Influence of fluorine content on the crystallization and microstructure of barium fluorphlogopite glass-ceramics

The effect of varying the fluorine content on the nucleation and crystallization behavior of barium containing glasses based on the system BaO·4MgO·Al2O3·6SiO2·2MgF2 was investigated by differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Both the crystallization peak temperature (Tp) and activation energies (E) decreased, the Avrami exponent (n) and pre-exponential factor (ν) increased. The results suggest that fluorine increases the rate of diffusion in the glass and promotes initial crystallization in barium fluorphlogopite glasses.