The effect of fluoride ions on the structure and crystallization kinetics of La2O3-containing diopside based oxyfluoride glasses

Oxyfluoride glasses in the system CaO–MgO–BaO–SiO2–Al2O3–La2O3–CaF2 were obtained by adding CaF2 (3–8 wt%) to a parent diopside based glass composition, Ca0.8Ba0.1MgAl0.1La0.1Si1.9O6. The characterization of the glasses has been made by density, dilatometry and FTIR measurements. Non-isothermal crystallization kinetic studies in conjunction with XRD and SEM have been employed in order to investigate the effects of fluoride ion additions on crystallization behaviour and mechanism of glasses.