influence of heat treatment on crystallization and transparency of glass-ceramics containing lithium-mica nanocrystals

in this study, the preparation of transparent glass-ceramics with lithium-mica nanocrystals by melting-quenching method was investigated. the effect of heat treatment time and temperature on the crystalline phases, microstructure and transparency of the samples were studied. in order to obtain a fine microstructure, an optimum condition for heat treatment has been found to be very important in controlling the crystallization process. the optimum condition of crystallization process was obtained by heating at 655˚c for 15 hours. the crystallization process of glasses was investigated by dta, xrd and sem techniques. transparent glass-ceramics in which a large amount of lithium-mica with the particle size of less than 50 nm was separated, was prepared using the optimum conditions of heat treatment.