to 1 mm and less than or equal to 6 mm, greater than or equal to 1 mm and less than or equal to 4 mm, greater than or equal to 1 mm and less than or equal to 2 mm, greater than or equal to 2 mm and less than or equal to 6 mm, greater than or equal to 2 mm and less than or equal to 4 mm, or even greater than or equal to 4 mm and less than or equal to 6 mm, or any and all sub-ranges formed from any of these endpoints.
[0074] As discussed hereinabove, colored glass articles formed from the glass compositions described herein may have an increased fracture toughness such that the colored glass articles are more resistant to damage. In embodiments, the colored glass article may have a Kw fracture toughness as measured by a chevron notch short bar method greater than or equal to 0.7 MPa.Math.m.sup.1/2, greater than or equal to 0.8 MPa.Math.m.sup.1/2, greater than or equal to 0.9 MPa.Math.m.sup.1/2 or even greater than or equal to 1.0 MPa.Math.m.sup.1/2.
[0075] In embodiments, the glass compositions described herein are ion-exchangeable to facilitate strengthening the colored glass article made from the glass compositions. In typical ion-exchange processes, smaller metal ions in the glass compositions are replaced or “exchanged” with larger metal ions of the same valence within a layer that is close to the outer surface of the colored glass article made from the glass composition. The replacement of smaller ions with larger ions creates a compressive stress within the layer of the colored glass article made from the glass composition. In embodiments, the metal ions are monovalent metal ions (e.g., Lit, Nat, K+, and the like), and ion-exchange is accomplished by immersing the glass article made from the glass composition in a bath comprising at least one molten salt of the larger metal ion that is to replace the smaller metal ion in the colored glass article. Alternatively, other monovalent ions such as Ag.sup.+, Tl.sup.+, Cu.sup.+, and the like may be exchanged for monovalent ions. The ion-exchange process or processes that are used to strengthen the colored glass article made from the glass composition may include contacting the colored glass article with an ion-exchange medium. In embodiments, the ion-exchange medium may be a molten salt bath. For example, the ion-exchange process may include, but is not limited to, immersion in a single bath or multiple baths of like or different compositions with optional washing and/or annealing steps between immersions.
[0076] Upon exposure to the colored glass article, the ion-exchange solution (e.g., KNO.sub.3 and/or NaNO.sub.3 molten salt bath) may, according to embodiments, be at a temperature greater than or equal to 350° C. and less than or equal to 500° C., greater than or equal to 360° C. and less than or equal to 450° C., greater than or equal to 370° C. and less than or equal to 440° C., greater than or equal to 360° C. and less than or equal to 420° C., greater than or equal to 370° C. and less than or equal to 400° C., greater than or equal to 375° C. and less than or equal to 475° C., greater than or equal to 400° C. and less than or equal to 500° C., greater than or equal to 410° C. and less than or equal to 490° C., greater than or equal to 420° C. and less than or equal to 480° C., greater than or equal to 430° C. and less than or equal to 470° C., or even greater than or equal to 440° C. and less than or equal to 460° C., or any and all sub-ranges between the foregoing values. In embodiments, the colored glass article may be exposed to the ion-exchange solution for a duration greater than or equal to 2 hours and less than or equal to 24 hours, greater than or equal to 2 hours and less than or equal to 12 hours, greater than or equal to 2 hours and less than or equal to 6 hours, greater than or equal to 8 hours and less than or equal to 24 hours, greater than or equal to 6 hours and less than or equal to 24 hours, greater than or equal to 6 hours and less than or equal to 12 hours, greater than or equal to 8 hours and less than or equal to 24 hours, or even greater than or equal to 8 hours and less than or equal to 12 hours, or any and all sub-ranges formed from any of these endpoints.
[0077] In embodiments, a colored glass article made from a glass composition may be ion-exchanged to achieve a depth of compression of greater than or equal to 30 μm, greater than or equal to 40 μm, greater than or equal to 50 μm, greater than or equal to 60 μm, greater than or equal to 70 μm, greater than or equal to 80 μm, greater than or equal to 90 μm, greater than or equal to 100 μm, or more. In embodiments, the colored glass article made from the glass composition may have a thickness “t” and may be ion-exchanged to achieve a depth of compression greater than or equal to 0.1t, greater than or equal to 0.15t, greater than or equal to 0.2t, or more. In embodiments, the colored glass article made from the glass composition described herein may have a thickness “t” and may be ion-exchanged to achieve a depth of compression greater than or equal to 0.1t and less than or equal to 0.3t, greater than or equal to 0.15t and less than or equal to 0.25t, or any and all sub-ranges formed from any of these endpoints.
[0078] The development of this surface compression layer is beneficial for achieving a better crack resistance and higher flexural strength compared to non-ion-exchanged materials. The surface compression layer has a higher concentration of the ions exchanged into the colored glass article in comparison to the concentration of the ions exchanged into the colored glass article for the body (i.e., the area not including the surface compression) of the colored glass article. In embodiments, the colored glass article made from the glass composition may have a surface compressive stress after ion-exchange strengthening greater than or equal to 300 MPa, greater than or equal to 400 MPa, greater than or equal to 500 MPa, greater than or equal to 600 MPa, or more. In embodiments, the colored glass article made from the glass composition may have a surface compressive stress after ion-exchange strengthening greater than or equal to 300 MPa and less than or equal to 1.5 GPa, greater than or equal to 300 MPa and less than or equal to 1 GPa, greater than or equal to 400 MPa and less than or equal to 900 MPa, greater than or equal to 500 MPa and less than or equal to 800 MPa, greater than or equal to 600 MPa and less than or equal to 700 MPa, or any and all sub-ranges formed from any of these endpoints.
[0079] In embodiments, the colored glass articles made from the glass composition may have a central tension after ion-exchange strengthening greater than or equal to 40 MPa, greater than or equal to 60 MPa, greater than or equal to 80 MPa, greater than or equal to 100 MPa, or more. In embodiments, the colored glass article made from the glass composition may have a central tension after ion-exchange strengthening less than or equal to 250 MPa, less than or equal to 200 MPa, less than or equal to 150 MPa, or less. In embodiments, the colored glass article made from the glass composition may have a central tension after ion-exchange strengthening greater than or equal to 40 MPa and less than or equal to 250 MPa, greater than or equal to 40 MPa and less than or equal to 200 MPa, greater than or equal to 40 MPa and less than or equal to 150 MPa, greater than or equal to 60 MPa and less than or equal to 250 MPa, greater than or equal to 60 MPa and less than or equal to 200 MPa, greater than or equal to 60 MPa and less than or equal to 150 MPa, greater than or equal to 80 MPa and less than or equal to 250 MPa, greater than or equal to 80 MPa and less than or equal to 200 MPa, greater than or equal to 80 MPa and less than or equal to 150 MPa, greater than or equal to 100 MPa and less than or equal to 250 MPa, greater than or equal to 100 MPa and less than or equal to 200 MPa, or even greater than or equal to 100 MPa and less than or equal to 150 MPa, or any and all sub-ranges formed from any of these endpoints. As utilized herein, central tension refers to a maximum central tension value unless otherwise indicated.
[0080] As described herein, the glass compositions described herein include a colorant that comprises or consists of transition metal oxides, rare earth oxides, or combinations thereof, to achieve a desired color. In embodiments, a colored glass article may have a transmittance color coordinate in the CIELAB color space, under F2 illumination and a 10° standard observer angle, of L* greater than or equal to 85 and less than or equal to 98, a* greater than or equal to −4.0 and less than or equal to 0, and b* greater than or equal to 0.1 and less than or equal to 12. In embodiments, a colored glass article may have a transmittance color coordinate in the CIELAB color space, under F2 illumination and a 10° standard observer angle, of L* greater than or equal to 90 and less than or equal to 98, a* greater than or equal to −1.0 and less than or equal to 0, and b* greater than or equal to 1.0 and less than or equal to 6.0. In embodiments, a colored glass article may have a transmittance color coordinate in the CIELAB color space, under F2 illumination and a 10° standard observer angle, of L* greater than or equal to 92 and less than or equal to 98, a* greater than or equal to −1.0 and less than or equal to −0.6, and b* greater than or equal to 3.5 and less than or equal to 5.5.
[0081] In embodiments, a colored glass article may have a transmittance color coordinate in the CIELAB color space, as measured under F2 illumination and a 10° standard observer angle, of L* greater than or equal to 85 and less than or equal to 98, such as greater than or equal to 90 and less than or equal to 98, greater than or equal to 92 and less than or equal to 98, greater than or equal to 91 and less than or equal to 96, or any and all sub-ranges formed from any of these endpoints.
[0082] In embodiments, a colored glass article may have a transmittance color coordinate in the CIELAB color space, as measured under F2 illumination and a 10° standard observer angle, of a* greater than or equal to −4.0 and less than or equal to 0, greater than or equal to −3.0 and less than or equal to 0, greater than or equal to −2.0 and less than or equal to −0.1, greater than or equal to −1.0 and less than or equal to −0.5, greater than or equal to −1.0 and less than or equal to −0.6, or any and all sub-ranges formed from any of these endpoints.
[0083] In embodiments, a colored glass article may have a transmittance color coordinate in the CIELAB color space, as measured under F2 illumination and a 10° standard observer angle, of b* greater than or equal to 0.1 and less than or equal to 12, greater than or equal to 0.5 and less than or equal to 11, greater than or equal to 1.0 and less than or equal to 10.0, greater than or equal to 1.0 and less than or equal to 6.0, greater than or equal to 1.5 and less than or equal to 9.5, greater than or equal to 2.0 and less than or equal to 9.0, greater than or equal to 2.5 and less than or equal to 8.5, greater than or equal to 3.0 and less than or equal to 8.0, greater than or equal to 3.5 and less than or equal to 7.5, greater than or equal to 4.0 and less than or equal to 7.0, greater than or equal to 4.5 and less than or equal to 6.5, greater than or equal to 5.0 and less than or equal to 6.0, greater than or equal to 3.5 and less than or equal to 5.5, or any and all sub-ranges formed from any of these endpoints.
[0084] The colored glass articles described herein may be used for a variety of applications including, for example, back cover applications in consumer or commercial electronic devices such as smartphones, tablet computers, personal computers, ultrabooks, televisions, and cameras. An exemplary article incorporating any of the colored glass articles disclosed herein is shown in
EXAMPLES
[0085] In order that various embodiments be more readily understood, reference is made to the following examples, which illustrate various embodiments of the colored glass articles described herein.
[0086] Table 1 shows the analyzed compositions of exemplary colored glass articles (in terms of mol %). Examples 422 to 448 in Table I were annealed at 600° C. for 1 hour prior to analysis.
TABLE-US-00001 TABLE I Example 1 2 3 4 5 6 7 8 9 10 SiO.sub.2 61.002 60.927 60.970 61.007 61.010 60.948 61.004 61.073 61.062 61.035 Al.sub.2O.sub.3 15.489 15.485 15.422 15.381 15.380 15.350 15.307 15.296 15.263 15.237 B.sub.2O.sub.3 6.051 6.055 6.050 6.048 6.007 6.008 6.006 6.011 6.013 6.015 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.486 9.491 9.483 9.481 9.396 9.397 9.394 9.317 9.319 9.323 Na.sub.2O 1.581 1.601 1.608 1.612 1.655 1.700 1.673 1.680 1.695 1.710 K.sub.2O 0.196 0.197 0.199 0.196 0.197 0.202 0.196 0.196 0.196 0.197 MgO 1.959 1.949 1.921 1.902 1.867 1.861 1.846 1.833 1.828 1.808 CaO 4.201 4.214 4.211 4.204 4.229 4.237 4.240 4.246 4.258 4.259 ZnO 0.000 0.000 0.000 0.001 0.001 0.001 0.001 0.001 0.000 0.000 SnO.sub.2 0.001 0.002 0.002 0.003 0.002 0.003 0.002 0.003 0.002 0.003 Fe.sub.2O.sub.3 0.007 0.007 0.007 0.007 0.008 0.007 0.007 0.007 0.007 0.007 TiO.sub.2 0.016 0.048 0.088 0.108 0.172 0.199 0.223 0.233 0.248 0.281 CeO.sub.2 0.009 0.020 0.037 0.045 0.073 0.084 0.096 0.102 0.105 0.122 ZrO.sub.2 0.002 0.003 0.004 0.004 0.004 0.003 0.003 0.004 0.003 0.004 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 0.025 0.068 0.125 0.153 0.244 0.283 0.319 0.334 0.353 0.403 R.sub.2O 11.262 11.289 11.290 11.289 11.248 11.299 11.263 11.192 11.211 11.230 Li.sub.2O + Na.sub.2O 11.067 11.092 11.091 11.093 11.051 11.097 11.067 10.996 11.014 11.033 R.sub.2O − Al.sub.2O.sub.3 −4.227 −4.196 −4.132 −4.092 −4.132 −4.052 −4.044 −4.104 −4.052 −4.007 R′O 6.160 6.163 6.131 6.107 6.097 6.099 6.087 6.080 6.086 6.067 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 96.82 96.83 96.86 96.87 96.88 96.87 96.87 96.84 96.87 96.85 a* −0.07 −0.07 −0.06 −0.05 −0.06 −0.08 −0.1 −0.1 −0.11 −0.14 b* 0.29 0.29 0.3 0.32 0.4 0.49 0.57 0.62 0.66 0.81 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 11 12 13 14 15 16 17 18 19 20 SiO.sub.2 60.976 60.958 60.918 60.830 60.802 60.816 60.779 60.702 60.716 60.696 Al.sub.2O.sub.3 15.190 15.176 15.147 15.121 15.063 14.993 14.977 14.982 14.810 14.781 B.sub.2O.sub.3 6.021 6.020 6.021 6.050 6.051 6.005 6.006 6.008 6.010 6.011 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.382 9.380 9.382 9.290 9.293 9.335 9.337 9.340 9.343 9.344 Na.sub.2O 1.716 1.729 1.742 1.786 1.814 1.829 1.843 1.850 1.893 1.908 K.sub.2O 0.200 0.198 0.199 0.197 0.199 0.198 0.199 0.197 0.200 0.200 MgO 1.788 1.780 1.769 1.729 1.699 1.666 1.658 1.651 1.581 1.567 CaO 4.255 4.256 4.275 4.321 4.323 4.334 4.335 4.359 4.360 4.372 ZnO 0.001 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SnO.sub.2 0.003 0.003 0.003 0.002 0.003 0.003 0.003 0.003 0.003 0.003 Fe.sub.2O.sub.3 0.007 0.007 0.007 0.007 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 0.321 0.345 0.371 0.466 0.522 0.570 0.602 0.635 0.763 0.788 CeO.sub.2 0.137 0.145 0.161 0.197 0.221 0.241 0.250 0.263 0.312 0.320 ZrO.sub.2 0.003 0.003 0.004 0.004 0.004 0.004 0.004 0.005 0.004 0.005 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 0.458 0.489 0.532 0.663 0.743 0.811 0.853 0.897 1.075 1.107 R.sub.2O 11.298 11.308 11.323 11.274 11.306 11.362 11.379 11.387 11.435 11.452 Li.sub.2O + Na.sub.2O 11.098 11.110 11.124 11.076 11.106 11.164 11.180 11.190 11.235 11.252 R.sub.2O − Al.sub.2O.sub.3 −3.893 −3.868 −3.824 −3.848 −3.757 −3.630 −3.597 −3.595 −3.375 −3.329 R′O 6.044 6.036 6.046 6.050 6.022 5.999 5.993 6.010 5.941 5.939 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 96.84 96.82 96.81 96.78 96.75 96.71 96.69 96.67 96.57 96.53 a* −0.18 −0.2 −0.23 −0.33 −0.39 −0.47 −0.51 −0.56 −0.74 −0.79 b* 0.97 1.08 1.22 1.72 2.05 2.46 2.65 2.96 3.99 4.26 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 21 22 23 24 25 26 27 28 29 30 SiO.sub.2 60.631 60.704 60.669 60.654 60.659 60.639 60.654 60.777 60.742 60.733 Al.sub.2O.sub.3 14.741 14.741 14.749 14.758 14.738 14.739 14.725 14.647 14.654 14.635 B.sub.2O.sub.3 6.012 6.041 6.042 6.040 6.040 6.040 5.987 5.986 5.987 5.986 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.347 9.104 9.106 9.103 9.103 9.103 9.128 9.126 9.127 9.127 Na.sub.2O 1.931 1.972 1.966 1.971 1.976 1.975 1.991 1.981 1.982 1.995 K.sub.2O 0.201 0.202 0.203 0.200 0.201 0.199 0.201 0.201 0.202 0.199 MgO 1.544 1.537 1.529 1.530 1.527 1.519 1.513 1.489 1.490 1.491 CaO 4.396 4.427 4.439 4.438 4.438 4.449 4.451 4.427 4.434 4.439 ZnO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 SnO.sub.2 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 0.844 0.902 0.918 0.926 0.934 0.950 0.958 0.966 0.979 0.991 CeO.sub.2 0.338 0.359 0.365 0.367 0.370 0.373 0.379 0.387 0.388 0.391 ZrO.sub.2 0.005 0.004 0.004 0.004 0.005 0.004 0.004 0.004 0.004 0.005 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.182 1.261 1.283 1.292 1.304 1.323 1.337 1.353 1.367 1.381 R.sub.2O 11.479 11.278 11.275 11.274 11.281 11.278 11.320 11.309 11.312 11.320 Li.sub.2O + Na.sub.2O 11.277 11.076 11.072 11.074 11.079 11.079 11.119 11.107 11.109 11.122 R.sub.2O − Al.sub.2O.sub.3 −3.262 −3.463 −3.474 −3.483 −3.458 −3.461 −3.405 −3.338 −3.343 −3.315 R′O 5.940 5.963 5.968 5.968 5.964 5.968 5.964 5.916 5.926 5.929 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 96.44 96.37 96.36 96.34 96.3 96.32 96.3 96.27 96.26 96.24 a* −0.89 −0.99 −1.01 −1.03 −1.05 −1.07 −1.1 −1.12 −1.15 −1.17 b* 4.9 5.52 5.65 5.78 5.91 6.05 6.2 6.36 6.54 6.67 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 31 32 33 34 35 36 37 38 39 40 SiO.sub.2 60.647 60.851 60.921 60.845 60.809 60.660 60.650 60.706 60.692 60.684 Al.sub.2O.sub.3 14.685 14.689 14.621 14.656 14.674 14.606 14.621 14.595 14.584 14.598 B.sub.2O.sub.3 5.989 6.014 6.012 6.014 6.016 6.038 6.039 6.038 6.039 6.040 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.130 8.904 8.901 8.903 8.906 9.099 9.101 9.100 9.101 9.102 Na.sub.2O 1.995 1.991 2.005 2.013 2.009 2.015 2.006 1.995 2.006 2.008 K.sub.2O 0.200 0.201 0.203 0.202 0.200 0.203 0.201 0.200 0.200 0.202 MgO 1.490 1.492 1.481 1.488 1.485 1.481 1.479 1.472 1.474 1.474 CaO 4.455 4.446 4.433 4.445 4.447 4.436 4.436 4.425 4.425 4.414 ZnO 0.001 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SnO.sub.2 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 0.998 1.000 1.008 1.016 1.025 1.022 1.022 1.022 1.022 1.022 CeO.sub.2 0.395 0.397 0.400 0.405 0.415 0.426 0.431 0.433 0.443 0.442 ZrO.sub.2 0.004 0.004 0.004 0.004 0.005 0.005 0.005 0.004 0.005 0.005 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.393 1.397 1.408 1.421 1.440 1.448 1.453 1.455 1.465 1.464 R.sub.2O 11.326 11.096 11.109 11.118 11.115 11.317 11.308 11.295 11.307 11.312 Li.sub.2O + Na.sub.2O 11.126 10.895 10.906 10.916 10.915 11.114 11.107 11.095 11.107 11.110 R.sub.2O − Al.sub.2O.sub.3 −3.359 −3.593 −3.512 −3.538 −3.560 −3.289 −3.313 −3.299 −3.277 −3.286 R′O 5.946 5.939 5.914 5.933 5.932 5.917 5.915 5.897 5.899 5.888 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 96.26 96.24 96.25 96.21 96.17 96.13 96.11 96.1 96.09 96.05 a* −1.18 −1.18 −1.2 −1.22 −1.27 −1.31 −1.32 −1.33 −1.35 −1.37 b* 6.75 6.76 6.86 7.03 7.34 7.65 7.77 7.86 7.97 8.15 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 41 42 43 44 45 46 47 48 49 50 SiO.sub.2 60.676 60.627 60.659 60.557 60.488 60.462 60.525 60.517 60.541 60.560 Al.sub.2O.sub.3 14.658 14.671 14.658 14.704 14.707 14.707 14.666 14.666 14.647 14.641 B.sub.2O.sub.3 5.992 5.992 5.992 5.995 6.001 6.002 6.000 6.000 6.000 6.000 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 8.998 8.998 8.998 9.003 9.013 9.013 9.011 9.011 9.011 9.011 Na.sub.2O 2.020 2.027 2.017 2.033 2.029 2.027 2.024 2.030 2.025 2.023 K.sub.2O 0.203 0.204 0.201 0.201 0.203 0.202 0.203 0.204 0.204 0.202 MgO 1.480 1.483 1.475 1.479 1.477 1.489 1.485 1.485 1.485 1.479 CaO 4.449 4.461 4.461 4.475 4.468 4.480 4.467 4.468 4.463 4.455 ZnO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SnO.sub.2 0.004 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 1.033 1.041 1.041 1.042 1.043 1.043 1.043 1.043 1.043 1.043 CeO.sub.2 0.476 0.481 0.484 0.498 0.558 0.562 0.562 0.563 0.568 0.572 ZrO.sub.2 0.006 0.005 0.004 0.004 0.004 0.005 0.005 0.004 0.005 0.005 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.509 1.522 1.525 1.540 1.601 1.605 1.604 1.606 1.611 1.615 R.sub.2O 11.221 11.229 11.217 11.237 11.244 11.241 11.238 11.245 11.239 11.236 Li.sub.2O + Na.sub.2O 11.018 11.025 11.015 11.036 11.041 11.040 11.035 11.041 11.036 11.034 R.sub.2O − Al.sub.2O.sub.3 −3.436 −3.442 −3.442 −3.467 −3.463 −3.466 −3.428 −3.421 −3.407 −3.405 R′O 5.929 5.944 5.936 5.954 5.946 5.968 5.952 5.953 5.948 5.933 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 95.95 95.92 95.9 95.86 95.6 95.6 95.46 95.44 95.46 95.46 a* −1.45 −1.48 −1.49 −1.52 −1.67 −1.66 −1.66 −1.67 −1.68 −1.68 b* 8.86 9.08 9.2 9.44 10.94 10.9 11.05 11.13 11.2 11.28 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 51 52 53 54 55 56 57 58 59 60 SiO.sub.2 60.513 60.470 60.471 60.487 60.502 60.460 60.459 60.385 60.465 60.434 Al.sub.2O.sub.3 14.673 14.696 14.696 14.680 14.667 14.697 14.697 14.715 14.659 14.675 B.sub.2O.sub.3 6.003 6.005 6.005 6.031 6.031 6.033 6.033 6.054 6.051 6.053 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.015 9.018 9.018 8.994 8.994 8.996 8.997 8.978 8.975 8.977 Na.sub.2O 2.018 2.016 2.014 2.023 2.020 2.029 2.025 2.029 2.028 2.023 K.sub.2O 0.201 0.202 0.203 0.201 0.203 0.202 0.201 0.203 0.202 0.201 MgO 1.484 1.491 1.484 1.484 1.484 1.480 1.487 1.477 1.476 1.469 CaO 4.456 4.459 4.465 4.473 4.471 4.474 4.468 4.475 4.455 4.453 ZnO 0.000 0.000 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 SnO.sub.2 0.004 0.003 0.004 0.003 0.003 0.003 0.003 0.003 0.003 0.004 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 1.043 1.044 1.042 1.028 1.028 1.028 1.031 1.081 1.087 1.106 CeO.sub.2 0.578 0.585 0.585 0.584 0.586 0.585 0.588 0.589 0.586 0.591 ZrO.sub.2 0.005 0.005 0.005 0.004 0.004 0.005 0.004 0.004 0.005 0.005 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.622 1.629 1.627 1.611 1.614 1.613 1.619 1.670 1.674 1.698 R.sub.2O 11.234 11.236 11.235 11.218 11.217 11.227 11.222 11.210 11.205 11.201 Li.sub.2O + Na.sub.2O 11.033 11.034 11.032 11.017 11.014 11.025 11.021 11.006 11.003 11.000 R.sub.2O − Al.sub.2O.sub.3 −3.439 −3.461 −3.461 −3.462 −3.450 −3.469 −3.475 −3.505 −3.454 −3.474 R′O 5.940 5.950 5.950 5.959 5.956 5.956 5.956 5.954 5.933 5.924 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 95.38 95.38 95.45 95.4 95.43 95.44 95.42 95.4 95.39 95.38 a* −1.7 −1.7 −1.72 −1.72 −1.73 −1.73 −1.73 −1.79 −1.8 −1.83 b* 11.45 11.52 11.59 11.74 11.76 11.76 11.8 12.13 12.24 12.42 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 61 62 63 64 65 66 67 68 69 70 SiO.sub.2 60.414 60.401 60.373 60.387 60.323 60.339 60.319 60.321 60.332 60.332 Al.sub.2O.sub.3 14.673 14.662 14.685 14.665 14.700 14.681 14.696 14.696 14.696 14.701 B.sub.2O.sub.3 6.052 6.053 6.054 6.054 6.055 5.988 5.989 5.989 5.989 5.988 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 8.976 8.977 8.979 8.979 8.981 9.020 9.022 9.021 9.022 9.020 Na.sub.2O 2.026 2.022 2.028 2.023 2.031 2.026 2.023 2.023 2.017 2.021 K.sub.2O 0.200 0.202 0.202 0.201 0.202 0.203 0.202 0.204 0.202 0.203 MgO 1.484 1.480 1.472 1.465 1.468 1.478 1.480 1.478 1.476 1.473 CaO 4.470 4.461 4.455 4.464 4.474 4.487 4.484 4.485 4.484 4.488 ZnO 0.002 0.002 0.002 0.002 0.000 0.002 0.000 0.002 0.000 0.002 SnO.sub.2 0.004 0.004 0.003 0.004 0.003 0.004 0.004 0.003 0.003 0.004 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 1.101 1.135 1.144 1.152 1.158 1.171 1.174 1.171 1.174 1.171 CeO.sub.2 0.587 0.591 0.593 0.594 0.594 0.592 0.597 0.596 0.594 0.586 ZrO.sub.2 0.005 0.004 0.005 0.005 0.005 0.005 0.005 0.005 0.005 0.005 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.688 1.727 1.737 1.746 1.751 1.763 1.771 1.767 1.768 1.757 R.sub.2O 11.202 11.201 11.209 11.203 11.214 11.249 11.247 11.249 11.241 11.245 Li.sub.2O + Na.sub.2O 11.002 10.999 11.007 11.002 11.012 11.046 11.045 11.045 11.039 11.042 R.sub.2O − Al.sub.2O.sub.3 −3.471 −3.462 −3.476 −3.462 −3.486 −3.432 −3.449 −3.447 −3.456 −3.456 R′O 5.956 5.942 5.928 5.930 5.942 5.966 5.965 5.965 5.960 5.963 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) * 95.35 95.29 95.28 95.27 95.27 95.27 95.27 95.27 95.24 95.3 a* −1.84 −1.91 −1.92 −1.93 −1.93 −1.97 −1.97 −1.96 −1.96 −1.95 b* 12.51 13.06 13.2 13.27 13.21 13.47 13.49 13.47 13.49 13.25 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 71 72 73 74 75 76 77 78 79 80 SiO.sub.2 60.295 60.290 60.285 60.395 60.350 60.436 60.382 60.449 60.481 60.565 Al.sub.2O.sub.3 14.728 14.745 14.743 14.679 14.719 14.678 14.724 14.692 14.681 14.678 B.sub.2O.sub.3 5.979 5.979 5.978 5.975 5.976 5.972 5.973 5.970 5.968 5.967 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.021 9.020 9.019 9.015 9.016 9.011 9.011 9.007 9.005 9.003 Na.sub.2O 2.028 2.023 2.025 2.014 2.025 2.034 2.032 2.020 2.021 2.020 K.sub.2O 0.202 0.202 0.201 0.203 0.202 0.203 0.201 0.202 0.202 0.199 MgO 1.480 1.477 1.482 1.476 1.472 1.467 1.471 1.473 1.478 1.472 CaO 4.496 4.507 4.506 4.492 4.492 4.479 4.491 4.477 4.484 4.463 ZnO 0.000 0.000 0.000 0.000 0.002 0.000 0.000 0.000 0.001 0.000 SnO.sub.2 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.003 0.003 0.003 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 1.174 1.173 1.181 1.181 1.182 1.180 1.188 1.188 1.172 1.131 CeO.sub.2 0.583 0.570 0.565 0.556 0.550 0.525 0.514 0.506 0.493 0.488 ZrO.sub.2 0.005 0.005 0.005 0.004 0.004 0.005 0.004 0.005 0.005 0.005 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.756 1.744 1.747 1.737 1.732 1.705 1.702 1.694 1.665 1.619 R.sub.2O 11.251 11.245 11.245 11.231 11.243 11.248 11.244 11.230 11.227 11.222 Li.sub.2O + Na.sub.2O 11.049 11.043 11.044 11.028 11.041 11.045 11.043 11.028 11.025 11.023 R.sub.2O − Al.sub.2O.sub.3 −3.476 −3.500 −3.498 −3.448 −3.476 −3.430 −3.480 −3.462 −3.454 −3.456 R′O 5.976 5.984 5.988 5.969 5.966 5.946 5.961 5.950 5.963 5.936 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 95.33 95.36 95.41 95.42 95.45 95.57 95.64 95.66 95.65 95.81 a* −1.93 −1.91 −1.9 −1.89 −1.88 −1.8 −1.78 −1.75 −1.7 −1.58 b* 13.03 12.84 12.63 12.52 12.4 11.57 11.3 11.03 10.61 9.76 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 81 82 83 84 85 86 87 88 89 90 SiO.sub.2 60.576 60.566 60.579 60.603 60.735 60.761 60.731 60.660 60.607 60.663 Al.sub.2O.sub.3 14.676 14.702 14.695 14.690 14.628 14.622 14.646 14.681 14.746 14.719 B.sub.2O.sub.3 5.966 5.966 6.031 6.026 6.024 6.024 6.027 6.028 6.006 6.005 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2C 9.001 9.002 9.023 9.016 9.013 9.013 9.016 9.018 8.984 8.983 Na.sub.2O 2.013 2.026 2.010 2.016 2.015 2.008 2.017 2.008 2.018 2.006 K.sub.2O 0.201 0.199 0.202 0.200 0.199 0.200 0.200 0.199 0.199 0.201 MgO 1.483 1.487 1.487 1.488 1.470 1.475 1.474 1.499 1.503 1.505 CaO 4.474 4.474 4.474 4.468 4.452 4.446 4.448 4.465 4.499 4.476 ZnO 0.000 0.000 0.000 0.002 0.002 0.000 0.000 0.002 0.000 0.000 SnO.sub.2 0.003 0.003 0.003 0.004 0.003 0.003 0.004 0.003 0.003 0.003 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 1.106 1.074 0.985 0.974 0.938 0.920 0.911 0.904 0.906 0.905 CeO.sub.2 0.488 0.489 0.501 0.501 0.509 0.515 0.516 0.522 0.521 0.524 ZrO.sub.2 0.005 0.005 0.005 0.005 0.005 0.005 0.004 0.006 0.004 0.004 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.594 1.563 1.486 1.475 1.447 1.435 1.427 1.426 1.426 1.429 R.sub.2O 11.215 11.227 11.235 11.233 11.227 11.222 11.233 11.226 11.200 11.190 Li.sub.2O + Na.sub.2O 11.014 11.028 11.033 11.032 11.028 11.021 11.034 11.027 11.001 10.989 R.sub.2O − Al.sub.2O.sub.3 −3.461 −3.475 −3.461 −3.457 −3.402 −3.400 −3.413 −3.455 −3.546 −3.529 R′O 5.958 5.961 5.961 5.958 5.924 5.922 5.922 5.965 6.002 5.981 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 95.81 95.81 95.86 95.86 95.84 95.82 95.82 95.84 95.84 95.83 a* −1.59 −1.53 −1.49 −1.47 −1.53 −1.42 −1.41 −1.42 −1.42 −1.41 b* 9.81 9.45 9.28 9.2 9.44 9.04 8.99 9.03 9.07 9.03 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 91 92 93 94 95 96 97 98 99 100 SiO.sub.2 60.726 60.601 60.720 60.707 60.668 60.678 60.673 60.696 60.659 60.668 Al.sub.2O.sub.3 14.705 14.758 14.696 14.703 14.697 14.703 14.703 14.666 14.706 14.704 B.sub.2O.sub.3 6.005 6.008 6.006 6.006 6.013 6.013 6.013 6.011 6.014 6.013 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 8.982 8.987 8.985 8.985 9.024 9.024 9.024 9.021 9.026 9.024 Na.sub.2O 2.009 2.018 2.010 2.008 2.016 2.009 2.013 2.009 2.005 2.008 K.sub.2O 0.200 0.199 0.199 0.200 0.198 0.198 0.201 0.199 0.199 0.199 MgO 1.498 1.519 1.508 1.509 1.509 1.511 1.506 1.550 1.527 1.527 CaO 4.441 4.469 4.442 4.448 4.440 4.440 4.440 4.427 4.418 4.417 ZnO 0.000 0.002 0.000 0.002 0.000 0.000 0.000 0.000 0.000 0.000 SnO.sub.2 0.003 0.003 0.003 0.003 0.003 0.003 0.004 0.004 0.003 0.004 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 0.902 0.901 0.896 0.894 0.888 0.887 0.884 0.883 0.900 0.897 CeO.sub.2 0.519 0.524 0.524 0.525 0.532 0.524 0.528 0.522 0.533 0.528 ZrO.sub.2 0.004 0.004 0.004 0.005 0.005 0.005 0.004 0.004 0.005 0.005 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.421 1.426 1.420 1.418 1.420 1.411 1.411 1.406 1.433 1.425 R.sub.2O 11.191 11.205 11.193 11.193 11.238 11.230 11.238 11.229 11.229 11.231 Li.sub.2O + Na.sub.2O 10.991 11.006 10.994 10.993 11.040 11.032 11.037 11.030 11.030 11.032 R.sub.2O − Al.sub.2O.sub.3 −3.514 −3.553 −3.503 −3.510 −3.459 −3.472 −3.466 −3.437 −3.476 −3.473 R′O 5.939 5.990 5.950 5.959 5.949 5.951 5.946 5.978 5.945 5.944 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 95.85 95.84 95.84 95.85 95.85 95.87 95.85 95.87 95.85 95.87 a* −1.41 −1.41 −1.41 −1.41 −1.4 −1.4 −1.4 −1.39 −1.4 −1.39 b* 9.01 9.03 8.99 9.02 8.97 8.93 8.93 8.89 8.93 8.84 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 101 102 103 104 105 106 107 108 109 110 SiO.sub.2 60.669 60.684 60.652 60.705 60.708 60.663 60.672 60.718 60.695 60.765 Al.sub.2O.sub.3 14.704 14.681 14.707 14.679 14.679 14.692 14.728 14.714 14.720 14.679 B.sub.2O.sub.3 6.014 6.021 6.022 6.018 6.018 6.018 6.007 6.006 6.006 6.004 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.025 9.022 9.023 9.017 9.017 9.017 8.963 8.962 8.962 8.960 Na.sub.2O 2.010 2.008 2.015 2.005 2.003 2.003 2.006 2.007 2.010 2.007 K.sub.2O 0.199 0.199 0.198 0.199 0.198 0.198 0.199 0.197 0.200 0.199 MgO 1.525 1.533 1.536 1.541 1.538 1.554 1.550 1.543 1.540 1.538 CaO 4.418 4.416 4.417 4.409 4.414 4.421 4.431 4.419 4.430 4.418 ZnO 0.000 0.000 0.000 0.001 0.000 0.002 0.000 0.000 0.000 0.000 SnO.sub.2 0.004 0.003 0.003 0.004 0.003 0.004 0.004 0.004 0.003 0.003 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 0.894 0.893 0.893 0.889 0.888 0.894 0.897 0.889 0.897 0.891 CeO.sub.2 0.528 0.527 0.524 0.523 0.525 0.524 0.533 0.530 0.527 0.525 ZrO.sub.2 0.004 0.004 0.004 0.005 0.004 0.005 0.005 0.004 0.004 0.004 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.422 1.420 1.417 1.411 1.413 1.418 1.430 1.419 1.424 1.416 R.sub.2O 11.234 11.230 11.235 11.221 11.218 11.218 11.168 11.167 11.172 11.166 Li.sub.2O + Na.sub.2O 11.035 11.031 11.038 11.022 11.020 11.021 10.970 10.970 10.972 10.967 R.sub.2O − Al.sub.2O.sub.3 −3.470 −3.451 −3.472 −3.458 −3.460 −3.474 −3.560 −3.547 −3.548 −3.513 R′O 5.943 5.949 5.953 5.952 5.952 5.976 5.981 5.962 5.970 5.956 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 95.87 95.87 95.87 95.85 95.87 95.86 95.87 95.88 95.87 95.81 a* −1.38 −1.38 −1.38 −1.38 −1.38 −1.38 −1.38 −1.38 −1.38 −1.37 b* 8.83 8.81 8.83 8.82 8.84 8.82 8.79 8.78 8.81 8.8 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 111 112 113 114 115 116 117 118 119 120 SiO.sub.2 60.799 60.679 60.695 60.729 60.761 60.660 60.675 60.669 60.706 60.775 Al.sub.2O.sub.3 14.665 14.730 14.714 14.693 14.672 14.721 14.707 14.688 14.671 14.680 B.sub.2O.sub.3 6.004 6.007 6.015 6.014 6.013 6.015 6.015 6.010 6.008 5.974 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 8.959 8.964 8.962 8.961 8.960 8.963 8.962 9.041 9.037 9.000 Na.sub.2O 2.007 2.008 2.010 2.002 2.009 2.016 2.010 2.002 2.004 2.006 K.sub.2O 0.199 0.199 0.199 0.199 0.198 0.199 0.199 0.200 0.198 0.199 MgO 1.535 1.546 1.551 1.552 1.548 1.558 1.551 1.536 1.525 1.504 CaO 4.406 4.425 4.417 4.413 4.406 4.430 4.442 4.426 4.425 4.439 ZnO 0.000 0.002 0.002 0.002 0.000 0.000 0.000 0.000 0.000 0.000 SnO.sub.2 0.003 0.003 0.003 0.003 0.004 0.003 0.004 0.003 0.003 0.004 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 0.889 0.891 0.890 0.889 0.889 0.889 0.889 0.880 0.880 0.888 CeO.sub.2 0.524 0.534 0.531 0.532 0.530 0.534 0.535 0.535 0.533 0.521 ZrO.sub.2 0.004 0.005 0.005 0.004 0.004 0.005 0.005 0.004 0.004 0.005 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.413 1.425 1.422 1.422 1.419 1.423 1.424 1.415 1.412 1.409 R.sub.2O 11.165 11.171 11.171 11.162 11.166 11.178 11.171 11.243 11.239 11.204 Li.sub.2O + Na.sub.2O 10.966 10.972 10.972 10.963 10.968 10.978 10.972 11.043 11.041 11.006 R.sub.2O − Al.sub.2O.sub.3 −3.501 −3.559 −3.543 −3.531 −3.506 −3.544 −3.536 −3.446 −3.431 −3.475 R′O 5.941 5.973 5.970 5.967 5.954 5.988 5.993 5.962 5.950 5.943 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 95.87 95.86 95.87 95.86 95.86 95.84 95.85 95.85 95.85 95.91 a* −1.37 −1.38 −1.38 −1.38 −1.38 −1.38 −1.38 −1.38 −1.38 −1.36 b* 8.77 8.8 8.79 8.8 8.81 8.86 8.84 8.84 8.83 8.58 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 121 122 123 124 125 126 127 128 129 130 SiO.sub.2 60.747 60.799 60.778 60.734 60.742 60.783 60.797 60.807 60.903 60.905 Al.sub.2O.sub.3 14.692 14.685 14.688 14.699 14.705 14.689 14.693 14.692 14.633 14.672 B.sub.2O.sub.3 5.974 5.974 5.975 5.991 5.990 5.989 5.988 5.988 5.984 6.001 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 8.999 8.999 9.001 9.018 9.018 9.016 9.014 9.013 9.008 8.984 Na.sub.2O 2.011 2.003 2.011 2.009 2.008 2.004 2.010 2.013 2.001 2.008 K.sub.2O 0.201 0.199 0.201 0.201 0.201 0.200 0.200 0.199 0.200 0.200 MgO 1.510 1.493 1.494 1.492 1.487 1.492 1.485 1.485 1.486 1.493 CaO 4.450 4.441 4.450 4.465 4.460 4.450 4.447 4.447 4.444 4.431 ZnO 0.000 0.002 0.002 0.002 0.000 0.002 0.000 0.001 0.000 0.000 SnO.sub.2 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.004 0.003 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 0.888 0.884 0.884 0.887 0.888 0.883 0.887 0.884 0.887 0.887 CeO.sub.2 0.513 0.508 0.503 0.489 0.486 0.479 0.464 0.457 0.441 0.408 ZrO.sub.2 0.005 0.004 0.005 0.004 0.005 0.004 0.004 0.004 0.004 0.004 La.sub.203 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.401 1.392 1.386 1.376 1.374 1.362 1.352 1.341 1.328 1.294 R.sub.2O 11.211 11.201 11.213 11.228 11.226 11.220 11.223 11.225 11.209 11.191 Li.sub.2O + Na.sub.2O 11.011 11.002 11.012 11.027 11.026 11.019 11.024 11.026 11.009 10.991 R.sub.2O − Al.sub.2O.sub.3 −3.481 −3.484 −3.475 −3.471 −3.479 −3.470 −3.470 −3.467 −3.423 −3.482 R′O 5.961 5.936 5.945 5.958 5.947 5.944 5.932 5.933 5.930 5.924 Thickness 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 2.400 (mm) L* 95.91 95.95 95.96 96.05 96.03 96.08 95.85 96.15 96.19 96.29 a* −1.34 −1.33 −1.32 −1.29 −1.28 −1.27 −1.22 −1.22 −1.19 −1.1 b* 8.44 8.32 8.21 7.88 7.86 7.67 7.4 7.26 6.97 6.29 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 131 132 133 134 135 136 137 138 139 140 SiO.sub.2 60.915 60.903 61.594 61.212 61.723 61.723 61.723 61.723 61.566 61.654 Al.sub.2O.sub.3 14.675 14.680 15.016 14.863 14.763 14.763 14.763 14.763 14.849 14.808 B.sub.2O.sub.3 5.999 5.999 5.254 5.238 5.275 5.275 5.275 5.275 5.271 5.266 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 8.982 8.981 9.695 9.665 9.147 9.147 9.147 9.147 9.142 9.132 Na.sub.2O 2.011 2.013 3.772 2.563 2.244 2.244 2.244 2.244 2.094 2.153 K.sub.2O 0.199 0.199 0.066 0.154 0.181 0.181 0.181 0.181 0.194 0.190 MgO 1.496 1.496 0.477 1.178 1.334 1.334 1.334 1.334 1.429 1.375 CaO 4.428 4.441 3.499 4.167 4.313 4.313 4.313 4.313 4.423 4.400 ZnO 0.001 0.000 0.000 0.008 0.016 0.016 0.016 0.016 0.024 0.024 SnO.sub.2 0.003 0.004 0.115 0.087 0.046 0.046 0.046 0.046 0.026 0.038 Fe.sub.2O.sub.3 0.006 0.006 0.007 0.005 0.004 0.004 0.004 0.004 0.004 0.004 TiO.sub.2 0.886 0.886 0.188 0.474 0.549 0.549 0.549 0.549 0.587 0.562 CeO.sub.2 0.395 0.389 0.113 0.292 0.344 0.344 0.344 0.344 0.368 0.352 ZrO.sub.2 0.004 0.004 0.202 0.089 0.058 0.058 0.058 0.058 0.024 0.037 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.281 1.275 0.301 0.766 0.893 0.893 0.893 0.893 0.955 0.914 R.sub.2O 11.192 11.193 13.533 12.383 11.572 11.572 11.572 11.572 11.429 11.476 Li.sub.2O + Na.sub.2O 10.993 10.994 13.467 12.229 11.391 11.391 11.391 11.391 11.235 11.286 R.sub.2O − Al.sub.2O.sub.3 −3.484 −3.487 −1.483 −2.480 −3.191 −3.191 −3.191 −3.191 −3.419 −3.332 R′O 5.925 5.937 3.976 5.353 5.662 5.662 5.662 5.662 5.876 5.799 Thickness 2.400 2.400 4.127 4.024 4.354 3.967 4.238 4.057 4.025 4.010 (mm) L* 96.32 96.21 96.54 96.42 96.22 96.19 96.3 96.28 96.1 96.19 a* −1.06 −1.03 −0.14 −0.39 −0.71 −0.69 −0.7 −0.71 −0.95 −0.76 b* 6.06 5.92 0.72 2.2 4.11 3.99 4.02 4.06 5.52 4.33 Density 2.419 2.429 2.429 2.429 2.429 (g/cm.sup.3) Liquidus Temp. (° C.) 141 142 143 144 145 146 147 148 149 150 61.220 61.167 61.145 61.056 61.074 60.985 60.554 60.376 60.288 60.985 14.708 14.714 14.714 14.757 14.730 14.689 14.728 14.704 14.690 14.689 5.980 5.975 5.975 5.975 5.976 6.003 6.012 6.012 6.051 6.003 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 9.074 9.066 9.066 9.066 9.068 9.109 9.122 9.123 9.083 9.109 2.136 2.017 1.988 1.976 1.979 2.005 2.003 1.985 1.983 2.005 0.186 0.196 0.200 0.200 0.200 0.201 0.202 0.200 0.202 0.201 1.368 1.457 1.459 1.488 1.496 1.516 1.500 1.497 1.504 1.516 4.357 4.436 4.443 4.467 4.450 4.471 4.491 4.492 4.493 4.471 0.008 0.016 0.016 0.016 0.016 0.024 0.016 0.024 0.016 0.024 0.043 0.012 0.013 0.012 0.023 0.025 0.015 0.016 0.017 0.025 0.004 0.004 0.004 0.004 0.003 0.004 0.003 0.003 0.003 0.004 0.547 0.581 0.592 0.597 0.597 0.595 0.962 1.172 1.271 0.595 0.329 0.341 0.367 0.368 0.366 0.368 0.385 0.391 0.390 0.368 0.041 0.014 0.014 0.014 0.019 0.005 0.002 0.005 0.876 0.922 0.960 0.966 0.963 0.963 1.347 1.563 1.661 0.963 11.396 11.279 11.254 11.242 11.247 11.316 11.327 11.308 11.267 11.316 11.210 11.083 11.054 11.042 11.047 11.115 11.125 11.108 11.066 11.115 −3.312 −3.435 −3.459 −3.515 −3.483 −3.373 −3.401 −3.396 −3.423 −3.373 5.733 5.909 5.917 5.970 5.961 6.010 6.007 6.013 6.012 6.010 4.063 4.071 4.177 4.123 4.387 4.114 4.191 4.286 3.986 2.441 96.26 96.07 96.05 96.04 96.07 96.1 95.79 95.61 95.64 96.29 −0.71 −0.92 −1.02 −1.02 −0.99 −1.01 −1.5 −1.81 −1.92 −0.63 3.98 5.31 5.94 5.94 5.73 5.8 8.64 10.49 11.13 3.67 2.427 2.427 2.429 2.430 2.430 2.437 2.439 2.430 Example 151 152 153 154 155 156 157 158 159 160 SiO.sub.2 60.554 60.376 60.288 60.152 60.135 60.130 60.007 60.152 60.135 60.130 Al.sub.2O.sub.3 14.728 14.704 14.690 14.713 14.694 14.683 14.684 14.713 14.694 14.683 B.sub.2O.sub.3 6.012 6.012 6.051 6.063 6.061 6.061 6.075 6.063 6.061 6.061 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.122 9.123 9.083 9.101 9.097 9.098 9.199 9.101 9.097 9.098 Na.sub.2O 2.003 1.985 1.983 1.987 1.986 1.973 1.954 1.987 1.986 1.973 K.sub.2O 0.202 0.200 0.202 0.201 0.204 0.203 0.202 0.201 0.204 0.203 MgO 1.500 1.497 1.504 1.504 1.501 1.487 1.491 1.504 1.501 1.487 CaO 4.491 4.492 4.493 4.499 4.486 4.485 4.491 4.499 4.486 4.485 ZnO 0.016 0.024 0.016 0.024 0.024 0.024 0.016 0.024 0.024 0.024 SnO.sub.2 0.015 0.016 0.017 0.015 0.019 0.022 0.018 0.015 0.019 0.022 Fe.sub.2O.sub.3 0.003 0.003 0.003 0.003 0.003 0.004 0.004 0.003 0.003 0.004 TiO.sub.2 0.962 1.172 1.271 1.343 1.399 1.433 1.462 1.343 1.399 1.433 CeO.sub.2 0.385 0.391 0.390 0.390 0.384 0.389 0.389 0.390 0.384 0.389 ZrO.sub.2 0.002 0.003 0.004 0.003 0.003 0.004 La.sub.203 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.347 1.563 1.661 1.733 1.783 1.822 1.852 1.733 1.783 1.822 R.sub.2O 11.327 11.308 11.267 11.289 11.287 11.273 11.355 11.289 11.287 11.273 Li.sub.2O + Na.sub.2O 11.125 11.108 11.066 11.088 11.083 11.070 11.153 11.088 11.083 11.070 R.sub.2O − Al.sub.2O.sub.3 −3.401 3.396 −3.423 −3.424 −3.407 −3.410 −3.329 −3.424 −3.407 −3.410 R′O 6.007 6.013 6.012 6.027 6.011 5.996 5.997 6.027 6.011 5.996 Thickness 2.453 2.444 2.451 4.294 4.203 4.375 4.076 2.400 2.421 2.420 (mm) L* 96.14 96.07 96.02 95.56 95.62 95.61 95.49 96.03 96.04 96.01 a* −0.99 −1.16 −1.26 −2.08 −2.06 −2.16 −2.25 −1.32 −1.37 −1.41 b* 5.6 6.53 7.12 12.16 11.93 12.57 13.31 7.4 7.63 7.84 Density 2.437 2.439 2.440 2.440 2.440 2.440 (g/cm.sup.3) Liquidus Temp. (° C.) Example 161 162 163 164 165 166 167 168 169 170 SiO.sub.2 60.007 60.059 59.947 59.925 59.694 60.059 59.947 59.925 59.694 59.634 Al.sub.2O.sub.3 14.684 14.657 14.686 14.672 14.706 14.657 14.686 14.672 14.706 14.690 B.sub.2O.sub.3 6.075 6.064 6.079 6.070 6.078 6.064 6.079 6.070 6.078 6.082 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.199 9.182 9.204 9.191 9.195 9.182 9.204 9.191 9.195 9.201 Na.sub.2O 1.954 1.959 1.981 1.980 1.967 1.959 1.981 1.980 1.967 1.964 K.sub.2O 0.202 0.201 0.203 0.206 0.205 0.201 0.203 0.206 0.205 0.203 MgO 1.491 1.491 1.495 1.493 1.502 1.491 1.495 1.493 1.502 1.483 CaO 4.491 4.464 4.492 4.481 4.496 4.464 4.492 4.481 4.496 4.485 ZnO 0.016 0.024 0.016 0.032 0.048 0.024 0.016 0.032 0.048 0.056 SnO.sub.2 0.018 0.022 0.019 0.012 0.014 0.022 0.019 0.012 0.014 0.015 Fe.sub.2O.sub.3 0.004 0.003 0.003 0.003 0.002 0.003 0.003 0.003 0.002 0.002 TiO.sub.2 1.462 1.468 1.482 1.490 1.497 1.468 1.482 1.490 1.497 1.504 CeO.sub.2 0.389 0.394 0.391 0.439 0.586 0.394 0.391 0.439 0.586 0.681 ZrO.sub.2 0.003 0.006 0.001 0.001 0.006 0.001 0.001 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.852 1.862 1.873 1.929 2.083 1.862 1.873 1.929 2.083 2.184 R.sub.2O 11.355 11.342 11.388 11.378 11.367 11.342 11.388 11.378 11.367 11.368 Li.sub.2O + Na.sub.2O 11.153 11.141 11.185 11.171 11.162 11.141 11.185 11.171 11.162 11.165 R.sub.2O − Al.sub.2O.sub.3 −3.329 −3.315 −3.298 3.294 −3.340 −3.315 −3.298 −3.294 −3.340 −3.322 R′O 5.997 5.979 6.003 6.006 6.046 5.979 6.003 6.006 6.046 6.024 Thickness 2.423 4.163 4.353 4.547 4.077 2.444 2.459 2.448 2.425 4.414 (mm) L* 95.98 95.39 95.46 95.07 94.15 95.94 95.92 95.74 95.14 93.33 a* −1.46 −2.28 −2.27 −2.59 −3 −1.49 −1.53 −1.73 −2.17 −3.15 b* 8.19 13.49 13.41 16.27 21.96 8.33 8.57 10.16 14.23 26.17 Density 2.441 2.443 2.441 2.443 2.456 (g/cm.sup.3) Liquidus Temp. (° C.) Example 171 172 173 174 175 176 177 178 179 180 SiO.sub.2 59.620 59.511 59.558 59.634 59.620 59.511 59.558 59.578 59.529 59.531 Al.sub.2O.sub.3 14.682 14.725 14.762 14.690 14.682 14.725 14.762 14.727 14.766 14.745 B.sub.2O.sub.3 6.083 6.086 6.072 6.082 6.083 6.086 6.072 6.084 6.073 6.078 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.204 9.207 9.084 9.201 9.204 9.207 9.084 9.102 9.086 9.093 Na.sub.2O 1.986 1.974 1.974 1.964 1.986 1.974 1.974 1.971 1.970 1.986 K.sub.2O 0.202 0.200 0.201 0.203 0.202 0.200 0.201 0.204 0.205 0.207 MgO 1.469 1.497 1.482 1.483 1.469 1.497 1.482 1.490 1.510 1.490 CaO 4.470 4.496 4.507 4.485 4.470 4.496 4.507 4.503 4.504 4.507 ZnO 0.048 0.048 0.064 0.056 0.048 0.048 0.064 0.048 0.056 0.064 SnO.sub.2 0.023 0.015 0.021 0.015 0.023 0.015 0.021 0.022 0.021 0.019 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.001 0.001 TiO.sub.2 1.501 1.505 1.504 1.504 1.501 1.505 1.504 1.509 1.512 1.506 CeO.sub.2 0.704 0.729 0.757 0.681 0.704 0.729 0.757 0.756 0.763 0.769 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 2.205 2.234 2.261 2.184 2.205 2.234 2.261 2.265 2.274 2.275 R.sub.2O 11.392 11.382 11.259 11.368 11.392 11.382 11.259 11.277 11.261 11.286 Li.sub.2O + Na.sub.2O 11.190 11.181 11.058 11.165 11.190 11.181 11.058 11.073 11.056 11.079 R.sub.2O − Al.sub.2O.sub.3 −3.289 −3.343 −3.503 −3.322 −3.289 −3.343 −3.503 −3.450 −3.504 −3.459 R′O 5.987 6.041 6.053 6.024 5.987 6.041 6.053 6.041 6.070 6.061 Thickness 4.551 4.166 4.152 2.482 2.478 2.454 2.423 4.194 4.282 4.847 (mm) L* 93.19 92.97 92.74 94.62 94.58 94.36 94.27 92.73 92.66 92.63 a* −3.19 −3.17 −3.2 −2.4 −2.42 −2.48 −2.5 −3.19 −3.21 −3.2 b* 27.13 28.08 29.2 17.11 17.47 18.53 18.96 29.21 29.67 29.65 Density 2.459 2.461 2.456 2.459 2.461 2.461 2.462 (g/cm.sup.3) Liquidus Temp. (° C.) Example 181 182 183 184 185 186 187 188 189 190 SiO.sub.2 59.645 59.578 59.529 59.531 59.645 59.759 59.810 60.264 60.495 60.007 Al.sub.2O.sub.3 14.728 14.727 14.766 14.745 14.728 14.750 14.715 14.777 14.795 14.684 B.sub.2O.sub.3 6.084 6.084 6.073 6.078 6.084 6.080 6.079 6.075 6.062 6.075 P.sub.2Og 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.037 9.102 9.086 9.093 9.037 9.031 9.029 9.024 9.047 9.199 Na.sub.2O 1.958 1.971 1.970 1.986 1.958 1.962 1.976 1.996 1.983 1.954 K.sub.2O 0.205 0.204 0.205 0.207 0.205 0.204 0.205 0.206 0.202 0.202 MgO 1.487 1.490 1.510 1.490 1.487 1.489 1.481 1.493 1.491 1.491 CaO 4.497 4.503 4.504 4.507 4.497 4.505 4.494 4.524 4.521 4.491 ZnO 0.064 0.048 0.056 0.064 0.064 0.064 0.056 0.056 0.056 0.016 SnO.sub.2 0.019 0.022 0.021 0.019 0.019 0.025 0.030 0.021 0.013 0.018 Fe.sub.2O.sub.3 0.001 0.002 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.004 TiO.sub.2 1.501 1.509 1.512 1.506 1.501 1.358 1.358 0.793 0.558 1.462 CeO.sub.2 0.765 0.756 0.763 0.769 0.765 0.768 0.766 0.769 0.771 0.389 ZrO.sub.2 0.003 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 2.267 2.265 2.274 2.275 2.267 2.126 2.124 1.563 1.329 1.852 R.sub.2O 11.200 11.277 11.261 11.286 11.200 11.197 11.210 11.225 11.232 11.355 .sub.2 Li.sub.2O + Na.sub.2O 10.994 11.073 11.056 11.079 10.994 10.993 11.005 11.020 11.030 11.153 R.sub.2O − Al.sub.2O.sub.3 −3.528 −3.450 −3.504 −3.459 −3.528 −3.553 −3.505 −3.552 −3.562 −3.329 R′O 6.048 6.041 6.070 6.061 6.048 6.058 6.031 6.073 6.068 5.997 Thickness 4.210 2.386 2.393 2.375 2.410 4.140 4.393 4.160 4.192 4.248 (mm) L* 92.66 94.28 94.27 94.27 94.28 92.93 93.19 93.99 94.22 94.67 a* −3.21 −2.48 −2.48 −2.47 −2.47 −3.07 −2.97 −2.05 −1.72 −2.94 b* 29.76 18.74 18.77 18.73 18.72 27.63 25.82 17.53 15.2 20.12 Density 2.461 2.461 2.462 2.461 2.459 2.453 2.449 (g/cm.sup.3) Liquidus Temp. (° C.) Example 191 192 193 194 195 196 197 198 199 200 SiO.sub.2 60.007 59.645 59.645 59.759 59.810 60.264 60.495 60.539 60.584 60.764 Al.sub.2O.sub.3 14.684 14.728 14.728 14.750 14.715 14.777 14.795 14.803 14.774 14.751 B.sub.2O.sub.3 6.075 6.084 6.084 6.080 6.079 6.075 6.062 6.047 6.048 6.030 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.199 9.037 9.037 9.031 9.029 9.024 9.047 9.025 9.027 8.941 Na.sub.2O 1.954 1.958 1.958 1.962 1.976 1.996 1.983 1.992 2.004 1.980 K.sub.2O 0.202 0.205 0.205 0.204 0.205 0.206 0.202 0.204 0.205 0.204 MgO 1.491 1.487 1.487 1.489 1.481 1.493 1.491 1.492 1.476 1.464 CaO 4.491 4.497 4.497 4.505 4.494 4.524 4.521 4.530 4.511 4.502 ZnO 0.016 0.064 0.064 0.064 0.056 0.056 0.056 0.056 0.051 0.055 SnO.sub.2 0.018 0.019 0.019 0.025 0.030 0.021 0.013 0.014 0.018 0.015 Fe.sub.2O.sub.3 0.004 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.002 0.002 TiO.sub.2 1.462 1.501 1.501 1.358 1.358 0.793 0.558 0.526 0.526 0.518 CeO.sub.2 0.389 0.765 0.765 0.768 0.766 0.769 0.771 0.768 0.772 0.771 ZrO.sub.2 0.003 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.852 2.267 2.267 2.126 2.124 1.563 1.329 1.295 1.297 1.289 R.sub.2O 11.355 11.200 11.200 11.197 11.210 11.225 11.232 11.220 11.235 11.125 Li.sub.2O + Na.sub.2O 11.153 10.994 10.994 10.993 11.005 11.020 11.030 11.016 11.030 10.921 R.sub.2O − Al.sub.2O.sub.3 −3.329 −3.528 −3.528 −3.553 −3.505 −3.552 −3.562 −3.582 −3.539 −3.626 R′O 5.997 6.048 6.048 6.058 6.031 6.073 6.068 6.077 6.038 6.021 Thickness 4.242 4.220 4.685 2.420 2.403 2.365 2.406 4.160 4.388 4.256 (mm) L* 94.23 88.92 86.3 94.38 94.5 95.05 95.18 94.17 94.21 94.28 a* −3.04 −2.7 −1.69 −2.33 −2.25 −1.44 −1.19 −1.68 −1.64 −1.63 b* 22.54 45.61 53.12 17.56 16.74 11.04 9.5 15.04 14.7 14.59 Density 2.461 2.461 2.459 2.453 2.449 2.449 2.448 (g/cm.sup.3) Liquidus Temp. (° C.) Example 201 202 203 204 205 206 207 208 209 210 SiO.sub.2 60.539 60.584 60.764 60.726 60.727 60.722 60.582 60.726 60.727 60.722 Al.sub.2O.sub.3 14.803 14.774 14.751 14.753 14.741 14.746 14.729 14.753 14.741 14.746 B.sub.2O.sub.3 6.047 6.048 6.030 6.034 6.034 6.033 6.085 6.034 6.034 6.033 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.025 9.027 8.941 8.947 8.947 8.946 9.005 8.947 8.947 8.946 Na.sub.2O 1.992 2.004 1.980 1.993 2.014 2.003 2.023 1.993 2.014 2.003 K.sub.2O 0.204 0.205 0.204 0.204 0.205 0.201 0.203 0.204 0.205 0.201 MgO 1.492 1.476 1.464 1.466 1.466 1.473 1.662 1.466 1.466 1.473 CaO 4.530 4.511 4.502 4.505 4.498 4.507 4.330 4.505 4.498 4.507 ZnO 0.056 0.051 0.055 0.054 0.056 0.058 0.065 0.054 0.056 0.058 SnO.sub.2 0.014 0.018 0.015 0.018 0.015 0.013 0.014 0.018 0.015 0.013 Fe.sub.2O.sub.3 0.001 0.002 0.002 0.002 0.001 0.001 0.001 0.002 0.001 0.001 TiO.sub.2 0.526 0.526 0.518 0.519 0.514 0.513 0.513 0.519 0.514 0.513 CeO.sub.2 0.768 0.772 0.771 0.775 0.775 0.780 0.783 0.775 0.775 0.780 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.295 1.297 1.289 1.293 1.289 1.293 1.295 1.293 1.289 1.293 R.sub.2O 11.220 11.235 11.125 11.143 11.166 11.149 11.231 11.143 11.166 11.149 Li.sub.2O + Na.sub.2O 11.016 11.030 10.921 10.939 10.960 10.949 11.028 10.939 10.960 10.949 R.sub.2O − Al.sub.2O.sub.3 −3.582 −3.539 −3.626 −3.610 −3.575 −3.596 −3.498 3.610 −3.575 −3.596 R′O 6.077 6.038 6.021 6.025 6.020 6.038 6.057 6.025 6.020 6.038 Thickness 2.417 2.418 2.444 4.380 4.072 4.378 4.870 2.426 2.421 2.347 (mm) L* 95.22 95.18 95.19 94.18 94.14 94.12 94.17 95.15 95.12 95.14 a* −1.16 −1.15 −1.16 −1.65 −1.67 −1.67 −1.67 −1.16 −1.15 −1.13 b* 9.3 9.35 9.39 15.04 15.31 15.34 15.23 9.48 9.53 9.33 Density 2.449 2.448 2.449 2.449 2.448 2.449 2.449 (g/cm.sup.3) Liquidus Temp. (° C.) Example 211 212 213 214 215 216 217 218 219 220 SiO.sub.2 60.582 60.596 60.718 60.784 60.787 60.748 60.743 60.678 60.746 61.209 Al.sub.2O.sub.3 14.729 14.743 14.739 14.704 14.740 14.736 14.755 14.736 14.767 14.903 B.sub.2O.sub.3 6.085 6.072 6.052 5.995 5.981 5.992 5.989 6.019 6.029 6.048 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.005 8.986 8.956 9.047 9.027 9.043 9.039 9.092 9.107 9.136 Na.sub.2O 2.023 2.005 1.996 1.989 1.991 1.995 1.980 1.985 1.995 2.007 K.sub.2O 0.203 0.205 0.201 0.200 0.195 0.198 0.200 0.201 0.200 0.200 MgO 1.662 2.519 3.593 3.986 4.249 4.247 4.344 4.313 4.194 3.537 CaO 4.330 3.495 2.393 1.943 1.685 1.672 1.600 1.613 1.595 1.580 ZnO 0.065 0.059 0.051 0.051 0.046 0.047 0.049 0.053 0.054 0.055 SnO.sub.2 0.014 0.019 0.011 0.013 0.012 0.020 0.011 0.016 0.023 0.019 Fe.sub.2O.sub.3 0.001 0.001 0.002 0.001 0.002 0.002 0.002 0.002 0.002 0.001 TiO.sub.2 0.513 0.513 0.509 0.506 0.506 0.508 0.508 0.506 0.505 0.509 CeO.sub.2 0.783 0.781 0.779 0.770 0.775 0.782 0.775 0.777 0.776 0.790 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.295 1.294 1.288 1.277 1.281 1.290 1.283 1.283 1.282 1.299 R.sub.2O 11.231 11.195 11.154 11.236 11.212 11.236 11.219 11.278 11.303 11.344 Li.sub.2O + Na.sub.2O 11.028 10.991 10.952 11.036 11.017 11.038 11.019 11.077 11.103 11.143 R.sub.2O − Al.sub.2O.sub.3 −3.498 −3.548 −3.585 −3.469 −3.529 −3.500 −3.535 −3.459 −3.464 −3.559 R′O 6.057 6.073 6.037 5.980 5.980 5.966 5.993 5.979 5.844 5.171 Thickness 2.421 4.189 4.423 4.260 4.165 4.146 4.190 4.170 4.180 4.194 (mm) L* 95.13 94.35 94.58 94.8 94.76 94.78 94.75 94.75 94.71 94.51 a* −1.16 −1.72 −1.77 −1.78 −1.83 −1.81 −1.85 −1.82 −1.79 −1.74 b* 9.58 14.79 14.19 13.48 13.89 13.69 14.02 13.79 13.72 14.37 Density 2.448 2.439 2.436 2.436 2.436 (g/cm.sup.3) Liquidus Temp. (° C.) Example 221 222 223 224 225 226 227 228 229 230 SiO.sub.2 61.198 60.698 60.742 60.693 60.701 60.455 60.382 60.392 60.334 60.509 Al.sub.2O.sub.3 14.923 14.833 14.825 14.844 14.835 14.859 14.835 14.829 14.841 14.837 B.sub.2O.sub.3 6.064 5.985 5.976 5.986 5.990 6.176 6.201 6.198 6.203 6.048 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.160 9.918 9.904 9.920 9.927 9.930 9.969 9.966 9.974 9.971 Na.sub.2O 2.012 1.985 1.982 1.983 1.979 1.978 1.994 1.980 1.975 1.973 K.sub.2O 0.206 0.201 0.203 0.199 0.200 0.203 0.206 0.201 0.206 0.203 MgO 3.493 3.468 3.454 3.461 3.090 2.719 1.422 1.269 0.981 0.909 CaO 1.577 1.552 1.547 1.546 1.910 2.307 3.613 3.782 4.101 4.149 ZnO 0.045 0.050 0.049 0.053 0.050 0.054 0.051 0.055 0.059 0.069 SnO.sub.2 0.020 0.022 0.017 0.017 0.014 0.018 0.018 0.020 0.020 0.018 Fe.sub.2O.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 TiO.sub.2 0.512 0.510 0.511 0.512 0.510 0.512 0.520 0.519 0.518 0.520 CeO.sub.2 0.783 0.772 0.784 0.779 0.786 0.782 0.784 0.782 0.785 0.788 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.294 1.281 1.295 1.291 1.296 1.294 1.303 1.302 1.303 1.308 R.sub.2O 11.379 12.104 12.089 12.103 12.106 12.112 12.169 12.147 12.155 12.147 Li.sub.2O + Na.sub.2O 11.173 11.903 11.886 11.904 11.906 11.908 11.963 11.946 11.949 11.943 R.sub.2O − Al.sub.2O.sub.3 −3.544 −2.730 −2.736 −2.741 −2.728 −2.747 −2.666 −2.682 −2.686 −2.691 R′O 5.116 5.070 5.049 5.061 5.051 5.081 5.087 5.106 5.141 5.127 Thickness 4.614 4.276 4.301 5.387 4.217 4.340 4.301 4.267 4.995 4.099 (mm) L* 94.55 94.54 94.45 94.45 94.36 94.19 93.92 93.74 93.84 93.72 a* −1.72 −1.74 −1.76 −1.75 −1.69 −1.72 −1.63 −1.59 −1.58 −1.56 b* 14.15 14.3 14.68 14.51 14.61 15.38 15.74 16.03 16.09 16.23 Density 2.431 2.431 2.431 2.433 2.436 2.442 2.444 2.445 (g/cm.sup.3) Liquidus Temp. (° C.) Example 231 232 233 234 235 236 237 238 239 240 SiO.sub.2 60.571 60.555 60.483 60.662 60.562 60.471 60.403 60.151 60.028 60.072 Al.sub.2O.sub.3 14.776 14.799 14.849 14.790 14.811 14.820 14.761 14.736 14.724 14.661 B.sub.2O.sub.3 6.049 6.051 6.053 5.923 5.924 5.920 5.917 6.009 5.998 5.993 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.972 9.975 9.979 9.994 9.995 9.989 9.983 10.074 10.057 10.048 Na.sub.2O 2.004 1.986 1.988 2.000 1.991 1.995 1.997 1.985 2.043 2.026 K.sub.2O 0.203 0.203 0.203 0.203 0.205 0.204 0.203 0.205 0.205 0.205 MgO 0.824 0.701 0.626 0.597 0.593 0.559 0.524 0.517 0.510 0.516 CaO 4.212 4.348 4.433 4.443 4.476 4.517 4.549 4.555 4.564 4.527 ZnO 0.056 0.055 0.062 0.053 0.052 0.060 0.052 0.036 0.000 0.000 SnO.sub.2 0.022 0.019 0.018 0.022 0.021 0.020 0.015 0.014 0.015 0.009 Fe.sub.2O.sub.3 0.001 0.002 0.002 0.001 0.001 0.002 0.002 0.002 0.006 0.006 TiO 0.518 0.517 0.520 0.519 0.605 0.715 0.955 1.148 1.342 1.510 CeO.sub.2 0.787 0.784 0.783 0.787 0.753 0.717 0.631 0.558 0.484 0.399 ZrO.sub.2 0.011 0.011 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.305 1.301 1.303 1.306 1.359 1.432 1.585 1.705 1.826 1.910 R.sub.2O 12.179 12.164 12.170 12.197 12.191 12.188 12.183 12.264 12.305 12.280 Li.sub.2O + Na.sub.2O 11.976 11.961 11.966 11.994 11.986 11.984 11.980 12.060 12.100 12.074 R.sub.2O − Al.sub.2O.sub.3 −2.597 −2.635 −2.679 −2.592 −2.620 −2.633 −2.578 −2.472 −2.418 −2.381 R′O 5.092 5.104 5.121 5.093 5.122 5.136 5.125 5.108 5.074 5.044 Thickness 4.197 4.298 4.167 4.363 4.125 4.122 4.158 4.281 4.159 3.964 (mm) L* 93.75 93.71 93.64 93.7 93.88 93.95 94.17 94.36 94.69 95.1 a* −1.56 1.55 −1.56 −1.54 −1.69 −1.85 −2.2 −2.45 −2.6 −2.52 b* 16.22 16.4 16.57 16.29 16.68 16.98 17.87 18.42 18.03 16.21 Density 2.444 2.446 2.445 2.446 2.443 2.442 2.441 (g/cm.sup.3) Liquidus Temp. (° C.) Example 241 242 243 244 245 246 247 248 249 250 SiO.sub.2 60.087 60.055 60.095 60.116 60.153 60.168 60.145 60.118 60.140 60.190 Al.sub.2O.sub.3 14.651 14.728 14.688 14.686 14.656 14.675 14.666 14.690 14.688 14.665 B.sub.2O.sub.3 5.989 5.983 5.987 5.984 5.985 5.974 5.973 5.959 5.969 5.961 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 10.042 9.961 9.968 9.963 9.963 9.933 9.931 9.909 9.925 9.926 Na.sub.2O 2.027 2.036 2.031 2.036 2.040 2.032 2.044 2.049 2.032 2.032 K.sub.2O 0.203 0.205 0.206 0.203 0.204 0.203 0.204 0.203 0.201 0.203 MgO 0.518 0.516 0.517 0.517 0.508 0.510 0.511 0.512 0.510 0.506 CaO 4.523 4.545 4.531 4.521 4.510 4.521 4.524 4.535 4.533 4.527 ZnO 0.000 0.000 0.000 0.000 0.001 0.001 0.001 0.000 0.000 0.000 SnO.sub.2 0.012 0.012 0.015 0.017 0.017 0.016 0.028 0.034 0.024 0.020 Fe.sub.2O.sub.3 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 0.006 TiO.sub.2 1.512 1.525 1.531 1.526 1.526 1.536 1.535 1.540 1.539 1.537 CeO.sub.2 0.401 0.398 0.394 0.392 0.398 0.395 0.396 0.402 0.397 0.399 ZrO.sub.2 0.014 0.014 0.015 0.017 0.019 0.015 0.021 0.027 0.020 0.015 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.913 1.923 1.925 1.918 1.924 1.932 1.931 1.943 1.937 1.936 R.sub.2O 12.272 12.202 12.205 12.202 12.207 12.168 12.180 12.161 12.159 12.161 Li.sub.2O + Na.sub.2O 12.069 11.997 11.999 11.999 12.003 11.965 11.975 11.958 11.957 11.958 R.sub.2O − Al.sub.2O.sub.3 −2.379 −2.526 −2.482 −2.484 −2.449 −2.507 −2.486 −2.529 −2.529 −2.504 R′O 5.042 5.061 5.049 5.038 5.019 5.031 5.036 5.048 5.043 5.033 Thickness 3.999 4.433 4.017 4.131 4.050 3.900 3.906 3.979 3.972 4.132 (mm) L* 95.13 95.17 95.14 95.18 95.17 95.16 95.3 95.27 95.2 95.11 a* −2.51 −2.5 −2.51 −2.49 −2.46 −2.49 −2.44 −2.49 −2.46 −2.5 b* 16.02 15.9 15.93 15.76 15.57 15.79 15.18 15.49 15.49 15.87 Density 2.438 2.438 (g/cm.sup.3) Liquidus Temp. (° C.) Example 251 252 253 254 255 256 257 258 259 260 SiO.sub.2 58.199 58.058 58.609 58.469 58.775 58.630 58.676 59.307 58.477 58.759 Al.sub.2O.sub.3 16.223 16.266 16.263 16.460 16.189 16.387 16.250 16.526 16.342 16.414 B.sub.2O.sub.3 5.981 5.921 5.875 5.985 5.920 5.870 5.954 5.580 5.840 5.601 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 12.137 12.097 11.826 11.595 11.599 11.584 11.725 11.691 11.860 11.821 Na.sub.2O 6.086 6.085 6.114 6.176 6.115 6.149 6.084 6.079 6.163 6.141 K.sub.2O 0.189 0.187 0.194 0.189 0.195 0.194 0.194 0.186 0.198 0.193 MgO 0.014 0.011 0.013 0.014 0.014 0.014 0.016 0.014 0.016 0.014 CaO 0.009 0.009 0.005 0.010 0.009 0.009 0.010 0.009 0.013 0.013 ZnO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.002 0.001 0.003 0.003 0.002 0.003 0.003 0.003 0.003 0.004 TiO.sub.2 0.952 0.955 0.987 0.982 0.971 0.982 0.973 0.493 0.977 0.977 CeO.sub.2 0.200 0.400 0.103 0.106 0.199 0.161 0.103 0.102 0.100 0.054 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.152 1.355 1.090 1.088 1.170 1.143 1.076 0.595 1.077 1.031 R.sub.2O 18.412 18.369 18.134 17.960 17.908 17.927 18.003 17.956 18.221 18.155 Li.sub.2O + Na.sub.2O 18.223 18.182 17.940 17.771 17.714 17.733 17.809 17.770 18.022 17.962 R.sub.2O − Al.sub.2O.sub.3 2.190 2.104 1.871 1.500 1.719 1.540 1.753 1.429 1.879 1.742 R′O 0.023 0.020 0.017 0.025 0.024 0.024 0.026 0.024 0.029 0.027 Thickness 1.307 1.336 1.318 1.307 1.336 1.342 1.322 1.343 (mm) L* 95.05 96.71 96.69 96.05 96.61 96.59 96.74 96.66 a* −0.8 −0.26 −0.28 −0.73 −0.44 −0.33 −0.28 −0.14 b* 8.89 1.46 1.5 5.28 2.41 1.41 1.51 1.16 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 261 262 263 264 265 266 267 268 269 270 SiO.sub.2 58.511 58.511 58.538 58.515 58.649 58.452 58.373 58.402 58.367 57.989 Al.sub.2O.sub.3 16.356 16.330 16.277 16.326 16.377 16.319 16.322 16.363 16.369 16.383 B.sub.2O.sub.3 5.827 5.914 6.003 5.950 5.818 5.878 5.951 5.933 5.998 6.042 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 11.808 11.823 11.749 11.818 11.767 11.840 11.791 11.210 10.681 10.423 Na.sub.2O 6.093 6.113 6.125 6.137 6.125 6.101 6.142 5.696 5.193 4.738 K.sub.2O 0.192 0.192 0.194 0.193 0.193 0.192 0.196 0.193 0.195 0.195 MgO 0.013 0.016 0.014 0.016 0.014 0.016 0.019 0.021 0.031 0.035 CaO 0.011 0.011 0.011 0.011 0.011 0.011 0.013 0.978 1.963 2.970 ZnO 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.016 0.016 0.032 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.003 0.003 0.001 Fe.sub.2O.sub.3 0.002 0.004 0.004 0.004 0.004 0.003 0.003 0.003 0.003 0.003 TiO.sub.2 0.976 0.977 0.973 0.972 0.981 0.978 0.978 0.973 0.974 0.975 CeO.sub.2 0.199 0.099 0.100 0.050 0.049 0.200 0.201 0.198 0.201 0.201 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.176 1.076 1.073 1.022 1.030 1.177 1.179 1.171 1.174 1.176 R.sub.2O 18.093 18.128 18.068 18.147 18.085 18.133 18.129 17.099 16.069 15.356 Li.sub.2O + Na.sub.2O 17.901 17.936 17.874 17.954 17.892 17.941 17.933 16.906 15.874 15.161 R.sub.2O − Al.sub.2O.sub.3 1.738 1.799 1.791 1.820 1.708 1.814 1.807 0.736 −0.300 −1.027 R′O 0.024 0.027 0.026 0.027 0.026 0.027 0.032 1.015 2.009 3.037 Thickness 1.347 1.272 1.336 1.274 0.712 0.722 0.692 (mm) L* 95.59 96.76 96.77 96.5 96.48 96.57 96.59 a* −0.76 −0.27 −0.29 −0.59 −0.37 −0.32 −0.28 b* 7.04 1.42 1.52 3.58 2.57 1.68 1.54 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 271 272 273 274 275 276 277 278 279 280 SiO.sub.2 57.677 59.209 59.955 58.314 60.377 59.543 60.528 60.314 61.472 60.280 Al.sub.2O.sub.3 16.598 16.296 16.473 16.409 15.513 15.983 15.053 15.076 14.543 15.163 B.sub.2O.sub.3 6.075 6.018 6.029 5.942 5.928 5.900 5.913 6.022 5.921 5.811 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.908 10.380 9.937 9.702 8.653 8.692 10.037 10.078 9.924 9.955 Na.sub.2O 4.237 4.716 4.177 4.237 1.410 1.522 1.842 1.855 1.831 1.865 K.sub.2O 0.195 0.197 0.193 0.197 0.195 0.194 0.196 0.196 0.193 0.197 MgO 0.045 0.029 0.031 0.044 2.883 5.050 2.025 2.023 1.916 2.022 CaO 4.039 1.960 1.985 3.959 3.826 1.878 2.095 2.114 1.992 2.131 ZnO 0.016 0.016 0.024 0.000 0.000 0.000 1.065 1.073 1.005 1.102 SnO.sub.2 0.002 0.002 0.003 0.000 0.000 0.000 0.002 0.002 0.005 0.003 Fe.sub.2O.sub.3 0.004 0.003 0.003 0.003 0.003 0.003 0.003 0.004 0.004 0.002 TiO.sub.2 0.987 0.969 0.978 0.976 0.993 1.015 1.015 1.015 0.986 1.024 CeO.sub.2 0.203 0.199 0.199 0.202 0.209 0.213 0.216 0.218 0.201 0.424 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.191 1.168 1.177 1.178 1.202 1.228 1.230 1.233 1.187 1.448 R.sub.2O 14.339 15.292 14.307 14.137 10.258 10.407 12.075 12.130 11.948 12.017 Li.sub.2O + Na.sub.2O 14.145 15.096 14.114 13.940 10.063 10.213 11.879 11.933 11.756 11.820 R.sub.2O − Al.sub.2O.sub.3 −2.259 −1.003 −2.166 −2.272 −5.255 −5.576 −2.979 −2.946 −2.594 −3.146 R′O 4.100 2.004 2.039 4.003 6.709 6.928 5.185 5.210 4.913 5.255 Thickness 0.675 0.627 1.378 0.675 1.322 1.332 1.349 1.333 1.343 1.349 (mm) L* 96.59 96.63 96.68 96.59 96.62 96.64 96.6 96.61 96.68 96.25 a* −0.25 −0.23 −0.35 −0.25 −0.33 −0.32 −0.38 −0.38 −0.28 −0.83 b* 1.34 1.29 1.79 1.34 1.63 1.56 1.95 2 1.45 4.74 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 281 282 283 284 285 286 287 288 289 290 SiO.sub.2 61.125 60.995 60.539 60.743 59.214 59.453 61.006 61.358 60.911 60.803 Al.sub.2O.sub.3 14.651 14.714 15.081 14.925 15.593 15.651 14.781 15.141 14.731 14.640 B.sub.2O.sub.3 5.896 5.860 5.892 5.885 6.096 6.051 5.953 5.253 5.980 5.979 P.sub.2O.sub.5 0.000 0.050 0.000 0.000 0.000 0.000 0.000 0.005 0.000 0.050 Li.sub.2O 10.003 9.977 9.977 9.982 10.145 9.941 9.813 9.591 9.903 9.987 Na.sub.2O 1.833 1.840 1.866 1.859 1.807 1.835 1.760 1.798 1.811 1.741 K.sub.2O 0.193 0.190 0.192 0.195 0.176 0.179 0.175 0.184 0.186 0.171 MgO 1.938 1.959 2.011 1.495 2.228 2.243 2.090 2.014 2.007 2.048 CaO 2.029 2.049 2.110 2.094 2.289 2.258 2.136 2.121 2.088 2.133 ZnO 1.017 1.034 1.068 1.591 1.189 1.113 1.072 1.067 1.055 1.133 SnO.sub.2 0.104 0.101 0.002 0.003 0.000 0.000 0.001 0.001 0.102 0.101 Fe.sub.2O.sub.3 0.004 0.004 0.004 0.003 0.004 0.004 0.004 0.002 0.003 0.003 TiO.sub.2 0.994 1.002 1.016 1.007 1.034 1.041 0.995 1.031 1.005 0.993 CeO.sub.2 0.206 0.208 0.214 0.208 0.219 0.218 0.209 0.427 0.210 0.212 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.201 1.210 1.230 1.215 1.253 1.259 1.203 1.458 1.214 1.204 R.sub.2O 12.028 12.007 12.035 12.036 12.128 11.954 11.748 11.573 11.900 11.899 Li.sub.2O + Na.sub.2O 11.835 11.817 11.843 11.841 11.952 11.775 11.572 11.389 11.713 11.728 R.sub.2O − Al.sub.2O.sub.3 −2.623 −2.707 −3.046 −2.889 −3.466 −3.698 −3.034 −3.568 −2.831 −2.741 R′O 4.984 5.042 5.190 5.180 5.705 5.615 5.298 5.202 5.150 5.314 Thickness 1.339 1.371 1.381 1.369 1.354 1.375 1.414 1.411 1.401 1.404 (mm) L* 96.63 96.59 96.64 96.57 96.56 96.59 96.57 96.26 96.6 96.63 a* −0.27 −0.31 −0.29 −0.41 −0.42 −0.41 −0.32 −0.87 −0.32 −0.31 b* 1.67 1.88 1.56 2.15 2.15 2.11 2.01 4.96 1.91 1.83 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 291 292 293 294 295 296 297 298 299 300 SiO.sub.2 59.468 60.460 64.701 64.666 64.271 64.556 64.764 64.074 63.986 63.749 Al.sub.2O.sub.3 15.686 15.286 12.988 12.996 12.892 13.024 12.961 12.946 12.937 12.770 B.sub.2O.sub.3 6.026 5.992 5.829 5.809 5.719 5.828 5.744 5.642 5.779 5.715 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.952 9.668 11.984 12.021 11.714 12.066 10.021 9.964 9.946 9.646 Na.sub.2O 1.796 1.815 2.807 2.803 2.732 2.821 1.837 1.822 1.821 1.783 K.sub.2O 0.178 0.185 0.195 0.196 0.186 0.198 0.196 0.198 0.197 0.188 MgO 2.212 1.561 0.009 0.009 0.008 0.009 0.034 0.030 0.033 0.030 CaO 2.233 2.157 0.009 0.012 0.010 0.010 2.935 2.978 2.964 2.915 ZnO 1.152 1.616 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 SnO.sub.2 0.001 0.000 0.050 0.052 0.044 0.051 0.047 0.049 0.048 0.040 Fe.sub.2O.sub.3 0.004 0.003 0.002 0.002 0.002 0.002 0.003 0.003 0.003 0.003 TiO.sub.2 1.041 1.030 0.980 0.984 0.972 0.981 0.982 0.983 0.976 0.966 CeO.sub.2 0.223 0.219 0.201 0.205 0.200 0.207 0.200 0.203 0.206 0.195 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.264 1.249 1.181 1.188 1.172 1.187 1.182 1.185 1.182 1.161 R.sub.2O 11.926 11.669 14.985 15.020 14.632 15.085 12.053 11.984 11.964 11.617 Li.sub.2O + Na.sub.2O 11.748 11.484 14.791 14.824 14.446 14.887 11.857 11.786 11.767 11.429 R.sub.2O − Al.sub.2O.sub.3 −3.760 3.617 1.997 2.024 1.740 2.061 −0.908 −0.962 −0.974 −1.153 R′O 5.597 5.333 0.018 0.022 0.018 0.019 2.969 3.008 2.997 2.945 Thickness 1.315 1.332 1.263 1.324 1.272 1.261 1.263 1.304 1.321 1.327 (mm) L* 96.66 96.61 96.73 96.77 96.79 96.8 96.77 96.77 96.77 96.78 a* −0.27 −0.41 −0.34 −0.36 −0.34 −0.33 −0.26 −0.28 −0.28 −0.23 b* 1.44 2.11 1.83 1.89 1.81 1.75 1.43 1.51 1.56 1.4 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 301 302 303 304 305 306 307 308 309 310 SiO.sub.2 63.775 62.413 58.673 57.445 59.730 58.759 60.601 61.581 62.137 61.463 Al.sub.2O.sub.3 12.781 14.797 17.014 16.961 16.736 16.344 14.931 14.390 14.227 14.564 B.sub.2O.sub.3 5.553 5.933 5.551 6.208 5.451 6.259 5.818 5.932 5.692 5.707 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.666 8.872 8.827 9.475 8.846 9.693 10.043 9.657 9.644 9.999 Na.sub.2O 1.784 1.356 1.414 1.390 1.407 1.399 1.862 1.852 1.855 1.837 K.sub.2O 0.189 0.003 0.190 0.186 0.193 0.190 0.195 0.195 0.197 0.186 MgO 0.030 2.804 2.224 2.225 2.132 2.070 1.986 1.871 1.894 2.013 CaO 2.932 1.938 4.900 4.803 4.724 4.534 2.068 1.982 1.964 1.994 ZnO 0.000 0.984 0.000 0.000 0.000 0.000 1.044 1.001 0.996 1.022 SnO.sub.2 0.040 0.005 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.003 0.002 0.005 0.004 0.004 0.004 0.002 0.001 0.002 0.003 TiO.sub.2 0.964 0.587 1.079 1.066 0.543 0.518 1.015 0.980 0.983 0.999 CeO.sub.2 0.198 0.303 0.116 0.228 0.225 0.222 0.425 0.552 0.402 0.203 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.162 0.890 1.195 1.294 0.768 0.740 1.441 1.531 1.384 1.202 R.sub.2O 11.639 10.231 10.431 11.051 10.447 11.282 12.100 11.704 11.696 12.023 Li.sub.2O + Na.sub.2O 11.450 10.228 10.241 10.865 10.253 11.092 11.905 11.509 11.499 11.837 R.sub.2O − Al.sub.2O.sub.3 −1.142 −4.566 −6.583 −5.910 −6.289 −5.062 −2.831 −2.686 −2.530 −2.541 R′O 2.961 5.726 7.124 7.028 6.856 6.604 5.099 4.853 4.854 5.029 Thickness 1.28 1.299 1.362 1.335 1.322 (mm) L* 96.79 96.55 96.22 96.11 96.44 a* −0.21 −0.31 −0.87 −0.91 −0.38 b* 1.32 1.69 5.0 5.37 2.02 Density 2.426 (g/cm.sup.3) Liquidus 1140 Temp. (° C.) Example 311 312 313 314 315 316 317 318 319 320 SiO.sub.2 60.804 60.576 60.231 61.469 62.340 61.703 60.724 61.098 62.294 61.677 Al.sub.2O.sub.3 14.714 14.504 14.428 14.810 14.326 14.629 14.698 14.431 14.644 14.862 B.sub.2O.sub.3 5.689 5.677 5.662 5.655 5.495 5.395 5.497 5.644 5.810 5.787 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 10.162 10.324 10.089 10.236 10.071 9.945 9.983 10.156 10.125 10.095 Na.sub.2O 1.841 1.828 1.807 1.873 1.841 1.839 1.829 1.816 1.867 1.902 K.sub.2O 0.187 0.179 0.182 0.191 0.183 0.189 0.189 0.186 0.191 0.191 MgO 2.067 2.025 2.019 2.052 1.960 2.001 2.049 1.991 2.043 2.114 CaO 2.041 2.000 1.995 2.039 1.961 2.024 2.036 1.972 2.007 2.088 ZnO 1.057 1.074 1.083 1.040 1.018 1.043 1.053 1.005 0.994 1.047 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.001 0.002 0.002 0.002 0.004 0.003 TiO.sub.2 1.011 0.991 0.988 0.206 0.394 0.806 1.514 1.490 0.008 0.008 CeO.sub.2 0.416 0.811 1.505 0.417 0.400 0.413 0.416 0.204 0.002 0.210 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 0.002 0.005 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.427 1.802 2.493 0.623 0.794 1.219 1.930 1.694 0.010 0.218 R.sub.2O 12.190 12.332 12.078 12.299 12.096 11.973 12.001 12.158 12.184 12.189 Li.sub.2O + Na.sub.2O 12.002 12.152 11.895 12.108 11.912 11.783 11.811 11.972 11.993 11.998 R.sub.2O − Al.sub.2O.sub.3 −2.524 −2.172 −2.350 −2.510 −2.230 −2.656 −2.697 −2.273 −2.460 −2.673 R′O 5.165 5.099 5.098 5.131 4.939 5.069 5.138 4.968 5.045 5.248 Thickness 1.317 1.3 1.302 1.317 1.306 1.297 1.294 1.306 1.303 1.305 (mm) L* 96.16 95.24 78.05 96.40 96.39 96.26 91.74 96.35 96.69 96.61 a* −0.76 −1.27 1.20 −0.28 −0.34 −0.59 −1.67 −0.67 0.00 −0.11 b* 4.40 9.54 50.71 1.90 2.25 3.50 24.78 3.67 0.20 0.78 Density 2.442 2.46 2.497 2.432 2.437 2.435 2.447 2.434 (g/cm.sup.3) Liquidus 1155 1165 1160 1155 1160 1150 1165 1155 Temp. (° C.) Example 321 322 323 324 325 326 327 328 329 330 SiO.sub.2 61.698 61.353 61.076 61.998 61.764 61.536 61.663 61.249 60.429 61.303 Al.sub.2O.sub.3 14.856 14.696 14.518 14.656 14.822 14.693 14.631 14.539 14.544 14.612 B.sub.2O.sub.3 5.763 5.805 5.715 5.892 5.795 5.770 5.640 5.794 5.777 5.777 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.914 10.046 9.942 10.168 9.987 9.985 9.823 9.855 9.910 9.933 Na.sub.2O 1.896 1.870 1.850 1.874 1.884 1.923 1.896 1.867 1.868 1.888 K.sub.2O 0.193 0.187 0.185 0.187 0.193 0.195 0.194 0.187 0.191 0.189 MgO 2.093 2.078 2.037 2.032 2.085 2.073 2.067 2.058 2.064 2.030 CaO 2.083 2.058 2.036 1.999 2.051 2.018 2.039 2.013 2.029 2.006 ZnO 1.060 1.063 1.094 0.978 0.999 0.998 1.021 1.012 1.021 1.006 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.002 0.001 0.001 0.004 0.004 0.004 0.003 0.001 0.001 0.001 TiO.sub.2 0.007 0.008 0.007 0.199 0.405 0.593 0.593 0.583 0.588 0.198 CeO.sub.2 0.417 0.823 1.527 0.003 0.001 0.198 0.415 0.827 1.565 1.041 ZrO.sub.2 La .sub.2O.sub.3 SO.sub.3 0.002 0.001 0.001 WO.sub.3 Nb.sub.2O.sub.5 0.004 0.003 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 0.424 0.831 1.534 0.202 0.406 0.791 1.008 1.411 2.153 1.238 R.sub.2O 12.004 12.103 11.977 12.229 12.063 12.103 11.913 11.910 11.968 12.011 Li.sub.2O + Na.sub.2O 11.811 11.916 11.792 12.042 11.870 11.908 11.719 11.722 11.778 11.821 R.sub.2O − Al.sub.2O.sub.3 −2.852 −2.593 −2.540 −2.428 −2.759 −2.590 −2.718 −2.629 −2.576 −2.601 R′O 5.237 5.199 5.167 5.010 5.135 5.089 5.126 5.083 5.113 5.042 Thickness 1.3 1.304 1.286 1.309 1.305 1.319 1.328 1.326 1.321 1.314 (mm) L* 96.45 95.83 94.16 96.67 96.73 96.53 96.30 95.50 88.89 95.31 a* −0.22 −0.34 −0.22 −0.01 0.00 −0.20 −0.45 −0.82 −0.98 −0.49 b* 1.63 4.04 8.95 0.21 0.21 1.27 2.86 6.82 21.58 6.20 Density 2.423 2.432 2.457 2.489 2.462 (g/cm.sup.3) Liquidus 1190 1170 1140 1155 1150 Temp. (° C.) Example 331 332 333 334 335 336 337 338 339 340 SiO.sub.2 61.406 60.866 60.079 61.338 62.505 62.054 60.320 62.899 62.147 59.768 Al.sub.2O.sub.3 14.507 14.529 14.559 14.593 14.503 14.478 14.321 14.494 14.610 14.583 B.sub.2O.sub.3 5.685 5.727 5.761 5.850 5.737 5.791 5.779 5.725 5.652 5.703 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.875 9.927 9.953 9.969 8.673 9.182 11.182 9.853 9.914 9.943 Na.sub.2O 1.878 1.870 1.869 1.877 1.855 1.849 1.829 0.390 0.975 3.299 K.sub.2O 0.186 0.186 0.184 0.188 0.191 0.191 0.190 0.190 0.193 0.192 MgO 2.025 2.035 2.043 2.050 2.049 2.031 2.001 2.027 2.042 2.040 CaO 1.999 2.006 2.002 1.994 2.020 1.985 1.964 1.987 2.004 2.018 ZnO 0.993 1.009 1.004 1.002 1.048 1.029 1.011 1.019 1.037 1.029 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.001 0.001 0.001 0.001 0.003 0.003 0.003 0.003 0.003 0.003 TiO.sub.2 0.387 0.781 1.468 0.294 0.999 0.993 0.991 0.996 1.000 0.999 CeO.sub.2 1.039 1.040 1.043 0.834 0.407 0.406 0.400 0.408 0.414 0.408 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 0.004 0.010 0.020 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.426 1.821 2.511 1.128 1.406 1.398 1.391 1.404 1.414 1.407 R.sub.2O 11.939 11.982 12.006 12.034 10.719 11.221 13.200 10.433 11.082 13.434 Li.sub.2O + Na.sub.2O 11.754 11.796 11.822 11.846 10.528 11.031 13.011 10.243 10.889 13.243 R.sub.2O − Al.sub.2O.sub.3 −2.567 −2.547 −2.553 −2.559 −3.784 −3.257 −1.121 −4.061 −3.528 −1.148 R′O 5.017 5.050 5.050 5.045 5.118 5.044 4.976 5.033 5.083 5.088 Thickness 1.316 1.299 1.317 1.328 1.318 1.321 1.358 1.31 1.309 1.314 (mm) L* 94.98 93.05 78.73 95.79 96.36 96.27 96.05 96.35 96.26 95.50 a* −0.71 −1.51 3.11 −0.50 −0.53 0.61 0.87 −0.53 −0.61 −1.11 b* 8.07 15.87 66.05 4.71 2.96 3.51 5.36 2.86 3.37 7.62 Density 2.465 2.463 2.477 2.454 2.434 2.438 2.451 2.43 2.435 2.452 (g/cm.sup.3) Liquidus 1185 1145 1150 1150 Temp. (° C.) Example 341 342 343 344 345 346 347 348 349 350 SiO.sub.2 62.861 63.118 63.125 61.304 61.305 61.386 60.739 60.354 60.167 60.820 Al.sub.2O.sub.3 14.549 14.510 14.461 14.333 14.155 14.179 14.661 14.740 14.708 14.725 B.sub.2O.sub.3 5.958 5.797 5.918 5.931 5.988 5.932 5.856 6.086 6.048 5.857 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 10.097 10.044 10.014 9.879 10.270 10.157 10.088 10.193 10.326 10.041 Na.sub.2O 1.857 1.858 1.850 1.880 1.890 1.868 1.857 1.901 1.944 1.911 K.sub.2O 0.193 0.192 0.190 0.193 0.192 0.194 0.375 0.191 0.197 0.192 MgO 0.030 2.051 1.523 1.999 1.869 1.938 1.988 2.034 2.067 1.972 CaO 2.014 0.023 1.501 2.066 1.968 1.970 2.009 2.066 2.087 2.042 ZnO 1.032 1.011 0.016 1.011 0.977 0.990 1.002 1.007 1.019 0.998 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.003 0.002 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 TiO.sub.2 0.989 0.983 0.988 0.978 0.970 0.968 0.994 1.000 1.002 1.002 CeO.sub.2 0.406 0.404 0.401 0.406 0.397 0.398 0.410 0.410 0.417 0.411 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 0.007 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.396 1.388 1.389 1.384 1.367 1.366 1.404 1.410 1.418 1.414 R.sub.2O 12.147 12.094 12.055 11.953 12.352 12.218 12.319 12.285 12.467 12.144 Li.sub.2O + Na.sub.2O 11.954 11.902 11.864 11.759 12.160 12.024 11.945 12.094 12.269 11.952 R.sub.2O − Al.sub.2O.sub.3 −2.401 −2.416 −2.406 −2.380 1.802 −1.961 −2.342 −2.455 −2.241 −2.582 R′O 3.076 3.084 3.040 5.076 4.814 4.898 4.999 5.107 5.173 5.013 Thickness 1.307 1.318 1.321 1.288 1.298 1.292 1.305 1.299 1.294 1.299 (mm) L* 96.47 96.44 96.39 96.21 96.09 96.06 96.06 96.04 96.11 96.12 a* −0.64 −0.51 −0.56 −0.76 −0.85 −0.87 −0.83 −0.86 −0.79 −0.75 b* 3.59 2.75 3.15 4.47 5.11 5.18 4.90 5.09 4.70 4.50 Density 2.419 2.408 2.402 (g/cm.sup.3) Liquidus Temp. (° C.) Example 351 352 353 354 355 356 357 358 359 360 SiO.sub.2 60.732 60.871 62.547 61.554 63.613 61.314 61.240 61.373 62.031 60.955 Al.sub.2O.sub.3 14.501 14.581 13.795 14.167 14.152 14.505 14.493 14.270 13.888 14.442 B.sub.2O.sub.3 6.170 5.856 5.721 6.035 5.296 5.761 5.742 5.772 5.861 5.942 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 10.077 10.205 10.024 10.419 9.319 9.960 10.022 10.060 10.080 10.205 Na.sub.2O 1.923 1.890 1.723 1.610 1.395 1.888 1.900 2.033 1.887 1.898 K.sub.2O 0.198 0.192 0.191 0.190 0.187 0.190 0.188 0.188 0.196 0.196 MgO 1.964 1.964 1.815 1.861 1.841 1.974 2.007 1.964 1.852 1.975 Cao 2.030 2.016 1.899 1.911 1.928 1.983 1.996 1.964 1.904 1.988 ZnO 0.977 1.008 0.944 0.865 0.905 0.986 0.980 0.976 0.937 0.983 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 TiO.sub.2 0.993 0.986 0.936 0.955 0.949 0.986 0.985 0.966 0.951 0.986 CeO.sub.2 0.413 0.408 0.374 0.381 0.375 0.409 0.410 0.398 0.392 0.411 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 0.011 0.029 0.023 0.025 0.017 0.016 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.406 1.394 1.310 1.336 1.323 1.394 1.395 1.364 1.343 1.396 R.sub.2O 12.198 12.288 11.938 12.218 10.901 12.037 12.110 12.281 12.163 12.299 Li.sub.2O + Na.sub.2O 12.000 12.096 11.748 12.028 10.714 11.847 11.922 12.093 11.967 12.103 R.sub.2O − Al.sub.2O.sub.3 −2.303 −2.293 −1.857 −1.949 −3.251 −2.468 −2.383 −1.989 −1.725 −2.144 R′O 4.971 4.988 4.659 4.637 4.674 4.944 4.984 4.904 4.693 4.946 Thickness 1.295 1.258 1.266 1.241 1.263 1.275 1.268 1.265 1.275 1.287 (mm) L* 96.02 96.13 95.00 94.27 94.24 96.26 96.25 96.25 96.12 96.10 a* −0.76 −0.79 −0.34 −0.15 −0.14 −0.67 −0.69 −0.69 −0.81 −0.80 b* 4.55 4.71 3.46 3.17 3.16 3.89 4.07 4.09 4.88 4.87 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 361 362 363 364 365 366 367 368 369 370 SiO.sub.2 61.158 61.060 60.634 61.106 61.744 61.589 61.061 61.621 61.673 61.634 Al.sub.2O.sub.3 14.319 14.694 14.390 14.826 14.594 14.535 14.435 14.574 14.682 14.321 B.sub.2O.sub.3 6.075 5.747 5.425 5.681 5.710 5.565 5.561 5.555 5.156 5.664 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 10.166 9.815 9.929 10.187 10.079 10.078 9.998 9.954 9.968 10.075 Na.sub.2O 1.885 1.899 1.835 1.894 1.855 1.841 1.842 1.867 1.813 1.880 K.sub.2O 0.193 0.196 0.183 0.191 0.190 0.183 0.186 0.188 0.180 0.187 MgO 1.887 2.059 2.030 2.102 2.034 2.030 2.038 2.016 2.057 2.000 CaO 1.950 2.052 2.037 2.083 2.009 2.004 2.027 2.006 2.031 2.001 ZnO 0.962 1.028 1.059 1.080 0.972 0.966 1.046 1.002 1.004 1.035 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.003 0.003 0.001 0.001 0.004 0.003 0.002 0.002 0.002 0.002 TiO 0.976 1.009 1.466 0.006 0.797 0.992 0.985 0.797 0.603 0.197 CeO.sub.2 0.410 0.422 1.004 0.833 0.001 0.207 0.806 0.409 0.826 1.001 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 0.002 0.009 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.386 1.431 2.470 0.840 0.798 1.199 1.790 1.206 1.429 1.197 R.sub.2O 12.244 11.910 11.947 12.271 12.124 12.101 12.025 12.009 11.961 12.141 Li.sub.2O + Na.sub.2O 12.051 11.714 11.764 12.080 11.934 11.919 11.839 11.821 11.781 11.954 R.sub.2O − Al.sub.2O.sub.3 −2.075 −2.785 −2.443 −2.554 −2.470 −2.433 −2.410 −2.565 −2.721 −2.180 R′O 4.799 5.139 5.125 5.265 5.016 5.001 5.112 5.025 5.092 5.036 Thickness 1.307 1.31 1.361 1.287 1.344 1.337 1.343 1.327 1.348 1.335 (mm) L* 96.08 96.06 76.71 96.21 96.60 96.56 91.80 96.44 96.06 95.80 a* −0.86 −0.86 8.60 −0.17 −0.03 −0.27 −1.71 −0.47 −0.68 −0.36 b* 5.17 5.19 86.33 2.30 0.48 1.43 23.03 2.69 4.71 4.28 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 371 372 373 374 375 376 377 378 379 380 SiO.sub.2 61.677 60.200 60.730 60.788 60.355 62.197 60.801 61.427 61.484 60.057 Al.sub.2O.sub.3 14.558 14.755 14.881 15.062 15.208 14.409 15.150 14.397 14.684 15.049 B.sub.2O.sub.3 5.047 6.116 6.167 6.152 5.901 5.743 6.238 6.058 6.037 6.175 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.853 10.333 10.417 10.130 10.624 9.987 10.105 10.383 10.303 10.407 Na.sub.2O 1.799 1.918 1.973 1.951 1.981 1.899 1.989 1.886 1.928 1.945 K.sub.2O 0.182 0.196 0.195 0.196 0.196 0.197 0.198 0.191 0.197 0.197 MgO 2.023 2.024 2.078 2.082 2.131 1.971 2.133 1.901 2.024 2.100 CaO 2.012 2.029 2.081 2.084 2.094 2.045 2.118 1.948 2.045 2.099 ZnO 1.026 0.994 1.022 1.034 1.029 1.022 1.013 0.958 0.997 1.028 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.002 0.003 0.014 0.065 0.024 0.091 0.016 0.012 0.064 0.063 TiO.sub.2 0.796 0.998 0.008 0.007 0.007 0.008 0.007 0.007 0.007 0.007 CeO.sub.2 1.019 0.419 0.419 0.432 0.433 0.416 0.217 0.818 0.207 0.856 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 0.008 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.816 1.416 0.427 0.439 0.440 0.423 0.225 0.825 0.214 0.863 R.sub.2O 11.834 12.447 12.584 12.277 12.801 12.082 12.292 12.460 12.428 12.549 Li.sub.2O + Na.sub.2O 11.652 12.251 12.389 12.081 12.605 11.885 12.094 12.269 12.231 12.352 R.sub.2O − Al.sub.2O.sub.3 −2.725 −2.309 −2.297 −2.785 −2.407 −2.326 −2.858 −1.936 −2.256 −2.499 R′O 5.061 5.047 5.181 5.201 5.255 5.038 5.264 4.806 5.065 5.227 Thickness 1.334 1.409 1.403 1.389 1.389 1.396 1.38 1.4 1.385 1.397 (mm) L* 95.32 96.15 96.35 96.36 96.17 95.77 96.55 95.64 96.15 95.61 a* −1.27 −0.79 −0.20 −0.18 −0.14 −0.22 −0.06 −0.39 −0.15 −0.32 b* 9.58 4.64 1.71 1.67 1.91 2.31 0.61 4.71 1.14 4.83 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 381 382 383 384 385 386 387 388 389 390 SiO.sub.2 59.613 60.633 61.035 60.100 60.869 60.983 60.730 60.650 62.003 63.308 Al.sub.2O.sub.3 14.360 14.719 14.773 14.452 14.701 14.630 14.721 14.573 13.538 12.544 B.sub.2O.sub.3 5.628 5.754 5.457 5.752 5.759 5.730 5.869 5.768 5.719 5.557 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.937 9.964 10.013 10.067 9.839 9.975 10.077 9.971 10.095 10.014 Na.sub.2O 1.876 1.913 1.925 1.887 1.921 1.867 1.889 1.842 1.902 1.914 K.sub.2O 0.188 0.189 0.194 0.187 0.192 0.193 0.193 0.189 0.192 0.192 MgO 2.027 2.092 2.081 2.033 2.071 2.065 2.100 2.057 2.053 2.021 CaO 2.003 2.069 2.053 2.012 2.043 2.042 2.073 2.032 2.055 2.026 ZnO 1.002 1.026 1.009 0.989 1.010 1.072 1.106 1.074 1.019 1.000 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.002 0.002 0.004 0.002 0.003 0.001 0.001 0.001 0.003 0.003 TiO.sub.2 1.447 0.006 0.990 0.971 0.790 0.606 0.202 0.799 0.989 0.991 CeO.sub.2 1.025 0.843 0.205 0.828 0.417 0.825 1.029 1.027 0.412 0.415 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 0.010 0.002 0.007 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 2.471 0.849 1.195 1.798 1.207 1.430 1.231 1.826 1.401 1.407 R.sub.2O 12.001 12.066 12.131 12.141 11.952 12.035 12.159 12.003 12.190 12.120 Li.sub.2O + Na.sub.2O 11.813 11.877 11.938 11.954 11.760 11.842 11.966 11.814 11.998 11.927 R.sub.2O − Al.sub.2O.sub.3 −2.359 −2.653 −2.642 −2.311 −2.749 −2.594 −2.562 −2.570 −1.349 −0.424 R′O 5.032 5.188 5.143 5.034 5.124 5.179 5.279 5.163 5.128 5.046 Thickness 1.208 1.187 1.205 1.217 1.221 1.301 1.308 1.294 1.33 1.305 (mm) L* 75.42 95.92 96.39 90.40 96.13 95.26 95.24 93.27 95.86 94.41 a* 5.59 −0.29 −0.37 1.24 −0.60 −0.86 −0.49 −1.13 −0.98 −1.42 b* 71.57 3.76 2.56 24.31 4.30 8.13 6.74 15.33 6.22 12.10 Density 2.439 2.431 (g/cm.sup.3) Liquidus 1160 1170 Temp. (° C.) Example 391 392 393 394 395 396 397 398 399 400 SiO.sub.2 63.846 61.725 61.403 61.676 62.297 62.861 64.138 60.358 61.846 59.290 Al.sub.2O.sub.3 11.995 13.120 12.434 11.536 14.470 14.471 14.495 14.603 13.810 15.265 B.sub.2O.sub.3 5.535 5.839 5.796 5.627 4.743 3.915 2.828 6.123 6.166 5.972 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 10.169 10.534 11.632 12.150 10.019 10.236 10.024 10.395 10.165 10.420 Na.sub.2O 1.960 2.056 2.169 2.375 1.894 1.891 1.886 1.896 1.876 1.990 K.sub.20 0.190 0.193 0.189 0.188 0.192 0.192 0.193 0.194 0.192 0.196 MgO 1.956 2.054 2.002 2.020 1.992 2.015 2.016 2.014 1.808 2.186 CaO 1.975 2.045 1.985 2.013 1.996 2.009 2.014 2.019 1.876 2.130 ZnO 0.969 1.004 0.978 0.992 0.986 0.995 0.991 0.984 0.908 1.047 SnO.sub.2 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.003 0.013 0.040 TiO.sub.2 0.978 0.998 0.980 0.988 0.982 0.983 0.984 0.985 0.936 1.016 CeO.sub.2 0.407 0.410 0.409 0.416 0.410 0.412 0.411 0.412 0.391 0.434 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 0.002 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.385 1.408 1.389 1.404 1.392 1.395 1.395 1.398 1.327 1.450 R.sub.2O 12.320 12.783 13.991 14.713 12.104 12.320 12.103 12.486 12.233 12.606 Li.sub.2O + Na.sub.2O 12.130 12.590 13.802 14.525 11.912 12.128 11.910 12.292 12.042 12.410 R.sub.2O − Al.sub.2O.sub.3 0.325 −0.337 1.556 3.177 −2.366 −2.151 −2.391 −2.117 −1.577 −2.660 R′O 4.900 5.103 4.966 5.025 4.974 5.019 5.021 5.017 4.591 5.364 Thickness 1.334 1.325 1.336 1.329 1.343 1.336 1.334 1.287 1.282 1.293 (mm) L* 94.98 95.45 95.91 96.06 95.96 95.97 95.97 96.09 96.11 95.96 a* −1.33 −1.15 1.00 −0.81 −0.87 −0.84 −0.91 −0.79 −0.74 −0.73 b* 10.46 8.02 6.34 4.98 5.43 5.27 5.73 4.71 4.51 4.83 Density 2.432 2.44 2.448 2.455 2.442 2.445 2.45 (g/cm.sup.3) Liquidus 1135 1160 1165 1135 1195 1215 1245 Temp. (° C.) Example 401 402 403 404 405 406 407 408 409 410 SiO.sub.2 59.744 59.186 60.509 60.421 60.579 60.333 61.608 63.053 61.230 61.869 Al.sub.2O.sub.3 15.020 15.187 14.713 14.848 14.672 15.126 14.624 13.534 14.809 14.514 B.sub.2O.sub.3 6.099 6.202 5.894 5.827 6.032 6.294 5.872 6.222 5.827 5.947 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 10.340 10.557 10.257 10.063 10.197 10.361 9.941 10.267 10.019 10.253 Na.sub.2O 1.911 1.926 1.879 1.919 1.842 1.858 1.868 1.772 1.863 1.825 K.sub.2O 0.194 0.194 0.191 0.192 0.193 0.192 0.196 0.196 0.198 0.191 MgO 2.099 2.166 2.033 2.090 2.000 2.176 2.046 1.735 2.036 1.937 CaO 2.060 2.086 2.043 2.081 2.018 2.085 1.995 1.816 2.051 1.965 ZnO 1.021 1.010 1.003 1.026 1.046 1.069 1.024 0.950 1.051 1.024 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.064 0.023 0.056 0.090 0.003 0.002 0.002 0.002 0.002 0.002 TiO.sub.2 1.009 1.012 0.991 1.000 1.006 0.012 0.011 0.011 0.011 0.011 CeO.sub.2 0.425 0.433 0.417 0.423 0.407 0.426 0.410 0.379 0.421 0.396 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 0.004 0.006 0.009 0.007 0.049 WO.sub.3 0.052 0.396 Nb.sub.2O.sub.5 0.049 0.423 Bi.sub.2O.sub.3 0.001 0.059 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.434 1.446 1.408 1.423 1.413 0.438 0.421 0.390 0.433 0.407 R.sub.2O 12.445 12.677 12.327 12.174 12.232 12.410 12.006 12.235 12.081 12.268 Li.sub.2O + Na.sub.2O 12.252 12.483 12.136 11.982 12.039 12.219 11.810 12.039 11.883 12.078 R.sub.2O − Al.sub.2O.sub.3 −2.575 −2.510 −2.386 −2.674 −2.441 −2.716 −2.619 −1.299 −2.728 −2.246 R′O 5.180 5.263 5.079 5.196 5.064 5.330 5.064 4.501 5.138 4.925 Thickness 1.287 1.342 1.37 1.345 1.31 1.301 1.293 1.307 1.284 1.277 (mm) L* 95.79 95.98 95.92 95.15 96.09 96.36 96.41 96.33 96.20 96.38 a* −0.72 −0.81 −0.70 −0.79 −0.80 −0.23 −0.27 −0.25 −0.41 −0.22 b* 5.53 5.05 5.12 7.39 4.80 1.80 1.84 1.90 2.50 1.74 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 411 412 413 414 415 416 417 418 419 420 SiO.sub.2 59.713 61.525 61.538 58.525 60.939 60.714 60.727 61.761 61.367 60.720 Al.sub.2O.sub.3 15.337 14.475 14.604 16.084 14.420 14.467 15.292 14.234 14.109 14.621 B.sub.2Og 6.242 6.186 5.924 5.610 6.037 6.081 5.891 6.159 5.959 5.925 P.sub.2O.sub.5 0.000 0.000 0.000 0.002 0.026 0.050 0.027 0.049 0.002 0.002 Li.sub.2O 10.607 10.347 10.039 10.018 10.108 10.056 10.045 10.377 10.291 10.116 Na.sub.2O 1.892 1.864 1.877 2.003 1.879 1.898 1.965 1.900 1.877 1.915 K.sub.2O 0.179 0.195 0.192 0.199 0.192 0.193 0.194 0.190 0.191 0.195 MgO 2.128 1.943 2.024 2.554 1.958 1.997 2.152 1.909 1.876 1.994 CaO 1.961 1.975 1.978 2.298 1.999 2.037 2.141 1.940 1.931 2.048 ZnO 1.038 1.016 0.987 1.168 0.978 0.985 1.046 0.949 0.955 0.987 SnO.sub.2 0.000 0.000 0.000 0.002 0.048 0.097 0.051 0.097 0.053 0.053 Fe.sub.2O.sub.3 0.003 0.002 0.002 0.003 0.003 0.003 0.003 0.003 0.003 0.003 TiO.sub.2 0.010 0.011 0.012 1.060 0.983 0.988 0.007 0.006 0.968 0.993 CeO.sub.2 0.387 0.408 0.411 0.458 0.413 0.416 0.441 0.407 0.402 0.412 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 0.002 0.017 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 0.500 MoO.sub.3 0.045 0.381 CeO.sub.2 + TiO.sub.2 0.397 0.420 0.423 1.518 1.396 1.403 0.448 0.413 1.370 1.405 R.sub.2O 12.678 12.405 12.108 12.219 12.178 12.147 12.205 12.468 12.359 12.226 Li.sub.2O + Na.sub.2O 12.499 12.211 11.916 12.020 11.987 11.954 12.011 12.278 12.168 12.031 R.sub.2O − Al.sub.2O.sub.3 −2.659 −2.070 −2.496 −3.865 −2.242 −2.320 −3.088 −1.766 −1.750 −2.395 R′O 5.126 4.934 4.989 6.020 4.935 5.019 5.339 4.799 4.763 5.029 Thickness 1.297 1.328 1.333 1.348 1.335 1.341 1.355 1.346 1.354 1.35 (mm) L* 96.30 96.38 96.41 96.11 96.19 96.39 96.46 96.52 96.19 96.20 a* −0.28 −0.23 −0.28 −0.80 −0.74 −0.57 −0.11 −0.06 −0.69 −0.72 b* 1.96 1.78 2.02 4.64 4.25 3.12 1.06 0.71 4.05 4.18 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 421 422 423 424 425 426 427 428 429 430 SiO.sub.2 59.486 60.630 60.210 60.621 60.457 61.483 60.402 62.960 61.721 64.109 Al.sub.2O.sub.3 15.281 14.950 15.185 14.934 15.052 14.394 15.135 13.779 14.375 13.328 B.sub.2O.sub.3 6.085 5.820 5.908 5.873 5.911 5.920 5.788 5.728 5.972 5.796 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 9.288 9.005 9.134 9.094 9.147 9.097 9.535 9.781 9.879 10.038 Na.sub.2O 1.521 1.367 1.359 1.842 1.841 1.828 1.358 1.647 1.367 1.455 K.sub.2O 0.194 0.166 0.165 0.165 0.162 0.167 0.168 0.165 0.166 0.166 MgO 5.002 4.692 4.755 4.560 4.693 4.289 3.108 3.321 3.897 2.914 CaO 1.759 1.936 1.840 1.487 1.511 1.420 3.059 1.196 1.204 0.790 ZnO 0.000 0.008 0.008 0.008 0.008 0.000 0.016 0.016 0.008 0.008 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.001 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 TiO.sub.2 0.976 1.011 1.016 0.997 0.803 1.080 1.012 0.999 0.998 0.990 CeO.sub.2 0.398 0.413 0.419 0.418 0.413 0.320 0.418 0.408 0.411 0.405 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.374 1.424 1.434 1.414 1.216 1.400 1.429 1.406 1.408 1.395 R.sub.2O 11.004 10.538 10.658 11.102 11.150 11.091 11.061 11.593 11.413 11.659 Li.sub.2O + Na.sub.2O 10.809 10.372 10.494 10.937 10.988 10.925 10.893 11.428 11.246 11.493 R.sub.2O − Al.sub.2O.sub.3 −4.277 −4.411 −4.527 −3.832 −3.902 −3.303 −4.074 −2.186 −2.963 −1.669 R′O 6.761 6.636 6.602 6.054 6.212 5.709 6.182 4.532 5.109 3.712 Thickness 0.57 1.295 1.282 1.309 1.305 1.301 1.277 1.289 1.287 1.286 (mm) L* 96.38 96.34 96.35 96.38 96.37 96.39 96.34 96.28 96.35 96.29 a* −0.29 −0.57 −0.53 −0.52 −0.47 −0.52 −0.52 −0.65 −0.58 −0.68 b* 1.68 3.13 2.92 2.88 2.63 2.80 2.98 3.83 3.28 3.91 Density (g/cm.sup.3) Liquidus 1140 Temp. (° C.) Example 431 432 433 434 435 436 437 438 439 440 SiO.sub.2 59.283 59.636 59.706 59.455 59.392 59.737 59.476 59.673 59.593 60.312 Al.sub.2O.sub.3 14.546 14.386 14.531 14.696 14.568 14.718 14.658 14.710 14.781 14.488 B.sub.2O.sub.3 4.841 4.902 4.734 4.835 4.826 4.789 4.812 4.734 4.864 5.668 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 13.885 13.143 11.778 12.419 8.785 10.985 13.119 11.672 12.316 9.953 Na.sub.2O 0.879 0.864 2.169 0.872 5.816 0.858 0.870 2.187 0.870 1.822 K.sub.2O 0.171 0.814 0.765 1.309 0.166 2.465 0.811 0.775 1.286 0.166 MgO 2.026 1.939 1.998 2.030 2.064 2.040 2.060 2.044 2.062 2.000 CaO 1.987 1.958 1.970 2.002 2.002 2.010 2.015 2.010 2.031 1.999 ZnO 0.972 0.951 0.940 0.958 0.975 0.971 0.965 0.973 0.972 1.083 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.003 0.003 0.003 0.002 TiO.sub.2 0.997 0.994 0.997 1.010 0.997 1.015 1.008 1.012 1.014 1.485 CeO.sub.2 0.411 0.410 0.410 0.412 0.407 0.410 0.205 0.206 0.206 1.014 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.408 1.404 1.407 1.422 1.404 1.425 1.213 1.218 1.221 2.499 R.sub.2O 14.935 14.821 14.712 14.600 14.767 14.308 14.799 14.634 14.472 11.940 Li.sub.2O + Na.sub.2O 14.764 14.007 13.947 13.291 14.601 11.843 13.989 13.859 13.186 11.775 R.sub.2O − Al.sub.2O.sub.3 0.388 0.435 0.181 −0.096 0.199 −0.411 0.142 −0.075 −0.310 −2.548 R′O 4.985 4.849 4.908 4.990 5.041 5.021 5.039 5.028 5.065 5.081 Thickness 1.221 1.223 1.217 1.17 1.227 1.237 1.281 1.253 1.24 1.352 (mm) L* 96.03 96.00 95.41 95.90 94.89 92.22 96.32 96.29 96.34 70.36 a* −0.78 −0.83 −1.06 −0.92 −1.28 −1.52 −0.47 −0.55 −0.46 8.58 b* 4.89 5.26 7.73 5.69 10.18 19.29 2.37 2.51 2.52 76.71 Density 2.447 2.448 2.453 2.447 2.46 2.447 2.436 2.444 2.437 (g/cm.sup.3) Liquidus Temp. (° C.) Example 441 442 443 444 445 446 447 448 449 450 SiO.sub.2 61.349 62.180 61.549 60.736 61.636 61.225 61.051 60.582 59.100 59.100 Al.sub.2O.sub.3 14.663 14.334 14.333 14.536 14.206 14.525 14.611 14.511 14.500 14.500 B.sub.2O.sub.3 5.943 5.761 5.893 5.760 5.984 5.717 5.837 5.949 5.000 5.000 P.sub.2O.sub.5 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Li.sub.2O 10.028 10.030 10.084 10.028 10.114 10.038 10.118 10.011 13.800 12.396 Na.sub.2O 1.861 1.868 1.850 1.837 1.858 1.841 1.860 1.819 1.000 2.404 K.sub.2O 0.168 0.168 0.165 0.165 0.168 0.167 0.165 0.160 0.200 0.200 MgO 2.051 1.965 1.982 2.028 1.945 2.018 2.031 2.052 3.000 2.579 CaO 2.029 1.943 1.954 2.013 1.929 2.003 2.023 2.009 0.500 1.202 ZnO 1.061 0.948 0.994 1.071 0.973 1.046 1.072 1.095 1.500 1.219 SnO.sub.2 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 TiO.sub.2 0.010 0.790 0.978 0.995 0.778 0.598 0.199 0.788 1.000 1.000 CeO.sub.2 0.826 0.001 0.206 0.815 0.395 0.813 1.024 1.013 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 0.837 0.791 1.184 1.810 1.173 1.412 1.223 1.801 1.400 1.400 R.sub.2O 12.057 12.066 12.099 12.030 12.140 12.046 12.143 11.990 15.000 15.000 Li.sub.2O + Na.sub.2O 11.889 11.898 11.934 11.865 11.972 11.879 11.978 11.830 14.800 14.800 R.sub.2O − Al.sub.2O.sub.3 −2.606 −2.268 −2.234 −2.506 −2.066 −2.479 −2.468 −2.520 0.500 0.500 R′O 5.142 4.856 4.930 5.113 4.848 5.067 5.125 5.157 5.000 5.000 Thickness 1.372 1.367 1.383 1.358 1.388 1.377 1.364 1.159 (mm) L* 95.90 96.57 96.46 89.22 96.26 95.55 95.29 94.42 a* −0.31 −0.01 −0.33 −1.81 −0.57 −0.83 −0.52 −1.22 b* 3.62 0.35 1.84 28.72 3.37 6.58 6.23 11.32 Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 451 452 453 454 455 456 457 458 459 460 SiO.sub.2 59.100 59.100 59.100 59.100 59.100 59.100 59.100 59.100 59.100 59.100 Al.sub.2O.sub.3 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 B.sub.2O.sub.3 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 P.sub.2O.sub.5 Li.sub.2O 13.026 11.341 11.765 12.437 10.270 10.737 11.184 11.835 8.800 9.423 Na.sub.2O 1.000 3.459 2.314 1.000 4.530 3.338 2.328 1.000 6.000 4.585 K.sub.2O 0.974 0.200 0.921 1.563 0.200 0.926 1.488 2.165 0.200 0.993 MgO 2.309 2.262 1.962 1.783 1.941 1.651 1.452 1.246 1.500 1.217 CaO 0.777 1.730 1.414 0.987 2.265 1.928 1.624 1.202 3.000 2.575 ZnO 1.915 1.008 1.623 2.230 0.794 1.421 1.924 2.552 0.500 1.208 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 R.sub.2O 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 Li.sub.2O + Na.sub.2O 14.026 14.800 14.079 13.437 14.800 14.074 13.512 12.835 14.800 14.007 R.sub.2O − Al.sub.2O.sub.3 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 R′O 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 461 462 463 464 465 466 467 468 469 470 SiO.sub.2 59.100 59.100 59.100 61.100 61.100 61.100 61.100 61.100 61.100 61.100 Al.sub.2O.sub.3 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 B.sub.2O.sub.3 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 P.sub.2O.sub.5 Li.sub.2O 9.889 10.358 11.000 11.960 10.749 11.277 9.835 10.196 10.764 8.907 Na.sub.2O 3.526 2.458 1.000 0.870 2.081 0.870 2.995 1.997 0.870 3.923 K.sub.2O 1.585 2.184 3.000 0.170 0.170 0.853 0.170 0.807 1.366 0.170 MgO 1.005 0.792 0.500 2.000 2.000 2.000 2.000 2.000 2.000 2.000 CaO 2.258 1.937 1.500 2.000 2.000 2.000 2.000 2.000 2.000 2.000 ZnO 1.737 2.271 3.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 R.sub.2O 15.000 15.000 15.000 13.000 13.000 13.000 13.000 13.000 13.000 13.000 Li.sub.2O + Na.sub.2O 13.415 12.816 12.000 12.830 12.830 12.147 12.830 12.193 11.634 12.830 R.sub.2O − Al.sub.2O.sub.3 0.500 0.500 0.500 −1.500 −1.500 −1.500 −1.500 −1.500 −1.500 −1.500 R′O 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 471 472 473 474 475 476 477 478 479 480 SiO.sub.2 61.100 61.100 61.100 61.100 61.100 61.100 61.100 61.100 63.100 63.100 Al.sub.2O.sub.3 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 B.sub.2O.sub.3 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 P.sub.2O.sub.5 Li.sub.2O 9.311 9.693 10.243 7.630 8.178 8.583 8.987 9.530 10.120 9.072 Na.sub.2O 2.878 2.004 0.870 5.200 3.950 3.028 2.108 0.870 0.730 1.778 K.sub.2O 0.812 1.303 1.887 0.170 0.871 1.389 1.905 2.600 0.150 0.150 MgO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 CaO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 ZnC 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 R.sub.2O 13.000 13.000 13.000 13.000 13.000 13.000 13.000 13.000 11.000 11.000 Li.sub.2O + Na.sub.2O 12.188 11.697 11.113 12.830 12.129 11.611 11.095 10.400 10.850 10.850 R.sub.2O − Al.sub.2O.sub.3 −1.500 −1.500 −1.500 −1.500 −1.500 −1.500 −1.500 −1.500 −3.500 −3.500 R′O 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 481 482 483 484 485 486 487 488 489 490 Al.sub.2O.sub.3 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 B.sub.2O.sub.3 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 P.sub.2O.sub.5 Li.sub.2O 9.537 8.293 8.609 9.102 7.511 7.859 8.189 8.665 6.450 6.914 Na.sub.2O 0.730 2.557 1.701 0.730 3.339 2.450 1.704 0.730 4.400 3.350 K.sub.2O 0.733 0.150 0.690 1.168 0.150 0.691 1.107 1.605 0.150 0.737 MgO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 CaO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 ZnO 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 R.sub.2O 11.000 11.000 11.000 11.000 11.000 11.000 11.000 11.000 11.000 11.000 Li.sub.2O + Na.sub.2O 10.267 10.850 10.310 9.832 10.850 10.309 9.893 9.395 10.850 10.263 R.sub.2O − Al.sub.2O.sub.3 −3.500 −3.500 −3.500 −3.500 −3.500 −3.500 −3.500 −3.500 −3.500 −3.500 R′O 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 491 492 493 494 495 496 497 498 499 500 SiO.sub.2 63.100 63.100 63.100 61.100 61.100 61.100 61.100 61.100 61.100 61.100 Al.sub.2O.sub.3 14.500 14.500 14.500 12.500 12.500 12.500 12.500 12.500 12.500 12.500 B.sub.2O.sub.3 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 P.sub.2O.sub.5 Li.sub.2O 7.258 7.603 8.070 13.800 12.383 13.009 11.324 11.749 12.417 10.256 Na.sub.2O 2.570 1.788 0.730 1.000 2.417 1.000 3.476 2.317 1.000 4.544 K.sub.2O 1.172 1.609 2.200 0.200 0.200 0.991 0.200 0.934 1.583 0.200 MgO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 CaO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 ZnO 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 R.sub.2O 11.000 11.000 11.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 Li.sub.2O + Na.sub.2O 9.828 9.391 8.800 14.800 14.800 14.009 14.800 14.066 13.417 14.800 R.sub.2O − Al.sub.2O.sub.3 −3.500 −3.500 −3.500 2.500 2.500 2.500 2.500 2.500 2.500 2.500 R′O 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 501 502 503 504 505 506 507 508 509 510 SiO.sub.2 61.100 61.100 61.100 61.100 61.100 61.100 61.100 61.100 61.100 61.100 Al.sub.2O.sub.3 12.500 12.500 12.500 12.500 12.500 12.500 12.500 12.500 14.500 14.500 B.sub.2O.sub.3 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 P.sub.2O.sub.5 Li.sub.2O 10.727 11.173 11.818 8.800 9.430 9.897 10.366 11.000 13.800 12.394 Na.sub.2O 3.336 2.323 1.000 6.000 4.568 3.506 2.441 1.000 1.000 2.406 K.sub.2O 0.937 1.504 2.182 0.200 1.002 1.597 2.193 3.000 0.200 0.200 MgO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 1.800 1.547 CaO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 0.300 0.722 ZnO 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 0.900 0.731 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 R.sub.2O 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 Li.sub.2O + Na.sub.2O 14.063 13.496 12.818 14.800 13.998 13.403 12.807 12.000 14.800 14.800 R.sub.2O − Al.sub.2O.sub.3 2.500 2.500 2.500 2.500 2.500 2.500 2.500 2.500 0.500 0.500 R′O 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 3.000 3.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 511 512 513 514 515 516 517 518 519 520 SiO.sub.2 61.100 61.100 61.100 61.100 61.100 61.100 61.100 61.100 61.100 61.100 Al.sub.2O.sub.3 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 B.sub.2O.sub.3 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 P.sub.2O.sub.5 Li.sub.2O 13.013 11.337 11.759 12.421 10.267 10.736 11.180 11.822 8.800 9.432 Na.sub.2O 1.000 3.463 2.309 1.000 4.533 3.328 2.317 1.000 6.000 4.564 K.sub.2O 0.987 0.200 0.932 1.579 0.200 0.937 1.502 2.178 0.200 1.004 MgO 1.378 1.357 1.172 1.061 1.164 0.986 0.865 0.740 0.900 0.728 CaO 0.469 1.039 0.850 0.595 1.360 1.156 0.974 0.724 1.800 1.542 ZnO 1.153 0.604 0.978 1.343 0.476 0.858 1.161 1.536 0.300 0.731 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 R.sub.2O 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 Li.sub.2O + Na.sub.2O 14.013 14.800 14.068 13.421 14.800 14.063 13.498 12.822 14.800 13.996 R.sub.2O − Al.sub.2O.sub.3 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 R′O 3.000 3.000 3.000 3.000 3.000 3.000 3.000 3.000 3.000 3.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 521 522 523 524 525 526 527 528 529 530 SiO.sub.2 61.100 61.100 61.100 63.100 63.100 63.100 63.100 63.100 63.100 63.100 Al.sub.2O.sub.3 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 B.sub.2O.sub.3 5.000 5.000 5.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 P.sub.2O.sub.5 Li.sub.2O 9.899 10.368 11.000 13.800 12.391 13.015 11.334 11.757 12.424 10.264 Na.sub.2O 3.501 2.437 1.000 1.000 2.409 1.000 3.466 2.313 1.000 4.536 K.sub.2O 1.599 2.195 3.000 0.200 0.200 0.985 0.200 0.930 1.576 0.200 MgO 0.600 0.472 0.300 2.000 2.000 2.000 2.000 2.000 2.000 2.000 CaO 1.350 1.159 0.900 2.000 2.000 2.000 2.000 2.000 2.000 2.000 ZnO 1.050 1.369 1.800 1.000 1.000 1.000 1.000 1.000 1.000 1.000 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 R.sub.2O 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 Li.sub.2O + Na.sub.2O 13.401 12.805 12.000 14.800 14.800 14.015 14.800 14.070 13.424 14.800 R.sub.2O − Al.sub.2O.sub.3 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 R′O 3.000 3.000 3.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 531 532 533 534 535 536 537 538 539 540 SiO.sub.2 63.100 63.100 63.100 63.100 63.100 63.100 63.100 63.100 55.100 55.100 Al.sub.2O.sub.3 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 B.sub.2O.sub.3 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 9.000 9.000 P.sub.2O.sub.5 Li.sub.2O 10.733 11.179 11.824 8.800 9.429 9.896 10.364 11.000 13.800 12.391 Na.sub.2O 3.333 2.322 1.000 6.000 4.571 3.510 2.444 1.000 1.000 2.409 K.sub.2O 0.934 1.499 2.176 0.200 1.000 1.595 2.191 3.000 0.200 0.200 MgO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 CaO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 ZnO 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 R.sub.2O 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 Li.sub.2O + Na.sub.2O 14.066 13.501 12.824 14.800 14.000 13.405 12.809 12.000 14.800 14.800 R.sub.2O − Al.sub.2O.sub.3 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 R′O 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 541 542 543 544 545 546 547 548 549 550 SiO.sub.2 55.100 55.100 55.100 55.100 55.100 55.100 55.100 55.100 55.100 55.100 Al.sub.2O.sub.3 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 14.500 B.sub.2O.sub.3 9.000 9.000 9.000 9.000 9.000 9.000 9.000 9.000 9.000 9.000 P.sub.2O.sub.5 Li.sub.2O 13.016 11.333 11.757 12.425 10.264 10.732 11.179 11.825 8.800 9.428 Na.sub.2O 1.000 3.467 2.314 1.000 4.536 3.335 2.323 1.000 6.000 4.573 K.sub.2O 0.984 0.200 0.929 1.575 0.200 0.933 1.498 2.175 0.200 0.999 MgO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 CaO 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 ZnO 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 R.sub.2O 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 15.000 Li.sub.2O + Na.sub.2O 14.016 14.800 14.071 13.425 14.800 14.067 13.502 12.825 14.800 14.001 R.sub.2O − Al.sub.2O.sub.3 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 R′O 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 5.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 551 552 553 554 555 556 557 558 559 560 SiO.sub.2 55.100 55.100 55.100 60.700 60.700 60.700 60.700 60.700 60.700 60.700 Al.sub.2O.sub.3 14.500 14.500 14.500 14.700 14.700 14.700 14.700 14.700 14.700 14.700 B.sub.2O.sub.3 9.000 9.000 9.000 6.000 6.000 6.000 6.000 6.000 6.000 6.000 P.sub.2O.sub.5 Li.sub.2O 9.895 10.364 11.000 9.000 9.000 9.000 9.000 9.000 9.000 9.000 Na.sub.2O 3.511 2.446 1.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 K.sub.2O 1.594 2.190 3.000 0.200 0.200 0.200 0.200 0.200 0.200 0.200 MgO 2.000 2.000 2.000 5.500 4.060 4.357 2.996 3.112 3.508 1.933 CaO 2.000 2.000 2.000 0.500 1.940 0.786 3.004 2.097 0.998 4.067 ZnO 1.000 1.000 1.000 0.000 0.000 0.857 0.000 0.791 1.494 0.000 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 R.sub.2O 15.000 15.000 15.000 11.200 11.200 11.200 11.200 11.200 11.200 11.200 Li.sub.2O + Na.sub.2O 13.406 12.810 12.000 11.000 11.000 11.000 11.000 11.000 11.000 11.000 R.sub.2O − Al.sub.2O.sub.3 0.500 0.500 0.500 −3.500 −3.500 −3.500 −3.500 −3.500 −3.500 −3.500 R′O 5.000 5.000 5.000 6.000 6.000 6.000 6.000 6.000 6.000 6.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 561 562 563 564 565 566 567 568 569 570 SiO.sub.2 60.700 60.700 60.700 60.700 60.700 60.700 60.700 60.700 60.700 60.804 Al.sub.2O.sub.3 14.700 14.700 14.700 14.700 14.700 14.700 14.700 14.700 14.700 14.704 B.sub.2O.sub.3 6.000 6.000 6.000 6.000 6.000 6.000 6.000 6.000 6.000 6.002 P.sub.2O.sub.5 Li.sub.2O 9.000 9.000 9.000 9.000 9.000 9.000 9.000 9.000 9.000 9.003 Na.sub.2O 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.001 K.sub.2O 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 MgO 2.091 2.298 2.655 0.500 0.785 0.997 1.210 1.500 4.500 3.634 CaO 3.118 2.302 1.211 5.500 4.360 3.511 2.658 1.500 1.500 2.368 ZnO 0.791 1.400 2.133 0.000 0.855 1.492 2.131 3.000 SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 0.885 CeO.sub.2 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.400 1.285 R.sub.2O 11.200 11.200 11.200 11.200 11.200 11.200 11.200 11.200 11.200 11.203 Li.sub.2O + Na.sub.2O 11.000 11.000 11.000 11.000 11.000 11.000 11.000 11.000 11.000 11.003 R.sub.2O − Al.sub.2O.sub.3 −3.500 −3.500 −3.500 3.500 −3.500 −3.500 −3.500 −3.500 −3.500 −3.501 R′O 6.000 6.000 6.000 6.000 6.000 6.000 6.000 6.000 6.000 6.002 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 571 572 573 574 575 576 577 578 579 580 SiO.sub.2 62.143 60.881 62.128 63.193 60.958 62.199 63.132 64.227 61.061 62.392 Al.sub.2O.sub.3 13.463 14.707 13.562 12.563 14.711 13.567 12.700 11.677 14.715 13.479 B.sub.2O.sub.3 6.000 6.003 6.002 6.000 6.004 6.003 6.002 6.000 6.006 6.004 P.sub.2O.sub.5 Li.sub.2O 9.589 9.005 9.546 10.018 9.006 9.547 9.956 10.440 9.009 9.593 Na.sub.2O 1.853 2.001 1.865 1.746 2.001 1.865 1.762 1.640 2.002 1.855 K.sub.2O 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 MgO 3.174 2.996 2.484 2.210 2.359 1.880 1.567 1.261 1.502 1.061 CaO 2.236 3.008 2.974 2.772 3.646 3.580 3.481 3.300 4.505 4.357 ZnO SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 1.000 0.800 0.894 1.000 0.715 0.814 0.895 1.000 0.601 0.718 CeO.sub.2 0.341 0.400 0.346 0.298 0.400 0.346 0.305 0.256 0.400 0.342 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.341 1.200 1.240 1.298 1.115 1.160 1.200 1.256 1.001 1.059 R.sub.2O 11.642 11.206 11.611 11.963 11.208 11.612 11.919 12.280 11.211 11.648 Li.sub.2O + Na.sub.2O 11.442 11.006 11.411 11.763 11.008 11.412 11.718 12.080 11.011 11.447 R.sub.2O − Al.sub.2O.sub.3 −1.821 −3.502 −1.951 −0.600 −3.502 −1.954 −0.782 0.603 −3.503 −1.832 R′O 5.411 6.003 5.458 4.982 6.004 5.460 5.047 4.560 6.006 5.418 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 581 582 583 584 585 586 587 588 589 590 SiO.sub.2 63.363 64.322 65.600 60.700 60.817 61.571 60.902 61.607 62.195 60.987 Al.sub.2O.sub.3 12.578 11.687 10.500 14.700 13.823 13.139 13.182 12.468 12.019 12.547 B.sub.2O.sub.3 6.003 6.002 6.000 6.000 6.877 6.901 7.518 7.625 7.547 8.153 P.sub.2O.sub.5 Li.sub.2O 10.019 10.439 11.000 9.000 9.000 9.600 9.000 9.552 10.031 9.000 Na.sub.2O 1.747 1.641 1.500 2.000 2.000 1.850 2.000 1.862 1.742 2.000 K.sub.2O 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 MgO 0.740 0.423 0.000 4.500 3.623 4.050 2.982 3.289 3.727 2.347 CaO 4.249 4.142 4.000 1.500 2.377 1.350 3.018 2.159 1.242 3.653 ZnO SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 0.803 0.888 1.000 1.000 0.883 1.000 0.798 0.894 1.000 0.713 CeO.sub.2 0.299 0.256 0.200 0.400 0.400 0.340 0.400 0.345 0.297 0.400 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.102 1.144 1.200 1.400 1.283 1.340 1.198 1.239 1.297 1.113 R.sub.2O 11.966 12.281 12.700 11.200 11.200 11.650 11.200 11.614 11.973 11.200 Li.sub.2O + Na.sub.2O 11.766 12.081 12.500 11.000 11.000 11.450 11.000 11.414 11.773 11.000 R.sub.2O − Al.sub.2O.sub.3 −0.611 0.594 2.200 −3.500 −2.623 −1.489 −1.982 −0.854 −0.046 −1.347 R′O 4.989 4.565 4.000 6.000 6.000 5.400 6.000 5.448 4.969 6.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 591 592 593 594 595 596 597 598 599 600 SiO.sub.2 61.683 62.202 62.803 61.100 61.838 62.374 62.901 63.600 60.661 62.068 Al.sub.2O.sub.3 11.870 11.409 10.929 11.700 11.051 10.579 10.115 9.500 14.715 13.849 B.sub.2O.sub.3 8.226 8.232 8.176 9.000 9.000 9.000 9.000 9.000 6.006 5.113 P.sub.2O.sub.5 Li.sub.2O 9.549 9.963 10.451 9.000 9.590 10.019 10.441 11.000 9.009 9.600 Na.sub.2O 1.863 1.759 1.637 2.000 1.852 1.745 1.640 1.500 2.002 2.001 K.sub.2O 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 MgO 2.686 2.991 3.412 1.500 1.943 2.264 2.581 3.000 4.505 4.503 CaO 2.764 2.046 1.137 4.500 3.467 2.717 1.978 1.000 1.502 1.501 ZnO SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 0.813 0.895 1.000 0.600 0.718 0.804 0.888 1.000 1.001 0.852 CeO.sub.2 0.345 0.304 0.255 0.400 0.341 0.298 0.256 0.200 0.400 0.311 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.158 1.199 1.255 1.000 1.059 1.102 1.144 1.200 1.401 1.163 R.sub.2O 11.612 11.922 12.288 11.200 11.643 11.964 12.281 12.700 11.211 11.802 Li.sub.2O + Na.sub.2O 11.412 11.722 12.088 11.000 11.443 11.764 12.081 12.500 11.011 11.602 R.sub.2O − Al.sub.2O.sub.3 −0.258 0.514 1.359 −0.500 0.592 1.385 2.166 3.200 −3.503 −2.047 R′O 5.451 5.037 4.549 6.000 5.410 4.981 4.559 4.000 6.006 6.004 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 601 602 603 604 605 606 607 608 609 610 SiO.sub.2 62.777 63.086 63.874 64.293 64.083 64.816 65.297 65.769 65.400 66.069 Al.sub.2O.sub.3 13.448 13.223 12.770 12.540 12.610 12.190 11.918 11.656 11.800 11.422 B.sub.2O.sub.3 5.102 4.468 4.369 4.455 3.835 3.767 3.764 3.825 3.000 3.000 P.sub.2O.sub.5 Li.sub.2O 9.908 10.028 10.368 10.553 10.447 10.764 10.973 11.179 11.000 11.291 Na.sub.2O 2.001 2.001 2.001 2.001 2.001 2.001 2.001 2.001 2.000 2.000 K.sub.2O 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 0.200 MgO 4.052 4.502 4.090 3.728 4.501 4.093 3.782 3.413 4.500 4.064 CaO 1.351 1.501 1.363 1.243 1.500 1.364 1.261 1.138 1.500 1.355 ZnO SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 0.850 0.745 0.728 0.742 0.639 0.628 0.627 0.637 0.500 0.500 CeO.sub.2 0.310 0.247 0.237 0.245 0.183 0.177 0.176 0.182 0.100 0.100 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 1.160 0.991 0.965 0.988 0.823 0.805 0.804 0.820 0.600 0.600 R.sub.2O 12.110 12.229 12.569 12.754 12.647 12.965 13.173 13.380 13.200 13.491 Li.sub.2O + Na.sub.2O 11.910 12.029 12.369 12.553 12.447 12.765 12.973 13.180 13.000 13.291 R.sub.2O − Al.sub.2O.sub.3 −1.338 −0.995 −0.201 0.214 0.038 0.774 1.255 1.724 1.400 2.069 R′O 5.403 6.003 5.453 4.971 6.002 5.457 5.043 4.550 6.000 5.418 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.) Example 611 612 613 SiO.sub.2 66.560 67.047 67.700 Al.sub.2O.sub.3 11.144 10.869 10.500 B.sub.2O.sub.3 3.000 3.000 3.000 P.sub.2O.sub.5 Li.sub.2O 11.504 11.716 12.000 Na.sub.2O 2.000 2.000 2.000 K.sub.2O 0.200 0.200 0.200 MgO 3.743 3.426 3.000 CaO 1.248 1.142 1.000 ZnO SnO.sub.2 Fe.sub.2O.sub.3 TiO.sub.2 0.500 0.500 0.500 CeO.sub.2 0.100 0.100 0.100 ZrO.sub.2 La.sub.2O.sub.3 SO.sub.3 WO.sub.3 Nb.sub.2O.sub.5 Bi.sub.2O.sub.3 MoO.sub.3 CeO.sub.2 + TiO.sub.2 0.600 0.600 0.600 R.sub.2O 13.704 13.916 14.200 Li.sub.2O + Na.sub.2O 13.504 13.716 14.000 R.sub.2O − Al.sub.2O.sub.3 2.560 3.047 3.700 R′O 4.991 4.567 4.000 Thickness (mm) L* a* b* Density (g/cm.sup.3) Liquidus Temp. (° C.)
[0087] The change in b* value experienced as a result of the annealing process for Examples 422-448 was calculated, and is reported in Table II below.
TABLE-US-00002 TABLE II Example Delta b* 422 0.28 423 0.20 424 0.30 425 0.39 426 0.62 427 0.11 428 0.92 429 0.45 430 1.22 431 1.26 432 1.41 433 4.01 434 2.00 435 6.06 436 15.85 437 0.42 438 0.19 439 0.56 440 58.97 441 −0.07 442 0.05 443 0.22 444 20.43 445 0.46 446 1.39 447 −0.07 448 4.78
[0088] To investigate the impact of Fe.sub.2O.sub.3 content in the glass composition on the color and color stability of the colored glass articles, the b* value was plotted for a number of glass compositions with different Fe.sub.2O.sub.3 contents, as shown in
[0089] The effect of SnO.sub.2 content on b* was investigated by plotting the a* and b* values for glass compositions with various analyzed SnO.sub.2 contents, as shown in
[0090] To investigate the impact of CeO.sub.2 on the stability of titanium oxidation states in the colored glass articles, and the associated color stability of the colored glass articles, XPS analysis was performed. Glass bars with a size of 3 mm×3 mm×10 mm were formed from the glass composition of Example 307 that includes CeO.sub.2 and TiO.sub.2, and a comparative composition that contains TiO.sub.2 in the absence of CeO.sub.2 was formed into bars of the same dimensions. The comparative composition as analyzed included 61.5 mol % SiO.sub.2, 14.5 mol % Al.sub.2O.sub.3, 5.7 mol % B.sub.2O.sub.3, 9.8 mol % Li.sub.2O, 1.8 mol % Na.sub.2O, 0.2 mol % K.sub.2O, 2.0 mol % MgO, 2.0 mol % CaO, 1.0 mol % ZnO, 1.5 mol % TiO.sub.2, and 0.004 mol % Fe.sub.2O.sub.3. The Example 307 glass bars were fractured under ultra-high vacuum in as formed condition, after annealing at 600° C. for 24 hours, and after annealing at 600° C. for 48 hours. The oxidation state of titanium and cerium was determined by XPS analysis at the fracture site, with the predominant oxidation state for titanium being Ti.sup.4+ and for cerium being Ce.sup.3+. The results indicated that the content of Ti.sup.3+ increased with increasing annealing time as shown in
[0091] It will be apparent to those skilled in the art that various modifications and variations may be made to the embodiments described herein without departing from the spirit and scope of the claimed subject matter. Thus, it is intended that the specification cover the modifications and variations of the various embodiments described herein provided such modification and variations come within the scope of the appended claims and their equivalents.