Glass compositions include phosphorus oxide (P.sub.2O.sub.5), niobia (Nb.sub.2O.sub.5), titania (TiO.sub.2), potassium oxide (K.sub.2O) and calcium oxide (CaO) as essential components and may optionally include barium oxide (BaO), sodium oxide (Na.sub.2O), lithium oxide (Li.sub.2O), tungsten oxide (WO.sub.3), bismuth oxide (Bi.sub.2O.sub.3), tantalum oxide (Ta.sub.2O.sub.5), silica (SiO.sub.2) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.

Glass compositions include phosphorus oxide (P.sub.2O.sub.5), niobia (Nb.sub.2O.sub.5), titania (TiO.sub.2), potassium oxide (K.sub.2O) and calcium oxide (CaO) as essential components and may optionally include barium oxide (BaO), sodium oxide (Na.sub.2O), lithium oxide (Li.sub.2O), tungsten oxide (WO.sub.3), bismuth oxide (Bi.sub.2O.sub.3), tantalum oxide (Ta.sub.2O.sub.5), silica (SiO.sub.2) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.

Glass compositions include phosphorus oxide (P.sub.2O.sub.5), niobia (Nb.sub.2O.sub.5), barium oxide (BaO) and potassium oxide (K.sub.2O) as essential components and may optionally include titania (TiO.sub.2), calcium oxide (CaO), sodium oxide (Na.sub.2O), lithium oxide (Li.sub.2O), bismuth oxide (Bi.sub.2O.sub.3), strontium oxide (SrO), tungsten oxide (WO.sub.3) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.

Glass compositions include phosphorus oxide (P.sub.2O.sub.5), niobia (Nb.sub.2O.sub.5), barium oxide (BaO) and potassium oxide (K.sub.2O) as essential components and may optionally include titania (TiO.sub.2), calcium oxide (CaO), sodium oxide (Na.sub.2O), lithium oxide (Li.sub.2O), bismuth oxide (Bi.sub.2O.sub.3), strontium oxide (SrO), tungsten oxide (WO.sub.3) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.

Glass compositions include phosphorus oxide (P.sub.2O.sub.5), niobia (Nb.sub.2O.sub.5), barium oxide (BaO) and potassium oxide (K.sub.2O) as essential components and may optionally include titania (TiO.sub.2), calcium oxide (CaO), sodium oxide (Na.sub.2O), lithium oxide (Li.sub.2O), bismuth oxide (Bi.sub.2O.sub.3), strontium oxide (SrO), tungsten oxide (WO.sub.3) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.

Glass compositions include phosphorus oxide (P.sub.2O.sub.5), niobia (Nb.sub.2O.sub.5), barium oxide (BaO) and potassium oxide (K.sub.2O) as essential components and may optionally include titania (TiO.sub.2), calcium oxide (CaO), sodium oxide (Na.sub.2O), lithium oxide (Li.sub.2O), bismuth oxide (Bi.sub.2O.sub.3), strontium oxide (SrO), tungsten oxide (WO.sub.3) and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low density at room temperature.

Provided is oxide glass in which a content of P.sup.5+ is 7 to 43 cation %, a content of Nb ions is 10 to 21 cation %, a content of Li.sup.+ is 20 cation % or more, a total content of Nb ions and Li.sup.+ is 48 to 70 cation %, a content of Bi ions is more than 0 cation % and is equal to or less than 6 cation %, a content of Ba.sup.2+ is 5 cation % or less, a content of Zr.sup.4+ is 2 cation % or less, a total content of Ti ions and W ions is 5 cation % or less, and a cation ratio of the content of Li.sup.+ to a total content of Li.sup.+, Na.sup.+, and K.sup.+[Li.sup.+/(Li.sup.++Na.sup.++K.sup.+)] is 0.5 or more.

Provided is oxide glass in which a content of P.sup.5+ is 7 to 43 cation %, a content of Nb ions is 10 to 21 cation %, a content of Li.sup.+ is 20 cation % or more, a total content of Nb ions and Li.sup.+ is 48 to 70 cation %, a content of Bi ions is more than 0 cation % and is equal to or less than 6 cation %, a content of Ba.sup.2+ is 5 cation % or less, a content of Zr.sup.4+ is 2 cation % or less, a total content of Ti ions and W ions is 5 cation % or less, and a cation ratio of the content of Li.sup.+ to a total content of Li.sup.+, Na.sup.+, and K.sup.+[Li.sup.+/(Li.sup.++Na.sup.++K.sup.+)] is 0.5 or more.

The present disclosure provides glass, which has a composition expressed in terms of mole percent, comprising: P.sub.2O.sub.5: 38 to 65%; Al.sub.2O.sub.3: 2 to 15%; CuO: 8 to 25%; Rn.sub.2O: 5 to 40%; RO: 1 to 30%; and V.sub.2O.sub.5: 0 to 3%, wherein Li.sub.2O/Rn.sub.2O is 0.4 to 1.0, and (Li.sub.2O+CuO)/P.sub.2O.sub.5 is 0.3 to 1.2; wherein the content of Rn.sub.2O is the total content of Li.sub.2O, Na.sub.2O, and K.sub.2O; and wherein the content of RO is the total content of MgO, CaO, SrO, and BaO. Through reasonable component design, the glass obtained by the present disclosure has excellent crystallization resistance in the case of high Cu content; moreover, the glass of the present disclosure is suitable for chemical strengthening, and the glass products obtained after chemical strengthening have excellent bending strength.

The present disclosure provides glass, which has a composition expressed in terms of mole percent, comprising: P.sub.2O.sub.5: 38 to 65%; Al.sub.2O.sub.3: 2 to 15%; CuO: 8 to 25%; Rn.sub.2O: 5 to 40%; RO: 1 to 30%; and V.sub.2O.sub.5: 0 to 3%, wherein Li.sub.2O/Rn.sub.2O is 0.4 to 1.0, and (Li.sub.2O+CuO)/P.sub.2O.sub.5 is 0.3 to 1.2; wherein the content of Rn.sub.2O is the total content of Li.sub.2O, Na.sub.2O, and K.sub.2O; and wherein the content of RO is the total content of MgO, CaO, SrO, and BaO. Through reasonable component design, the glass obtained by the present disclosure has excellent crystallization resistance in the case of high Cu content; moreover, the glass of the present disclosure is suitable for chemical strengthening, and the glass products obtained after chemical strengthening have excellent bending strength.