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

摘要

The effect of varying the fluorine content on the nucleation and crystallization behavior of barium containing glasses based on the system BaO centre dot 4MgO centre dot Al_2O_3 centre dot 6SiO_2 centre dot 2MgF_2 was investigated by differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Both the crystallization peak temperature (T_p) and activation energies (E) decreased, the Avrami exponent (n) and pre-exponential factor (nu) increased. The results suggest that fluorine increases the rate of diffusion in the glass and promotes initial crystallization in barium fluorphlogopite glasses.