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

Eleven glass compositions were prepared by melt and quench method with progressive substitution of SrO for PbO (0 a parts per thousand currency signaEuro parts per thousand x a parts per thousand currency sign 1 center dot 0) with a step-wise increment of 0 center dot 10 in the glass [(Pb (x) Sr1 -aEuro parts per thousand x )OTiO2]-[(2SiO(2)B(2)O(3))]-[BaO center dot K2O]center dot 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 (-aEuro parts per thousand 1) to study their different oxides structure systematically. Differential thermal analysis (DTA) was recorded from room temperature (similar to 27 A degrees C) to 1400 A degrees C employing a heating rate of 10 A degrees C /min to determine glass transition temperature, T (g) and crystallization temperature, T (c). The melting temperature, T (m), of these glass compositions was found to be in the range 597-1060 A degrees C depending on the composition under normal atmospheric conditions. T (g) and T (m) 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 a parts per thousand currency sign 0 center dot 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.