Glass for use in substrate for information recording medium, substrate for information recording medium and information recording medium, and their manufacturing method
作者： Mikio Ikenishi , Kazuo Tachiwana , Yoichi Hachitani , Kinobu Osakabe , Xuelu Zou
DOI:
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摘要: According to one aspect of the present invention, provided is glass for use in substrate information recording medium, which comprises, denoted as molar percentages, a total 70 85 percent SiO2 and Al2O3, where content equal or greater than 50 Al2O3 3 percent; 10 Li2O, Na2O K2O; 1 6 CaO MgO, MgO content; 0 but lower 4 ZrO2, HfO2, Nb2O5, Ta2O5, La2O3 Y2O3 TiO2; with ratio K2O SiO2, La2O3, TiO2 ((Li2O+Na2O+K2O)/(SiO2+Al2O3+ZrO2+HfO2+Nb2O5+Ta2O5+La2O3+Y2O3+TiO2)) being less 0.28. Further are medium their manufacturing methods according invention.
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