An ultraviolet light absorbing glass according to the present invention includes 1.6% or more of t-Fe.sub.2O.sub.3, more than 1.0% of TiO.sub.2, and 0.016% or more of CoO. The ultraviolet light absorbing glass has t-Fe.sub.2O.sub.3/TiO.sub.2 of 1.2 or more, and an ultraviolet light transmittance (TUV400) at a sheet thickness of 3.1 mm of 2.0% or less, a ratio of visible light transmittance (TVA)/TUV400 of 10 or more, and a dominant wavelength (λD) of 555 nm or less.

A glass-ceramic includes glass and crystalline phases, where the crystalline phase includes non-stoichiometric suboxides of titanium, forming ‘bronze’-type solid state defect structures in which vacancies are occupied with dopant cations.

The invention provides an optical glass having excellent precision molding performance and having a refractive index of 1.46-1.53 and an Abbe number of 77-84. The optical glass comprises the following components based on cations in the molar percentage: P.sup.5+: 10-35%, Al.sup.3+: 10-35%, Ba.sup.2+: 1-20%, Sr.sup.2+: 10-35%, Ca.sup.2+: 1-20%, Gd.sup.3+: 0-10%, and Na.sup.+: 0-10%; the ratio of Sr.sup.2+/(Gd.sup.3++Na.sup.+) being 1-30; anions comprising F.sup.− and O.sup.2−, wherein the ratio F.sup.−/P.sup.5+ of F.sup.− content relative to the total molar percentage of anions to P.sup.5+ content relative to the total molar percentage of cations is 2.5 or more. The invention by rationally adjusting the proportions of the components, the molding performance of the optical glass is improved, and the problem that glass is broken and forms fogs during the molding process is solved, thereby the yield in manufacturing optical elements is improved.

Optically transparent glass ceramic materials comprising a glass phase containing and a crystalline tungsten bronze phase comprising nanoparticles and having the formula M.sub.xWO.sub.3, where M includes at least one H, Li, Na, K, Rb, Cs, Ca, Sr, Ba, Zn, Cu, Ag, Sn, Cd, In, Tl, Pb, Bi, Th, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, and U, and where 0<x<1. Aluminosilicate and zinc-bismuth-borate glasses comprising at least one of Sm.sub.2O.sub.3, Pr.sub.2O.sub.3, and Er.sub.2O.sub.3 are also provided.

Multicolored glass-based articles and methods of manufacture are disclosed. The method includes forming a glass-based part and exposing a first region to radiation and a second region to radiation such that the first and second regions have different sized metallic nanoparticles, resulting in a multicolored glass article.

The present invention relates to an ultraviolet-shielding glass sheet including a glass composition based on soda-lime glass, the glass composition containing iron oxide and TiO.sub.2 as coloring components. The glass sheet has a thickness of 1 to 5 mm, and an ultraviolet transmittance (Tuv 380) as determined at the thickness according to ISO 9050:1990 is 1.5% or less.

The present invention provides a glass substrate in which in a heat treatment step of sticking a silicon substrate and a glass substrate to each other, an alkali ion is hardly diffused into the silicon substrate, and a residual strain generated in the silicon substrate is small. A glass substrate of the present invention has: an average thermal expansion coefficient α.sub.50/100 at 50° C. to 100° C. of 2.70 ppm/° C. to 3.20 ppm/° C.; an average thermal expansion coefficient α.sub.200/300 at 200° C. to 300° C. of 3.45 ppm/° C. to 3.95 ppm/° C.; a value α.sub.200/300/α.sub.50/100 obtained by dividing the average thermal expansion coefficient α.sub.200/300 at 200° C. to 300° C. by the average thermal expansion coefficient α.sub.50/100 at 50° C. to 100° C. of 1.20 to 1.30; and a content of an alkali metal oxide being 0% to 0.1% as expressed in terms of a molar percentage based on oxides.

A glass-ceramic, includes a silicate-containing glass comprising a first portion and a second portion. A plurality of crystalline precipitates comprising at least one of W and Mo. The crystalline precipitates are distributed within at least one of the first and second portions of the silicate-containing glass. The glass-ceramic comprises a difference in absorbance between the first and second portions of 0.04 optical density (OD)/mm or greater over a wavelength range of from 400 nm to 1500 nm.

Provided is a Li.sub.2O—Al.sub.2O.sub.3—SiO.sub.2-based crystallized glass in which a yellowish tint due to TiO.sub.2, Fe.sub.2O.sub.3 or so on is reduced. The Li.sub.2O—Al.sub.2O.sub.3—SiO.sub.2-based crystallized glass contains, in terms of % by mass, 40 to 90% SiO.sub.2, 5 to 30% Al.sub.2O.sub.3, 1 to 10% Li.sub.2O, 0 to 20% SnO.sub.2, 1 to 20% ZrO.sub.2, 0 to 10% MgO, 0 to 10% P.sub.2O.sub.5, and 0 to below 2% TiO.sub.2.

Glass compositions include phosphorus oxide (P.sub.2O.sub.5), niobia (Nb.sub.2O.sub.5), titania (TiO.sub.2), potassium oxide (K.sub.2O) and calcium oxide (CaO) as essential components and may optionally include barium oxide (BaO), sodium oxide (Na.sub.2O), lithium oxide (Li.sub.2O), tungsten oxide (WO.sub.3), bismuth oxide (Bi.sub.2O.sub.3), tantalum oxide (Ta.sub.2O.sub.5), silica (SiO.sub.2) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.