| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass composition having such water resistance that a glass surface is not substantially altered even if allowed to stand in the air while having high ion conductivity, also having transparency and capable of polishing to an optical plane. SOLUTION: This glass composition contains, by weight, >=85%, in total of 18-22% Li2O, 45-60% P2O5, 10-30% Nb2O5, 3-8% Al2O3 and 0.3-6% (expressed in terms of fluorine) source of fluorine and <=15%, in total, of 0-7% Ta2O5, 0-3% SiO2, 0-13% B2O3, 0-2% at least one of Y2O3 and Ga2O3, 0-1% one or more selected from MgO, CaO, SrO, BaO, ZnO, CdO, PbO and FeO and 0-3% at least one of Na2O and K2O.
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