Glass compositions include boron oxide (B.sub.2O.sub.3), lanthanum oxide (La.sub.2O.sub.3), titania (TiO.sub.2) and niobia (Nb.sub.2O.sub.5) as essential components and may optionally include silica (SiO.sub.2), tungsten oxide (WO.sub.3), zirconia (ZrO.sub.2), yttria (Y.sub.2O.sub.3), bismuth oxide (Bi.sub.2O.sub.3), barium oxide (BaO), TeO.sub.2 and other components. The glasses may be characterized by high refractive index at 587.56 nm at comparably low liquidus temperature.

Provided is optical glass containing, in terms of mol % of cations: 10 to 60% of a La.sup.3+ component; more than 0% and up to 75% of a Ga.sup.3+ component; and 5 to 75% of a Nb.sup.5+ component, in which a total amount of the La.sup.3+ component, Ga.sup.3+ component, and Nb.sup.5+ component is 60 to 100%.

Provided is optical glass containing, in terms of mol % of cations: 10 to 60% of a La.sup.3+ component; more than 0% and up to 75% of a Ga.sup.3+ component; and 5 to 75% of a Nb.sup.5+ component, in which a total amount of the La.sup.3+ component, Ga.sup.3+ component, and Nb.sup.5+ component is 60 to 100%.

An optical boroaluminate glass article comprises: from greater than or equal to 10.0 mol % to less than or equal to 30.0 mol % Al.sub.2O.sub.3; from greater than or equal to 10.0 mol % to less than or equal to 55.0 mol % CaO; from greater than or equal to 10.0 mol % to less than or equal to 25.0 mol % B.sub.2O.sub.3; from greater than or equal to 0.0 mol % to less than or equal to 30.0 mol % SiO.sub.2; and from greater than or equal to 1.0 mol % to less than or equal to 20.0 mol % refractive index raising components. The optical boroaluminate glass article has a refractive index of the glass article, measured at 589.3 nm, of greater than or equal to 1.62, and a density of less than or equal to 4.00 g/cm.sup.3.

An optical glass includes, in terms of mol % of cations, a total amount of La.sup.3+, Y.sup.3+, and Gd.sup.3+ components falling within a range of from 5% to 65% and a total amount of Zr.sup.4+, Hf.sup.4+, and Ta.sup.5+ components failing within a range of from 5% to 65%, and a relationship expressed in Expression (1) given below is satisfied. (La.sup.3++Y.sup.3++Gd.sup.3+)×(Zr.sup.4+ Hf.sup.4++Ta.sup.3+)≥400(%).sup.2.

A decorative glass article contains: in mol %, 10% to 70% of La.sub.2O.sub.3, 10% to 90% of Nb.sub.2O.sub.5, 0% to 40% of B.sub.2O.sub.3, and 0% to 50% of TiO.sub.2, wherein a refractive index is 2.0 or more and an Abbe number is 50 or less.

A decorative glass article contains: in mol %, 10% to 70% of La.sub.2O.sub.3, 10% to 90% of Nb.sub.2O.sub.5, 0% to 40% of B.sub.2O.sub.3, and 0% to 50% of TiO.sub.2, wherein a refractive index is 2.0 or more and an Abbe number is 50 or less.

The present disclosure relates to a lithium ion conductive material, preferably a lithium ion conductive glass ceramic, the material including a garnet-type crystalline phase content and an amorphous phase content. The material has a sintering temperature of 1000° C. or lower, preferably 950° C. or lower and an ion conductivity of at least 1*10.sup.−5 S/cm, preferably at least 2*10.sup.−5 S/cm, preferably at least 5*10.sup.−5 S/cm, preferably at least 1*10.sup.−4 S/cm, and the amorphous phase content includes boron and/or a composition including boron.

A decorative glass article is substantially free of lead oxide, and has a refractive index of 1.9 or more and an Abbe number of 42 or less.

A decorative glass article is substantially free of lead oxide, and has a refractive index of 1.9 or more and an Abbe number of 42 or less.