Synthesis, crystallisation and microstructural study of perovskite (Ba,Sr)TiO3 borosilicate glass ceramic doped with La 2O3

Abstract

Various glass samples, of glass system [(Ba1-xSr x)TiO3]-[2SiO2-B2O 3]-K2O with addition of La2O3, were prepared by melt quenched method. Differential thermal analysis of glass samples was carried out in the temperature range of 100-1200μC in order to study the kinetics of crystallisation behaviour. Glass samples were subjected to appropriate heat treatment schedules for their suitable crystallisation from glass to glass ceramics. X-ray diffraction analysis of glass ceramic samples indicated the presence of major crystalline phase of BaTiO3 along with some secondary phases of Ba2TiSi2O8 and Ba2Ti2B2O9. Scanning electron microscopy measurements were also performed to see the morphology of crystallites of the major/secondary phase formation in the glass ceramic samples. We found that La2O3 played an important role to increase nucleation and growth of the crystallites in the glassy matrix. © W. S. Maney & Son Ltd. 2013.