| 摘要 |
<p>An optical and ophthalmic glass having an index of refraction of >/=1.69, an Abbe number of >/=37, and a density of </=3.30 g/cm3, consists essentially of (in % by weight): -SiO2 18-36 -B2O3 3-18 -GeO2 0-8 -Al2O3 0-6, -wherein SiO2 + B2O3 + Al2O3 + GeO2 = 25-39 -P2O5 0-14, -wherein SiO2 + B2O3 + Al2O3 + GeO2 + P2O5 = 30-44 -Li2O 0-12 -Na2O 0-14 -K2O 0-18 -Li2O + Na2O + K2O = 2-18 -MgO 0-15 -CaO 7-25 -MgO + CaO 15-32 -SrO 0-13 -BaO 0-17 -ZnO 0-15 -PbO 0-10 -SrO + BaO + ZnO + PbO 0-20 -TiO2 3-14 -Nb2O5 0-13 -WO3 0-10 -TiO2 + Nb2O5 + WO3 = 10-21 -ZrO2 0-15, -La2O3 0-20 -Y2O3 0-16 -Gd2O3 0-16 -Yb2O3 0-10 -La2O3 + Y2O3 + Gd2O3 + Yb2O3 = 0-20 -Ta2O5 0-13 -HfO2 0-5 -SnO2 0-6. -</p> |
