| 摘要 |
The lead-free optical glasses have an index of refraction (nd) between 1.49 and 1.55 and an Abbé number (nud) between 47 and 59. They contain (in percent by weight on an oxide basis) 60 to 70, SiO2; 0.3 to 5, Al2O3; 16 to 25, Na2O; 0 to 9, TiO2; 0 to 7, advantageously 0.1 to 2, ZrO2; 0 to <0.5, Nb2O5; 0 to 7, Ta2O5 and 0 to 3, F. The lead-free optical glass is advantageously free of arsenic oxide, except for impurities, and contains antimony oxide as a fining agent.
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