Abstract: Ion exchangeable alkali aluminosilicate glasses and glass articles having softening points and high temperature coefficients of thermal expansion that permit the glass to be formed into three-dimensional shapes by the vacuum sagging process are provided. These glasses contain significant amounts of at least one of MgO and ZnO and comprise B2O3 and less than 1 mol % Li2O.

Abstract: Aluminosilicate glasses whose composition is free of alkali metals and contain, as a weight percentage of oxides, 60 to 70% SiO2, 13 to 22% Al2O3, 0 to 9% B2O3, 1 to 6% MgO, 0 to 5% CaO, 1 to 5% BaO, 2 to 12% ZnO, and 0 to 3% SrO, wherein Al2O3+B2O3+ZnO>23% and B2O3+MgO—CaO—BaO—SrO<6%. The glasses exhibit a low coefficient of thermal expansion (CTE) and strong acid and alkali durabilities, and may be used in substrates for induction cooktops.

Abstract: According to one embodiment, a glass article may include SiO2, Al2O3, Li2O and Na2O. The glass article may have a softening point less than or equal to about 810° C. The glass article may also have a high temperature CTE less than or equal to about 27×10?6/° C. The glass article may also be ion exchangeable such that the glass has a compressive stress greater than or equal to about 600 MPa and a depth of layer greater than or equal to about 25 ?m after ion exchange in a salt bath comprising KNO3 at a temperature in a range from about 390° C. to about 450° C. for less than or equal to approximately 15 hours.

Abstract: According to one embodiment, a glass article may include SiO2, Al2O3, Li2O and Na2O. The glass article may have a softening point less than or equal to about 810° C. The glass article may also have a high temperature CTE less than or equal to about 27×10?6/° C. The glass article may also be ion exchangeable such that the glass has a compressive stress greater than or equal to about 600 MPa and a depth of layer greater than or equal to about 25 ?m after ion exchange in a salt bath comprising KNO3 at a temperature in a range from about 390° C. to about 450° C. for less than or equal to approximately 15 hours.

Abstract: Crystallizable glasses, glass-ceramics, IXable glass-ceramics, and IX glass-ceramics are disclosed. The glass-ceramics exhibit ?-spodumene ss as the predominant crystalline phase. These glasses and glass-ceramics, in mole %, include: 62-75 SiO2; 10.5-17 Al2O3; 5-13 Li2O; 0-4 ZnO; 0-8 MgO; 2-5 TiO2; 0-4 B2O3; 0-5 Na2O; 0-4 K2O; 0-2 ZrO2; 0-7 P2O5; 0-0.3 Fe2O3; 0-2 MnOx; and 0.05-0.2 SnO2. Additionally, these glasses and glass-ceramics exhibit the following criteria: a. a ratio: [ Li 2 ? O + Na 2 ? O + K 2 ? O + MgO + ZnO ] [ Al 2 ? O 3 + B 2 ? O 3 ] ?between 0.7 to 1.5; b. a ? ? ratio ? : ? [ TiO 2 + SnO 2 ] [ SiO 2 + B 2 ? O 3 ] ?greater than 0.04. Furthermore, the glass-ceramics exhibit an opacity ?about 85% over the wavelength range of 400-700 nm for an about 0.

Abstract: Beta-quartz glass-ceramics containing in their composition neither arsenic oxide nor antimony oxide and having a controlled transmission curve, articles made using the glass-ceramics, including cooktops, and precursor glasses of such glass-ceramics.

Abstract: Transparent, essentially colorless and non-diffusing ?-quartz glass-ceramics and glass compositions for forming the same have a composition, free of arsenic oxide, antimony oxide and rare earth oxides except for inevitable trace amounts, which contains, expressed as percentages by weight of oxides 62-72% of SiO2, 20-23% of Al2O3, 2.8-5% of Li2O, 0.1-0.6% of SnO2, 1.9-4% of TiO2, 1.6-3% of ZrO2, less than 0.4% of MgO, 2.5-6% of ZnO and/or BaO and/or SrO, less than 250 ppm of Fe2O3; and their crystallites present in the ?-quartz solid solution have an average size of less than 35 nm. The glass-ceramics exhibit low thermal expansion and are easily obtained at an industrial scale.

Abstract: ?-quartz lithium aluminosilicate (LAS) glass-ceramics contain neither arsenic oxide nor antimony oxide, are fined with tin oxide and include vanadium oxide, chromium oxide and a high iron oxide content (>1500 ppm), and have a controlled transmission curve. Articles such as cook-tops can be made from such glass-ceramics.

Abstract: ?-quartz lithium aluminosilicate (LAS) glass-ceramics contain neither arsenic oxide nor antimony oxide, are fined with tin oxide and include vanadium oxide, chromium oxide and a high iron oxide content (>950 ppm), and have a controlled transmission curve. Articles such as cook-tops can be made from such glass-ceramics.

Abstract: Glass-ceramics exhibiting a Vickers indentation crack initiation threshold of at least 15 kgf are disclosed. These glass-ceramics may be ion exchangeable or ion exchanged. The glass-ceramics include a crystalline and amorphous phases generated by subjecting a thin precursor glass article to ceramming cycle having an average cooling rate in the range from about 10° C./minute to about 25° C./minute. In one or more embodiments, the crystalline phase may comprise at least 20 wt % of the glass-ceramics. The glass-ceramics may include ?-spodumene ss as the predominant crystalline phase and may exhibit an opacity ?about 85% over the wavelength range of 400-700 nm for an about 0.8 mm thickness and colors an observer angle of 10° and a CIE illuminant F02 determined with specular reflectance included of a* between ?3 and +3, b* between ?6 and +6, and L* between 88 and 97.

Abstract: A transparent glass-ceramic materials contains a spinel solid solution as the main crystalline phase and is free of As2O3 and Sb2O3. Corresponding precursor alumino-silicate glasses, articles made of said transparent glass-ceramic materials as well as a method for manufacturing such articles, and structures comprising a sheet made of such glass-ceramic materials and electronic or optoelectronic devices comprising such structures are also disclosed. Some materials disclosed can be used as substrates for high temperature growth of high quality monocrystalline or polycrystalline silicon thin films. Structures including such substrates with such thin films thereon can be used in photovoltaic devices, flat panel devices and liquid crystal devices.

Abstract: Methods, compositions, and articles provide for LAS-type glass-ceramics having specific thermo-mechanical, optical and coloration characteristics to yield generally brown-grey products. The glass-ceramic materials may include as colorants iron oxide, vanadium oxide, chromium oxide, cobalt oxide, nickel oxide and/or cerium oxide.

Abstract: Transparent, essentially colorless ?-quartz glass-ceramic materials, the composition of which is free of As2O3 and of Sb2O3, where said composition contains a specific combination of three nucleating agents: TiO2, ZrO2 and SnO2; TiO2 being present in low quantity.

Abstract: ?-quartz glass-ceramics, the composition of which is most particularly optimized, with reference to the refining of their precursor glasses, with reference to good resistance to devitrification of said precursor glasses and with reference to their resistance to temperature ageing, articles comprising such glass-ceramics, lithium alumino-silicate glasses, which are precursors of such glass-ceramics, as well as methods for preparing such glass-ceramics and articles.

Abstract: ?-quartz lithium aluminosilicate (LAS) glass-ceramics contain neither arsenic oxide nor antimony oxide, are fined with tin oxide and include vanadium oxide, chromium oxide and a high iron oxide content (>950 ppm), and have a controlled transmission curve. Articles such as cook-tops can be made from such glass-ceramics.

Abstract: ?-quartz lithium aluminosilicate (LAS) glass-ceramics contain neither arsenic oxide nor antimony oxide, are fined with tin oxide and include vanadium oxide, chromium oxide and a high iron oxide content (>1500 ppm), and have a controlled transmission curve. Articles such as cook-tops can be made from such glass-ceramics.

Abstract: Transparent, essentially colorless and non-diffusing ?-quartz glass-ceramics and glass compositions for forming the same have a composition, free of arsenic oxide, antimony oxide and rare earth oxides except for inevitable trace amounts, which contains, expressed as percentages by weight of oxides 62-72% of SiO2, 20-23% of Al2O3, 2.8-5% of Li2O, 0.1-0.6% of SnO2, 1.9-4% of TiO2, 1.6-3% of ZrO2, less than 0.4% of MgO, 2.5-6% of ZnO and/or BaO and/or SrO, less than 250 ppm of Fe2O3; and their crystallites present in the ?-quartz solid solution have an average size of less than 35 nm. The glass-ceramics exhibit low thermal expansion and are easily obtained at an industrial scale.

Abstract: Mineral materials selected from lithium aluminosilicate glasses containing vanadium, precursors of glass-ceramics, and glass-ceramics colored by vanadium contain solid solution(s) of ?-quartz and/or ?-spodumene as main crystalline phase. Also disclosed are articles made from said mineral materials, as well as methods for forming said glasses, glass-ceramics and articles of said glasses and glass-ceramics. Methods involve optimizing the refining of lithium aluminosilicate glasses containing SnO2 as a fining agent in preparing glasses or glass-ceramics.

Abstract: Crystallizable glasses, glass-ceramics, IXable glass-ceramics, and IX glass-ceramics are disclosed. The glass-ceramics exhibit ?-spodumene ss as the predominant crystalline phase. These glasses and glass-ceramics, in mole %, include: 62-75 Si O2; 10.5-17 Al2O3; 5-13 Li2O; 0-4 ZnO; 0-8 MgO; 2-5 TiO2; 0-4 B2O3; 0-5 Na2O; 0-4 K2O; 0-2 ZrO2; 0-7 P2O5; 0-0.3 Fe2O3; 0-2 MnOx; and 0.05-0.2 SnO2. Additionally, these glasses and glass-ceramics exhibit the following criteria: a. a ratio: [ Li 2 ? O + Na 2 ? O + K 2 ? O + MgO + ZnO ] [ Al 2 ? O 3 + B 2 ? O 3 ] between 0.7 to 1.5; b. a ratio: [ TiO 2 + SnO 2 ] [ SiO 2 + B 2 ? O 3 ] greater than 0.04. Furthermore, the glass-ceramics exhibit an opacity ?about 85% over the wavelength range of 400-700 nm for an about 0.

Abstract: Crystallizable glasses, glass-ceramics, IXable glass-ceramics, and IX glass-ceramics are disclosed. The glass-ceramics exhibit ?-spodumene ss as the predominant crystalline phase. These glasses and glass-ceramics, in mole %, include: 62-75 SiO2; 10.5-17 Al2O3; 5-13 Li3O; 0-4 ZnO; 0-8 MgO; 2-5 TiO2; 0-4 B2O3; 0-5 Na2O; 0-4 K2O; 0-2 ZrO2; 0-7 P2O5; 0-0.3 Fe2O3; 0-2 MnOx; and 0.05-0.2 SnO2. Additionally, these glasses and glass-ceramics exhibit the following criteria: a. a ratio: [ Li 2 ? O + Na 2 ? O + K 2 ? O + MgO + ZnO _ ] ? [ Al 2 ? O 3 + B 2 ? O 3 ] between 0.7 to 1.5; b. a ratio: [ TiO 2 + SnO 2 _ ] ? [ SiO 2 + B 2 ? O 3 ] greater than 0.04. Furthermore, the glass-ceramics exhibit an opacity ?about 85% over the wavelength range of 400-700 nm for an about 0.