The effect of fluoride ions on the structure and crystallization kinetics of La_2O_3-containing diopside based oxyfluoride glasses

摘要

Oxyfluoride glasses in the system CaO-MgO-BaO-SiO_2-Al_2O_3-La_2O_3-CaF_2 were obtained by adding CaF_2 (3-8 wt percent ) to a parent diopside based glass composition, Ca_(0.8)Ba_(0.1)MgAl_(0.1)La_(0.1)Si_(1.9)O_6. 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.