Influence of B ₂ O ₃ on Crystallization Behavior and Microstructure of Mica Glass‐Ceramics in the System BaO ·4 MgO · Al ₂ O ₃ ·6 SiO ₂ ·2 MgF ₂

Abstract

The effect of varying B 2 O 3 content on the crystallization and microstructure behavior of barium‐containing glasses based on the system BaO ·4 MgO · Al 2 O 3 ·6 SiO 2 ·2 MgF 2 was investigated by differential thermal analysis ( DTA ), X‐ray diffraction, and scanning electron microscopy. Heat treatment of glass specimens in the form of fine powders in the range of 884°C–901°C led to the formation of barium fluorophlogopite. DTA study revealed that the glass transition temperature ( T g ) and crystallization peak temperature ( T p ) decreased by increasing B 2 O 3 content. It was also found that the higher the B 2 O 3 content, the higher the aspect ratio of fluorophlogopite crystal.