| 摘要 |
There are provided glass-ceramics containing, as a predominant crystal phase or phases, at least one selected from the group consisting of alpha-cristobalite, alpha-cristobalite solid solution, alpha-quartz and alpha-quartz solid solution, containing substantially no lithium disilicate (Li2O.2SiO2), lithium silicate (Li2O.SiO2), beta-spodumene, beta-eucryptite, alpha-quartz, mica or fluorrichterite, containing substantially no Cr ingredient or Mn ingredient, and having average linear thermal expansion coefficient within a range from +65x10-7/° C. to +140x10-7/° C. within a temperature range from -50° C. to +70° C., said predominant crystal phase or phases having an average crystal grain diameter of less than 0.10 mum. The glass-ceramics are suitable for use as a substrate for an information storage medium and also for use as a substrate for a light filter.
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