EFFECT OF K2O ADDITION ON CRYSTALLIZATION AND MICROSTRUCTURAL BEHAVIOR OF THE STRONTIUM TITANATE-BOROSILICATE GLASS-CERAMIC SYSTEM

The crystallization and microstructural behaviour of glass ceramics in the system (SrO . TiO2)-(SiO2 . B2O3) with varying wt% of K2O have be en investigated. The glass samples were crystallized based on DTA stud ies. Crystalline phases were identified by X-ray diffraction. The addi tion of K2O in the parent glass composition plays an important role in the precipitation of different crystalline phases in glassy matrix an d controls the microstructure of the resulting glass ceramic. In our s tudies it has been observed that careful selection of the K2O content and heat-treatment conditions results in crystallization of strontium titanate as the major phase.