Provided are crystallized glass that is easy to process and in which a high compressive stress value can be obtained on a surface, and reinforced crystallized glass thereof. A crystallized glass containing at least one type selected from α-cristobalite and an α-cristobalite solid solution as a main crystal phase, in which, by mass % in terms of oxide, a content of a SiO.sub.2 component is 50.0% to 75.0%, a content of a Li.sub.2O component is 3.0% to 10.0%, a content of an Al.sub.2O.sub.3 component is 5.0% or more and less than 15.0%, and a content of a B.sub.2O.sub.3 component is more than 0% and 10.0% 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.

Embodiments of a glass-ceramic, glass-ceramic article or glass-ceramic window that includes 40 mol %≤SiO.sub.2≤80 mol %; 1 mol %≤AI.sub.2O.sub.3≤15 mol %; 3 mol %≤B.sub.2O.sub.3≤50 mol %; 0 mol %≤R.sub.2O≤15 mol %; 0 mol %≤RO≤2 mol %; 0 mol %≤P.sub.2O.sub.5≤3 mol %; 0 mol %≤SnO.sub.2≤0.5 mol %; 0.1 mol %≤MoO.sub.3≤15 mol %; and 0 mol %≤WO.sub.3≤10 mol % (or 0 mol %<MoO.sub.3≤15 mol %; 0.1 mol %≤WO.sub.3≤10 mol %; and 0.01 mol %≤V.sub.2O.sub.5≤0.2 mol %), wherein the WO.sub.3 (mol %) plus the MoO.sub.3 (mol %) is from 1 mol % to 19 mol %, and wherein R.sub.2O (mol %) minus the AI.sub.2O.sub.3 (mol %) is from −12 mol % to 4 mol %, are disclosed.

Embodiments of the present invention pertain to glass compositions, glasses and articles. The articles include an aluminosilicate glass, which may include P.sub.2O.sub.5 and K.sub.2O.

Articles include a glass, including leachable plurality of Cu.sup.1+ ions, a degradable phase, and a cuprite phase disposed within the degradable phase. The cuprite phase is disposed within the degradable phase. In aspects, the degradable phase can include B.sub.2O.sub.3, P.sub.2O.sub.5, and K.sub.2O, and a durable phase can include SiO.sub.2. In aspects, the glass can have a plurality of Cu.sup.1+ ions disposed on the surface of the glass and in the glass network and/or the glass matrix. The article may also include a polymer. The glasses and articles disclosed herein exhibit a 2 log reduction or greater in a concentration of at least one of Staphylococcus aureus, Enterobacter aerogenes, Pseudomonas aeruginosa bacteria, Methicillin Resistant Staphylococcus aureus, and E. coli, under the EPA Test Method for Efficacy of Copper Alloy as a Sanitizer testing condition and under Modified JIS Z 2801 for Bacteria testing conditions.

The present invention discloses a microcrystalline glass, a microcrystalline glass product, and a manufacturing method therefor. The main crystal phase of the microcrystalline glass comprises lithium silicate and a quartz crystal phase. The haze of the microcrystalline glass of the thickness of 0.55 mm is below 0.6%. The microcrystalline glass comprises the following components in percentage by weight: SiO.sub.2: 65-85%; Al.sub.2O.sub.3: 1-15%; Li.sub.2O: 5-15%; ZrO.sub.2: 0.1-10%; P.sub.2O.sub.5: 0.1-10%; K.sub.2O: 0-10%; MgO: 0-10%; ZnO: 0-10%. A four-point bending strength of the microcrystalline glass product is more than 600 Mpa.

The present invention is a glass ceramic including a crystal and a residual glass, in which the residual glass has a Young's modulus parameter ER of 75 or more, the Young's modulus parameter ER being calculated based on the following formula: ER=62.2×[SiO.sub.2]+134.9×[Al.sub.2O.sub.3]+121.7×[B.sub.2O.sub.3]+33.0×[P.sub.2O.sub.5]+72.6×[MgO]+121.5×[CaO]+43.7×[SrO]+38.6×[BaO]+84.0×[Li.sub.2O]+26.2×[Na.sub.2O]+17.8×[K.sub.2O]+156.8×[ZrO.sub.2]+154.3×[TiO.sub.2]+74.7×[La.sub.2O.sub.3]+80.3×[Y.sub.2O.sub.3]+54.3×[ZnO].

Embodiments of a transparent glass-based material comprising a glass phase and a second phase that is different from and is dispersed in the glass phase are provided. The second phase may comprise a crystalline or a nanocrystalline phase, a fiber, and/or glass particles. In some embodiments, the second phase is crystalline. In one or more embodiments, the glass-based material has a transmittance of at least about 88% over a visible spectrum ranging from about 400 nm to about 700 nm and a fracture toughness of at least about 0.9 MPa.Math.m.sup.½, and wherein a surface of the glass-based material, when scratched with a Knoop diamond at a load of at least 5 N to form a scratch having a width w, is free of chips having a size of greater than 3w.

A cover glass made of a glass ceramic that is silica based and has a main crystal phase of high quartz solid solution or keatite solid solution is provided. The cover glass has a stress profile with at least one inflection point at a depth of the cover glass of more than 10 μm, a thickness from 0.1 mm to 2 mm, and a chemical tempering structure with a surface compressive stress of at least 250 MPa and at most 1500 MPa. A process for producing the cover glass is provided that includes producing a silica based green glass, hot shaping the silica based green glass, thermally treating the silica based green glass with a nucleation step and a ceramization step, and performing an ion exchange at an exchange bath temperature for a duration of time in an exchange bath.

An electrical device includes: a housing part made of a metal and including a feedthrough therethrough, an opening of the feedthrough, a first region, and a second region, the opening receiving a conductive material or a conductor in a glass material or a glass-ceramic material, wherein: (i) the conductive material has a first coefficient of expansion α.sub.1, the glass material or the glass-ceramic material has a second coefficient of expansion α.sub.2, and the housing part has a third coefficient of expansion α.sub.3, the third coefficient of expansion α.sub.3 being always greater than the second coefficient of expansion α.sub.2; or (ii) the first region including a width W that is substantially perpendicular to the axis of the at least one opening, the width W of the first region being always greater than a thickness D.sub.2 and a thickness D.sub.E of the second region; or (iii) a combination of (i) and (ii).