| 摘要 |
This invention is directed to spontaneous opal glasses wherein Ba2F(PO4) constitutes the predominant crystalline opal phase. The glasses exhibit softening points in excess of 710 DEG C., excellent chemical durability, and consist essentially, in weight percent on the oxide basis, of 6-10% Na2O, 1-6% K2O, 4-11% BaO, 9-18% Al2O3, 50-70% SiO2, 3.5-7% P2O5, and 1-4% F.
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