| 摘要 |
The present invention relates to the production of lead-free glasses exhibiting densities of at least 2.9 g/cm3 and refractive indices of at least 1.545 which consist essentially, in weight percent, of -SiO2 51-63 Al2O3 0-5 -Li2O 0-3 ZrO2 0-6 -Na2O 0-8 SiO2 + Al2O3 + 55-66 - ZrO2 -K2O 0-12 TiO2 0-3 -Li2O + Na2O + 7-15 CaO 0-5 -K2O -SrO 0-<8 MgO 0-3 -BaO >13-21 B2O3 0-3 -ZnO 5-15 La2O3 0-8. -SrO + BaO + 27-34 -
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