| 摘要 |
A glass-ceramic which is substantially and desirably totally transparent, and which contains a predominant, orthosilicate crystal phase whose composition lies within the ternary Mg2SiO4-Zn2SiO4-Li4SiO4 system. The glass-ceramic is formed from precursor glasses having the following compositions, in weight percent on an oxide basis: 35-72 SiO2, 0-20 Al2O3, 0-40 ZnO, 0-18 MgO, 1-15 Li2O, 0-18 K2O, 0-8 Na2O, 0-8 P2O5, with the condition that SIGMAZnO+MgO>=7. The glass-ceramic may be doped with up to 1 wt. % chromium, oxide to impart optical activity thereto. |
