| 摘要 |
In this glass for a magnetic recording medium substrate, the content of SiO2 is 56-75%, the content of Al2O3 is 0.1-10%, the content of Li2O is 0-2%, the total content of Na2O and K2O is 3-15%, the total content of MgO, CaO and SrO is 14-35%, the content of Ti oxides is 0.20-2.50%, the total content of Sn oxides and Ce oxides is 0.10-1.55% and the content of Sb oxides is 0-0.02%, each in terms of mol.%. The molar ratio of the content of Li2O relative to the total content of SiO2 and Al2O3 {Li2O / (SiO2+Al2O3)} is 0.02 or lower, and the glass transition temperature is 600°C or higher. |
