Abstract: A glass-ceramic article includes a crystalline phase, a residual glass phase, greater than or equal to 55 mol % and less than or equal to 80 mol % SiO2, greater than or equal to 1 mol % and less than or equal to 8 mol % Al2O3, greater than or equal to 13 mol % and less than or equal to 35 mol % Li2O, greater than or equal to 0.05 mol % and less than or equal to 5 mol % Na2O, greater than or equal to 0.05 mol % and less than or equal to 3 mol % K2O, greater than or equal to 0.2 mol % and less than or equal to 2 mol % P2O5, and greater than or equal to 1.5 mol % and less than or equal to 10 mol % ZrO2, wherein the crystalline phase comprises a lithium disilicate sub-phase.

Abstract: A glass-ceramic article comprises: a center-volume composition comprising (on an oxide basis): 55-75 mol % SiO2; 0.2-10 mol % Al2O3; 0-5 mol % B2O3; 15-30 mol % Li2O; 0-2 mol % Na2O; 0-2 mol % K2O; 0-5 mol % MgO; 0-2 mol % ZnO; 0.2-3.0 mol % P2O5; 0.1-10 mol % ZrO2; 0-4 mol % TiO2; and 0-1.0 mol % SnO2. Lithium disilicate and either ?-spodumene or ?-quartz are the two predominant crystalline phases (by weight) of the glass-ceramic article. The glass-ceramic article further comprises tetragonal ZrO2 as a crystalline phase. The composition of the glass-ceramic article from a primary surface into a thickness of the glass-ceramic article can comprise over 10 mol % Na2O (on an oxide basis), with the mole percentage of Na2O decreasing from the primary surface towards the center-volume. The glass-ceramic article exhibits a ring-on-ring load-to-failure of at least 120 kgf, when the thickness of the glass-ceramic article is 0.3 mm to 2.0 mm.

Abstract: A glass-ceramic article comprises: a center-volume composition comprising (on an oxide basis): 55-75 mol % SiO2; 0.2-10 mol % Al2O3; 0-5 mol % B2O3; 15-30 mol % Li2O; 0-2 mol % Na2O; 0-2 mol % K2O; 0-5 mol % MgO; 0-2 mol % ZnO; 0.2-3.0 mol % P2O5; 0.1-10 mol % ZrO2; 0-4 mol % TiO2; and 0-1.0 mol % SnO2. Lithium disilicate and either ?-spodumene or ?-quartz are the two predominant crystalline phases (by weight) of the glass-ceramic article. The glass-ceramic article further comprises tetragonal ZrO2 as a crystalline phase. The composition of the glass-ceramic article from a primary surface into a thickness of the glass-ceramic article can comprise over 10 mol % Na2O (on an oxide basis), with the mole percentage of Na2O decreasing from the primary surface towards the center-volume. The glass-ceramic article exhibits a ring-on-ring load-to-failure of at least 120 kgf, when the thickness of the glass-ceramic article is 0.3 mm to 2.0 mm.

Abstract: A silicate-based composition includes: 40-80 mol % SiO2, >0-25 mol % MO, 15-40 mol % R2O, >0-10 mol % Al2O3, >0-10 mol % P2O5, and >0-5 mol % ZrO2, such that MO is a sum of BeO, MgO, CaO, SrO, and BaO; and R2O is a sum of Li2O, Na2O, K2O, Rb2O, Cs2O.

Abstract: A transparent ?-spodumene glass-ceramic is provided. The glass-ceramic includes a primary crystal phase including a ?-spodumene solid solution, a secondary crystal phase including tetragonal ZrO2, and an amorphous phase. The glass-ceramic may be ion exchanged utilizing molten alkali nitrate salt baths. Methods for producing the glass-ceramic are also provided.

Abstract: An optical diffuser can comprise an amorphous phase and a crystalline phase comprising lithium disilicate and one or more of ß-spodumene or ß-quartz comprising a median grain size ranging from about 500 nanometers to about 1,000 nanometers. The crystalline phase can be dispersed throughout a volume of the optical diffuser. The optical diffuser can comprise, on an oxide basis in mol %, SiO2: 60-75; Al2O3: 2-9; Li2O: 17-25; and Na2O+K2O: 0.5-6. Methods of making an optical diffuser can comprise forming a mixture by melting together, on an oxide basis in mol %, SiO2: 60-75; Al2O3: 2-9; Li2O: 17-25; and Na2O+K2O: 0.5-6. Methods can comprise forming a ribbon from the mixture. Methods can comprise heating the ribbon about 850° C. to about 900° C. for about 0.5 hours to about 6 hours.

Abstract: A glass composition includes: greater than or equal to 56 mol % to less than or equal to 70 mol % SiO2; greater than or equal to 12 mol % to less than or equal to 20 mol % Al2O3; greater than or equal to 0 mol % to less than or equal to 4 mol % P2O5; greater than or equal to 0 mol % to less than or equal to 8 mol % B2O3; greater than or equal to 6 mol % to less than or equal to 12 mol % Li2O; greater than or equal to 4 mol % to less than or equal to 12 mol % Na2O; greater than or equal to 0.4 mol % to less than or equal to 3 mol % K2O; greater than or equal to 2 mol % to less than or equal to 6 mol % MgO; greater than or equal to 0.25 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 % SrO; greater than or equal to 0 mol % to less than or equal to 5 mol % ZnO; and greater than or equal to 0 mol % to less than or equal to 1 mol % ZrO2. The glass composition may have a fracture toughness of greater than or equal 0.75 MPa·m0.

Abstract: In embodiments, a glass includes from 45 mol % to 70 mol % SiO2; from 11.5 mol % to 25 mol % Al2O3; from 2 mol % to 20 mol % Li2O; from greater than 0 mol % to 10 mol % Na2O; from 9 mol % to 19 mol % MgO; from 4 mol % ZrO2; and from 0 mol % to 0.5 mol % TiO2. In other embodiments, a glass includes from 45 mol % to 70 mol % SiO2; from 4 mol % to 25 mol % Al2O3; from 5 mol % to 20 mol % Li2O; from 0.1 mol % to 10 mol % Na2O; from 6 mol % to 25 mol % MgO; from 0.1 mol % to 4 mol % ZrO2; from 0.1 mol % to 5 mol % K2O; and from 0.05 mol % to 0.5 mol % SnO2.

Abstract: A glass-ceramic article includes from 60 mol % to 72 mol % SiO2; from 2.5 mol % to 8 mol % Al2O3; from 17 mol % to 26 mol % Li2O; from 0.2 mol % to 4 mol % ZrO2; and from 0.5 mol % to 2 mol % P2O5. The sum of alkaline earth oxides and transitional metal oxides in the glass-ceramic article may be from 0.1 mol % to 6 mol %, wherein alkaline earth oxides is the sum of CaO, MgO, SrO, and BaO and transition metal oxides is the sum of La2O3, Y2O3, Ta2O5, and GeO2. The sum of P2O5 and ZrO2 in the glass-ceramic article may be from 1 mol % to 6 mol %. The glass-ceramic article may comprise a crystalline phase comprising lithium disilicate and petalite. The total amount of lithium disilicate and petalite in the crystalline phase of the glass-ceramic article may be greater than 50 wt %, based on a total weight of the crystalline phase.

Abstract: A glass-ceramic article includes a crystalline phase; a residual glass phase; greater than or equal to 52 mol % and less than or equal to 70 mol % SiO2, greater than or equal to 14 mol % and less than or equal to 35 mol % Li2O, greater than or equal to 0.1 mol % and less than or equal to 15 mol % CaO, greater than or equal to 0.5 mol % and less than or equal to 10 mol % ZrO2; and greater than or equal to 0.5 mol % and less than or equal to 5 mol % P2O5.

Abstract: A silicate-based glass composition includes: 40-60 wt. % SiO2, 0-10 wt. % B2O3, 0.01-10 wt. % P2O5, 0-10 wt. % Al2O3, 0-5 wt. % Li2O, 10-30 wt. % Na2O, 0.01-15 wt. % K2O, 0.01-5 wt. % MgO, 15-30 wt. % CaO, 15-35 wt. % MO, and 15-30 wt. % R2O, such that MO is the sum of MgO, CaO, SrO, BeO, and BaO, and R2O is the sum of Na2O, K2O, Li2O, Rb2O, and Cs2O.

Abstract: A black ?-spodumene glass ceramic is provided. The glass ceramic includes ?-spodumene as a primary crystal phase and gahnite as a minor crystal phase. The glass ceramic is characterized by the color coordinates: L*: 20.0 to 40.0, a*: ?1.0 to 0.5, and b*: ?5.0 to 1.0. The glass ceramic may be ion exchanged. Methods for producing the glass ceramic are also provided.

Abstract: A black ?-spodumene lithium disilicate glass ceramic is provided. The glass ceramic includes at least one of magnetite, ?-quartz, cristobalite, and lithium phosphate as a minor crystal phase. The glass ceramic is characterized by the color coordinates: L*: 15.0 to 35.0, a*: ?3.0 to 3.0, and b*: ?5.0 to 5.0. The glass ceramic may be ion exchanged. Methods for producing the glass ceramic are also provided.

Abstract: A black ?-spodumene glass ceramic is provided. The glass ceramic includes ?-spodumene as a primary crystal phase and gahnite as a minor crystal phase. The glass ceramic is characterized by the color coordinates: L*: 20.0 to 40.0, a*: ?1.0 to 0.5, and b*: ?5.0 to 1.0. The glass ceramic may be ion exchanged. Methods for producing the glass ceramic are also provided.

Abstract: A method of regenerating a poisoned molten salt bath is provided. The method includes contacting glass particulates with the molten salt bath such that poisoning ions are exchanged from the bath into the glass. The glass compositions utilized in the method are also provided.

Abstract: A glass-ceramic article comprises: a center-volume composition comprising (on an oxide basis): 55-75 mol % SiO2; 0.2-10 mol % Al2O3; 0-5 mol % B2O3; 15-30 mol % Li2O; 0-2 mol % Na2O; 0-2 mol % K2O; 0-5 mol % MgO; 0-2 mol % ZnO; 0.2-3.0 mol % P2O5; 0.1-10 mol % ZrO2; 0-4 mol % TiO2; and 0-1.0 mol % SnO2. Lithium disilicate and either ?-spodumene or ?-quartz are the two predominant crystalline phases (by weight) of the glass-ceramic article. The glass-ceramic article further comprises tetragonal ZrO2 as a crystalline phase. The composition of the glass-ceramic article from a primary surface into a thickness of the glass-ceramic article can comprise over 10 mol % Na2O (on an oxide basis), with the mole percentage of Na2O decreasing from the primary surface towards the center-volume. The glass-ceramic article exhibits a ring-on-ring load-to-failure of at least 120 kgf, when the thickness of the glass-ceramic article is 0.3 mm to 2.0 mm.

Abstract: A black ?-spodumene lithium disilicate glass ceramic is provided. The glass ceramic includes at least one of magnetite, ?-quartz, cristobalite, and lithium phosphate as a minor crystal phase. The glass ceramic is characterized by the color coordinates: L*: 15.0 to 35.0, a*: ?3.0 to 3.0, and b*: ?5.0 to 5.0. The glass ceramic may be ion exchanged. Methods for producing the glass ceramic are also provided.

Abstract: A glass-ceramic article having one or more crystalline phases; a residual glass phase; a compressive stress layer extending from a first surface to a depth of compression (DOC); a maximum central tension greater than 70 MPa; a stored tensile energy greater than 22 J/m2; a fracture toughness greater than 1.0 MPa?m; and a haze less than 0.2.

Abstract: Disclosed herein are glass-ceramic article having a first surface, a second surface opposing the first surface, a first region extending from the first surface to a first depth d1, and a second region extending from a depth greater than or equal to d1 to a second depth d2, wherein the second region comprises a crystalline phase and a glass phase, and wherein an area percentage % of crystals in the first region is less than an area percentage % of crystals in the second region. In some embodiments, a compressive stress layer extends from the first surface to a depth of compression (DOC), wherein the DOC is greater than or equal to 0.05 mm an average compressive stress in the first region is greater than or equal to 50 MPa. In some embodiments, the DOC is greater than d1; a reduce modulus of the first region is less than the reduced modulus of the second region; and/or a hardness of the first region is less than the hardness of the second region.

Abstract: A black ?-spodumene glass ceramic is provided. The glass ceramic includes ?-spodumene as a primary crystal phase and gahnite as a minor crystal phase. The glass ceramic is characterized by the color coordinates: L*: 20.0 to 40.0, a*: ?1.0 to 0.5, and b*: ?5.0 to 1.0. The glass ceramic may be ion exchanged. Methods for producing the glass ceramic are also provided.