Alkali-doped boroaluminosilicate glasses are provided. The glasses include the network formers SiO.sub.2, B.sub.2O.sub.3, and Al.sub.2O.sub.3. The glass may, in some embodiments, have a Young's modulus of less than about 65 GPa and/or a coefficient of thermal expansion of less than about 40×10.sup.−7/° C. The glass may be used as a cover glass for electronic devices, a color filter substrate, a thin film transistor substrate, or an outer clad layer for a glass laminate.

Photosensitive lithium zinc aluminosilicate glasses that can be selectively irradiated and cerammed to provide patterned regions of glass and lithium-based glass ceramic, and composite glass articles made from such glasses and glass ceramics are provided. The lithium zinc aluminosilicate glass can be negatively photosensitive or positively photosensitive to radiation having a wavelength in a range from about 248 nm to about 360 nm.

Photosensitive lithium zinc aluminosilicate glasses that can be selectively irradiated and cerammed to provide patterned regions of glass and lithium-based glass ceramic, and composite glass articles made from such glasses and glass ceramics are provided. The lithium zinc aluminosilicate glass can be negatively photosensitive or positively photosensitive to radiation having a wavelength in a range from about 248 nm to about 360 nm.

A glass sheet of the present invention has a content of Li.sub.2O+Na.sub.2O+K.sub.2O of from 0 mol % to less than 1.0 mol % and a content of B.sub.2O.sub.3 of from 0 mol % to less than 2.0 mol % in a glass composition, has a β-OH value of less than 0.20/mm, and has a thermal shrinkage ratio of 20 ppm or less when increased in temperature from normal temperature at a rate of 5° C./min, kept at a temperature of 500° C. for 1 hour, and decreased in temperature at a rate of 5° C./min.

A bioactive glass-ceramic composition as defined herein. Also disclosed are methods of making and using the disclosed compositions.

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.

An active material includes silicon, oxygen, a first element, a second element, and a third element. The first element includes boron, phosphorus, or both. The second element includes at least one of an alkali metal element, a transition element, or a typical element. The third element includes the alkaline earth metal element. A content of silicon is greater than or equal to 60 at % and less than or equal to 98 at %. A content of the first element is greater than or equal to 1 at % and less than or equal to 25 at %. A content of the second element is greater than or equal to 1 at % and less than or equal to 34 at %. A content of the third element is greater than or equal to 0 at % and less than or equal to 6 at %.

An active material includes silicon, oxygen, a first element, a second element, and a third element. The first element includes boron, phosphorus, or both. The second element includes at least one of an alkali metal element, a transition element, or a typical element. The third element includes the alkaline earth metal element. A content of silicon is greater than or equal to 60 at % and less than or equal to 98 at %. A content of the first element is greater than or equal to 1 at % and less than or equal to 25 at %. A content of the second element is greater than or equal to 1 at % and less than or equal to 34 at %. A content of the third element is greater than or equal to 0 at % and less than or equal to 6 at %.

A glass article including at least about 40 mol % SiO.sub.2 and, optionally, a colorant imparting a preselected color is disclosed. In general, the glass includes, in mol %, from about 40-70 SiO.sub.2, 0-25 Al.sub.2O.sub.3, 0-10 B.sub.2O.sub.3; 5-35 Na.sub.2O, 0-2.5 K.sub.2O, 0-8.5 MgO, 0-2 ZnO, 0-10% P.sub.2O.sub.5 and 0-1.5 CaO. As a result of ion exchange, the glass includes a compressive stress (σ.sub.s) at at least one surface and, optionally, a color. In one method, communicating a colored glass with an ion exchange bath imparts σ.sub.s while in another; communicating imparts σ.sub.s and a preselected color. In the former, a colorant is part of the glass batch while in the latter; it is part of the bath. In each, the colorant includes one or more metal containing dopants formulated to impart to a preselected color. Examples of one or more metal containing dopants include one or more transition and/or rare earth metals.