Abstract

Abstract Transparent and clear glasses were prepared from the MAS system (based on MgO-Al 2 O 3 -SiO 2 ) with different fluorine contents. Their crystallization behaviour to giving mica glass-ceramics upon heat treatment was studied as a function of the source of fluorine and its concentration. The predominant crystalline phase in these glass-ceramics is fluoborite, norbergite, or fluorphlogopite, depending on the heattreatment temperature, fluorine source, and concentration. An interlocking microstructure of fluorphlogopite in a glassy matrix is observed above 870°C.

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