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EFFECT OF SOME METALLIC ADDITIVES ON THE KINETICS OF GLASS TRANSITION IN Se80Te20 GLASSY ALLOY

N. Mehta1, R. K. Shukla1, A. Kumar1,*

Affiliation

  1. Department of Physics, Harcourt Butler Technological Institute, Kanpur – 208 002, India

Abstract

Calorimetric measurements have been performed in glassy alloys Se80Te20 and Se70Te20M10 (M = Ag, Cd, Sb) to study the effect of these metallic additives on the kinetics of glass transition in glassy Se80Te20 alloy. The variation of Tg with heating rate and composion has been studied. It has been found that inceasing sequence of Tg at all the heating rates in ternary glasses is same as that of the atomic weight of third element. Thus, we can conclude that Tg in these glasses increases wih increase in their mean atomic weights. The activation energy of glass transition process ( Et) has been calculated using the theory of glass transition kinetics and structural relaxation as developed by Moynihan and other workers.It is found that the kinetics of glass transition depends on the addition of third element. The difference (Tc–Tg) which is the indicator of glass forming tendency (GFT), has been determined by DSC thermograms for each sample. The activation energy of glass transition process ( Et) is found to be related with (Tc–Tg)..

Keywords

Chalcogenide glasses, Differential scanning calorimetry, Glass transition kinetics, Thermal relaxation.

Submitted at: July 26, 2004
Accepted at: Dec. 6, 2004

Citation

N. Mehta, R. K. Shukla, A. Kumar, EFFECT OF SOME METALLIC ADDITIVES ON THE KINETICS OF GLASS TRANSITION IN Se80Te20 GLASSY ALLOY, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 4, pp. 1185-1192 (2004)