Synthesis, IR, crystallization and dielectric study of (Pb, Sr)TiO 3 borosilicate glass-ceramics

Abstract

Eleven glass compositions were prepared by melt and quench method with progressive substitution of SrO for PbO (0 ≤ × ≤ 1·0) with a step-wise increment of 0·10 in the glass [(PbxSr 1-x)OTiO2]-[(2SiO2B2O 3)]-[BaO·K2O]·Nb2O5 (mol percentage) system. The infrared spectra (IR) of various glass compositions in the above mentioned glass system was recorded over a continuous spectral range 400-4000 cm-1 to study their different oxides structure systematically. Differential thermal analysis (DTA) was recorded from room temperature (∼27 °C) to 1400 °C employing a heating rate of 10 °C/min to determine glass transition temperature, Tg and crystallization temperature, Tc. The melting temperature, T m, of these glass compositions was found to be in the range 597-1060 °C depending on the composition under normal atmospheric conditions. T g and Tm of glasses were found to increase with increasing SrO content. X-ray diffraction analysis of these glass-ceramic samples shows that major crystalline phase of the glass-ceramic sample with x ≤ 0·5 was found to have cubic structure similar to SrTiO3 ceramic. Scanning electron microscopy has been carried out to see the surface morphology of the crystallites dispersed in the glassy matrix. © Indian Academy of Sciences.