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The Study of the theoretical parameters of Ge Sn substituted Pb based quaternary chalcogenide glasses at their rigidity percolation threshold

VIVEK MODGIL1,* , V. S. RANGRA1

Affiliation

  1. Department of Physics, H. P. University, Summer Hill Shimla (171005) India

Abstract

In the present paper we have theoretically studied the quaternary chalcogenide glass system Pb9Se71Ge20-xSnx (where x = 8, 9,10,11,12 at.%) at rigidity percolation threshold(RPT) .At the RPT the effect of variation of at. wt .% of Sn and Ge on cohesive energy, heat of atomization and mean bond energy and glass transition have been studied. The mean bond energy <E> and the glass transition temperature (Tg) are calculated by using the Tichy-Ticha approach. It has been found that cohesive energy (calculated using a chemical-bond approach), heat of atomization , mean bond energy and glass transition temperature decrease with increase in at.wt.% of the Sn (or with decrease in at.wt.% of Ge ),this is due to increase in the concentration of the weaker Sn-Se and Pb-Se bonds as compare to stronger Ge-Se bonds..

Keywords

Quaternary chalcogenide glasses, Rigidity percolation threshold, Cohesive energy, Mean bond energy, Glass transition temperature.

Submitted at: Jan. 6, 2011
Accepted at: Feb. 17, 2011

Citation

VIVEK MODGIL, V. S. RANGRA, The Study of the theoretical parameters of Ge Sn substituted Pb based quaternary chalcogenide glasses at their rigidity percolation threshold, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 2, pp. 158-164 (2011)