Abstract

Abstract Two glasses with different contents of fluorine were fabricated. A single phase, KMg 3.25 Si 3.625 O 10 F 2 , precipitated in both of the glass samples after heat treatment. Both the crystallization activation energy ( En ) and the frequency factor ( ν ) increased with increasing fluorine content. This means that the fluorine content has a dual effect on the crystallization of fluorosilicic mica glass; the effect on the frequency factor is predominant. The flexural strength of the as-cerammed glass ceramic containing more fluorine is larger than that containing less fluorine when heated to the same temperature.

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