A light guide plate includes: an optical glass, the optical glass having a refractive index n.sub.d of at least 1.75 or of at least 1.80 and including Nb.sub.2O.sub.5 in an amount of at least 15 mol % and P.sub.2O.sub.5 in an amount of at least 19 mol %, the light guide plate having an internal transmission of at least 0.80 or of at least 0.90, measured at a wavelength of 440 nm and a sample thickness of 10 mm.

To provide: an optical glass having a high refractive index and a relatively low specific gravity; and a corresponding optical element.

An optical glass which has a refractive index nd of 1.80 to 2.00 and an Abbe number vd of 17 to 22, contains 25 to 40 mass % of P.sub.2O.sub.5, 15 to 40 mass % of Nb.sub.2O.sub.5, 10 to 35 mass % of TiO.sub.2, 3 to 12 mass % of B.sub.2O.sub.3, 0 to 15 mass % of BaO, greater than 0 mass % and 10 mass % or less of Li.sub.2O, greater than 0 mass % and 15 mass % or less of a total of Li.sub.2O, Na.sub.2O, K.sub.2O, and Cs.sub.2O [Li.sub.2O+Na.sub.2O+K.sub.2O+Cs.sub.2O], has a mass ratio [TiO.sub.2/(Nb.sub.2O.sub.5+TiO.sub.2+WO.sub.3+Bi.sub.2O.sub.3+Ta.sub.2O.sub.5)] of TiO.sub.2 to the total of Nb.sub.2O.sub.5, TiO.sub.2, WO.sub.3, Bi.sub.2O.sub.3, and Ta.sub.2O.sub.5 of 0.33 to 0.60, and does not substantially contain F.

To provide: an optical glass having a high refractive index and a relatively low specific gravity; and a corresponding optical element.

An optical glass which has a refractive index nd of 1.80 to 2.00 and an Abbe number vd of 17 to 22, contains 25 to 40 mass % of P.sub.2O.sub.5, 15 to 40 mass % of Nb.sub.2O.sub.5, 10 to 35 mass % of TiO.sub.2, 3 to 12 mass % of B.sub.2O.sub.3, 0 to 15 mass % of BaO, greater than 0 mass % and 10 mass % or less of Li.sub.2O, greater than 0 mass % and 15 mass % or less of a total of Li.sub.2O, Na.sub.2O, K.sub.2O, and Cs.sub.2O [Li.sub.2O+Na.sub.2O+K.sub.2O+Cs.sub.2O], has a mass ratio [TiO.sub.2/(Nb.sub.2O.sub.5+TiO.sub.2+WO.sub.3+Bi.sub.2O.sub.3+Ta.sub.2O.sub.5)] of TiO.sub.2 to the total of Nb.sub.2O.sub.5, TiO.sub.2, WO.sub.3, Bi.sub.2O.sub.3, and Ta.sub.2O.sub.5 of 0.33 to 0.60, and does not substantially contain F.

Glass comprising a colored layer, wherein the glass contains one or more glass components selected from the group consisting of Sb ions, As ions, Sn ions, and Ce ions in an amount of 0.075 cation % or more.

Glass comprising a colored layer, wherein the glass contains one or more glass components selected from the group consisting of Sb ions, As ions, Sn ions, and Ce ions in an amount of 0.075 cation % or more.

The present disclosure provides a glass ceramic composite electrolyte comprising gadolinium doped ceria and glass composite with desired ionic conductivity in the temperature range of 400 to 600° C., suitable for applications in solid oxide fuel cells. Also disclosed is a process for the preparation of the glass ceramic composite electrolyte.

A conductive paste for forming a solar cell electrode, including: a conductive powder containing silver as a main component; glass frit; and an organic vehicle, wherein the glass frit contains tellurium glass frit having tellurium oxide as a network-forming component. The conductive paste of the present invention makes it possible to form a solar cell electrode having a low dependence on firing temperature without causing problems due to fire-through into the substrate, and to thereby obtain a solar cell having good solar cell characteristics.

A conductive paste for forming a solar cell electrode, including: a conductive powder containing silver as a main component; glass frit; and an organic vehicle, wherein the glass frit contains tellurium glass frit having tellurium oxide as a network-forming component. The conductive paste of the present invention makes it possible to form a solar cell electrode having a low dependence on firing temperature without causing problems due to fire-through into the substrate, and to thereby obtain a solar cell having good solar cell characteristics.

What is disclosed is a lead-free glass, which is a V.sub.2O.sub.5—TeO.sub.2—RO (at least one selected from the group consisting of MgO, CaO, SrO, and BaO)—ZnO glass and has a low softening point, comprising: 5-55 wt % of V.sub.2O.sub.5, 5-75 wt % of TeO.sub.2, 1-25 wt % of RO (at least one selected from the group consisting of MgO, CaO, SrO, and BaO) in total, 0.1-6 wt % of ZnO, and 0.1-3 wt % of R.sub.2O (at least one selected from the group consisting of Li.sub.2O, Na.sub.2O, and K.sub.2O) in total. This glass can be used as a sealing material providing fluidity which is capable of being sealed at a temperature of 400° C. or less

What is disclosed is a lead-free glass, which is a V.sub.2O.sub.5—TeO.sub.2—RO (at least one selected from the group consisting of MgO, CaO, SrO, and BaO)—ZnO glass and has a low softening point, comprising: 5-55 wt % of V.sub.2O.sub.5, 5-75 wt % of TeO.sub.2, 1-25 wt % of RO (at least one selected from the group consisting of MgO, CaO, SrO, and BaO) in total, 0.1-6 wt % of ZnO, and 0.1-3 wt % of R.sub.2O (at least one selected from the group consisting of Li.sub.2O, Na.sub.2O, and K.sub.2O) in total. This glass can be used as a sealing material providing fluidity which is capable of being sealed at a temperature of 400° C. or less