| 摘要 |
A glass composition including, in oxide-based mol %: (a) at least 30% and at most 50% P2O5, (b) at least 10% and at most 50% ZnO, (c) at least 0.1% and at most 10% Al2O3, (d) at least 0% and at most 50% Li2O, (e) at least 0% and at most 50% Na2O, (f) at least 0% and at most 50% K2O, (g) at least 0% and at most 20% MgO, (h) at least 0% and at most 20% CaO, (i) at least 0% and at most 20% SrO, (j) at least 0% and at most 20% BaO, (k) at least 0% and at most 20% SnO, and (1) at least 0% and at most 5% B2O3, substantially not comprising ZrO2 and Ag2O, and (a)/(b), the ratio of (a) and (b), being at least 0.2 and at most 2.0.
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