EFFECT OF SB ON PRESSURE-INDUCED TRANSFORMATION IN SE-TE GLASS

High pressure dc conductivity measurements, in the pressure range 0 le ss than or equal to P less than or equal to 3 GPa, for Se80-xTe20Sbx ( 0 less than or equal to x less than or equal to 9) are reported. Glass transition temperature (T-g) and X-ray diffraction (XRD) studies have also been performed on the samples before and after the pressure cycl e. Transformations, i.e. decrease of resistivity with pressure, are no t only rapid and continuous but also reversible with hysteresis, which decreases as the Sb content increases. The transformation pressure (P -s) also shifts towards lower pressure with the increase of Sb content . An attempt has been made to understand the results in the light of b andgap model for amorphous chalcogenide glasses.