| 摘要 |
PROBLEM TO BE SOLVED: To provide a substrate for an information recording medium comprising a crystallized glass and having high Young's modulus, strength and thermal durability, being excellent in flatness, uniformity and processability of the surface, and which can be manufactured at the low cost because the liquid phase temperature of the glass is relatively low; and to provide an information recording medium using this substrate. SOLUTION: This crystallized glass substrate for an information recording medium comprises 35-65 mol% of SiO2, 5-25 mol% of Al2O3, 10-40 mol% of MgO and 5-15 mol% of TiO2, wherein the total of the above components is at least 92 mol% and the main crystals are enstatite and/or its solid solution. This information recording medium has a layer for recording formed on the above substrate.
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