| 摘要 |
PROBLEM TO BE SOLVED: To provide a crystallized glass substrate which has a high thermal expansion coefficient in spite of its low corrosion by alkali metal components and has good workability. SOLUTION: This crystallized glass substrate for an information recording medium contains each component of, by weight, 65 to 70% SiO2, 5 to 10% Al2O3, 4 to 8% Li2O, 1 to 5% ZrO2 and 1 to 3% P2O5.
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