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Calorimetric studies and thermal stability of (Se 80Te 20)100-xGe x (x = 0, 2, 4 and 6) chalcogenide glasses by thermal analysis

MAINIKA1, S. S. BHATT2, NAGESH THAKUR1

Affiliation

  1. Department of Physics, Himachal Pradesh University, Shimla-5
  2. Department of Chemistry, Himachal Pradesh University, Shimla-5

Abstract

The crystallization kinetics and thermal stability of the (Se80Te20) 100-xGe x (x = 0, 2, 4 and 6) glassy alloys are made at different heating rates (10, 15, 20 and 25 o C/min) under non-isothermal conditions using simultaneous thermal analysis (TG/DTA). Well defined endothermic and exothermic peaks are obtained at glass transition (Tg) and crystallization temperatures (Tc). From the dependence of the glass transition temperature on the heating rate (β), the activation energy of glass transition (E t) has been calculated on the basis of Kissinger model. It has been found that the T g and Et increases with the increasing Ge content in Se-Te glassy alloy. The thermal stability of the studied glasses has been evaluated using various thermal stability criteria ((Tc - Tg), thermal stability parameter (S), Hruby parameter (Hr) and reduced glass transition temperature (T rg)), based on the characteristic temperatures such as the glass transition temperature, the crystallization temperature and the melting temperature (T m)..

Keywords

Glass transition activation energy, Glass transition temperature, Hruby parameter Thermal stability parameter, Reduced glass transition temperature.

Submitted at: Oct. 30, 2009
Accepted at: Nov. 19, 2009

Citation

MAINIKA, S. S. BHATT, NAGESH THAKUR, Calorimetric studies and thermal stability of (Se 80Te 20)100-xGe x (x = 0, 2, 4 and 6) chalcogenide glasses by thermal analysis, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 11, pp. 1860-1864 (2009)