In embodiments, a precursor glass composition comprises from about 55 wt. % to about 80 wt. % SiO.sub.2; from about 2 wt. % to about 20 wt. % Al.sub.2O.sub.3; from about 5 wt. % to about 20 wt. % Li.sub.2O; greater than 0 wt % to about 3 wt. % Na.sub.2O; a non-zero amount of P.sub.2O.sub.5 less than or equal to 4 wt. %; and from about 0.2 wt. % to about 15 wt. % ZrO.sub.2. In embodiments, ZrO.sub.2 (wt. %)+P.sub.2O.sub.5 (wt. %) is greater than 3. When the precursor glass composition is converted to a glass-ceramic article, the glass-ceramic article may include grains having a longest dimension of less than 100 nm.

In embodiments, a precursor glass composition comprises from about 55 wt. % to about 80 wt. % SiO.sub.2; from about 2 wt. % to about 20 wt. % Al.sub.2O.sub.3; from about 5 wt. % to about 20 wt. % Li.sub.2O; greater than 0 wt % to about 3 wt. % Na.sub.2O; a non-zero amount of P.sub.2O.sub.5 less than or equal to 4 wt. %; and from about 0.2 wt. % to about 15 wt. % ZrO.sub.2. In embodiments, ZrO.sub.2 (wt. %)+P.sub.2O.sub.5 (wt. %) is greater than 3. When the precursor glass composition is converted to a glass-ceramic article, the glass-ceramic article may include grains having a longest dimension of less than 100 nm.

A colored glass article may include 50-80 mol % SiO.sub.2; 7-20 mol % Al.sub.2O.sub.3; 1-35 mol % R.sub.2O, wherein R.sub.2O comprises at least one of Li.sub.2O, Na.sub.2O, and K.sub.2O; 1×10.sup.−6-10 mol % of a colorant, wherein the colorant comprises at least one of Cr.sub.2O.sub.3, Au, Ag, CuO, NiO, Co.sub.3O.sub.4, TiO.sub.2, CeO.sub.2; and 12-24 mol % of Al.sub.2O.sub.3+MgO+CaO+ZnO. The colored glass article may have a transmittance color coordinate in the CIELAB color space with an L* value of 55 to 96.5. The colored glass article may have a compressive stress profile with a depth of compression ≥0.15t, a thickness t from 0.4 mm-5 mm, a compressive stress ≥200 MPa, and a central tension ≥60 MPa. The colored glass article may have a dielectric constant from 5.6 to 6.4 over the frequency range from 10 GHz to 60 GHz.

A colored glass article may include 50-80 mol % SiO.sub.2; 7-20 mol % Al.sub.2O.sub.3; 1-35 mol % R.sub.2O, wherein R.sub.2O comprises at least one of Li.sub.2O, Na.sub.2O, and K.sub.2O; 1×10.sup.−6-10 mol % of a colorant, wherein the colorant comprises at least one of Cr.sub.2O.sub.3, Au, Ag, CuO, NiO, Co.sub.3O.sub.4, TiO.sub.2, CeO.sub.2; and 12-24 mol % of Al.sub.2O.sub.3+MgO+CaO+ZnO. The colored glass article may have a transmittance color coordinate in the CIELAB color space with an L* value of 55 to 96.5. The colored glass article may have a compressive stress profile with a depth of compression ≥0.15t, a thickness t from 0.4 mm-5 mm, a compressive stress ≥200 MPa, and a central tension ≥60 MPa. The colored glass article may have a dielectric constant from 5.6 to 6.4 over the frequency range from 10 GHz to 60 GHz.

A colored glass article includes from 40 mol % to 70 mol % SiO.sub.2; from 8 mol % to 20 mol % Al.sub.2O.sub.3; from 1 mol % to 10 mol % B.sub.2O.sub.3; from 1 mol % to 20 mol % Li.sub.2O; from 1 mol % to 15 mol % Na.sub.2O; from 0 mol % to 8 mol % MgO; from 0 mol % to 5 mol % ZnO; and from 0.0005 mol % to 1 mol % Au. MgO+ZnO is from 0.1 mol % to 6 mol %.

A colored glass article includes from 40 mol % to 70 mol % SiO.sub.2; from 8 mol % to 20 mol % Al.sub.2O.sub.3; from 1 mol % to 10 mol % B.sub.2O.sub.3; from 1 mol % to 20 mol % Li.sub.2O; from 1 mol % to 15 mol % Na.sub.2O; from 0 mol % to 8 mol % MgO; from 0 mol % to 5 mol % ZnO; and from 0.0005 mol % to 1 mol % Au. MgO+ZnO is from 0.1 mol % to 6 mol %.

The present invention relates to a glass for a pharmaceutical container that is excellent in ultraviolet shielding ability, and is also excellent in chemical durability. The glass for a pharmaceutical container of the present invention includes as a glass composition, in terms of mass %, 67% to 81% of SiO.sub.2, more than 4% to 7% of Al.sub.2O.sub.3, 7% to 14% of B.sub.2O.sub.3, 3% to 12% of Na.sub.2O+K.sub.2O, 0% to 1.8% of CaO+BaO, 0.5% to less than 2% of Fe.sub.2O.sub.3, and 1% to 5% of TiO.sub.2, and satisfies a relationship of CaO/BaO≤0.5.

The present invention relates to a glass for a pharmaceutical container that is excellent in ultraviolet shielding ability, and is also excellent in chemical durability. The glass for a pharmaceutical container of the present invention includes as a glass composition, in terms of mass %, 67% to 81% of SiO.sub.2, more than 4% to 7% of Al.sub.2O.sub.3, 7% to 14% of B.sub.2O.sub.3, 3% to 12% of Na.sub.2O+K.sub.2O, 0% to 1.8% of CaO+BaO, 0.5% to less than 2% of Fe.sub.2O.sub.3, and 1% to 5% of TiO.sub.2, and satisfies a relationship of CaO/BaO≤0.5.

The present invention relates to a spinel glass-ceramic made from a composition with the components 25 to 50% by weight SiO.sub.2, 10 to 35% by weight Al.sub.2O.sub.3, 1 to 15% by weight MgO, 1 to 15% by weight P.sub.2O.sub.5, 1 to 25% by weight ZrO.sub.2 and/or TiO.sub.2, 0 to 20% by weight La.sub.2O.sub.3, 0 to 10% by weight B.sub.2O.sub.3, and 0 to 15% by weight additives. The spinel glass-ceramic contains at least one spinel phase, but no high quartz solid solution phase. The glass-ceramic according to the invention exhibits very high mechanical stability, for example, very high flexural strength, wherein its optical properties can be simultaneously adjusted. In addition, the present invention also relates to a method for producing and the use of the spinel glass-ceramic. Furthermore, the present invention relates to a shaped dental product containing the spinel glass-ceramic.

The present invention relates to a spinel glass-ceramic made from a composition with the components 25 to 50% by weight SiO.sub.2, 10 to 35% by weight Al.sub.2O.sub.3, 1 to 15% by weight MgO, 1 to 15% by weight P.sub.2O.sub.5, 1 to 25% by weight ZrO.sub.2 and/or TiO.sub.2, 0 to 20% by weight La.sub.2O.sub.3, 0 to 10% by weight B.sub.2O.sub.3, and 0 to 15% by weight additives. The spinel glass-ceramic contains at least one spinel phase, but no high quartz solid solution phase. The glass-ceramic according to the invention exhibits very high mechanical stability, for example, very high flexural strength, wherein its optical properties can be simultaneously adjusted. In addition, the present invention also relates to a method for producing and the use of the spinel glass-ceramic. Furthermore, the present invention relates to a shaped dental product containing the spinel glass-ceramic.