| 摘要 |
Glass-ceramics include SiO<SUB>2</SUB>, Al<SUB>2</SUB>O<SUB>3 </SUB>and Li<SUB>2</SUB>O on oxide basis. In the glass-ceramics, total amount in mass % of SiO<SUB>2 </SUB>and Al<SUB>2</SUB>O<SUB>3 </SUB>is less than 77% and Li<SUB>2</SUB>O/(SiO<SUB>2</SUB>+Al<SUB>2</SUB>O<SUB>3</SUB>) which is the ratio in mass % of the amount of Li<SUB>2</SUB>O to the total amount of SiO<SUB>2 </SUB>and Al<SUB>2</SUB>O<SUB>3 </SUB>is 0.064 or over. The glass-ceramics include at least one crystal phase selected from the group consisting of beta-quartz, beta-quartz solid solution, beta-eucryptite, beta-eucryptite solid solution, beta-spodumene and beta-spodumene solid solution.
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