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Pressure induced phase transition in Ba1-xSrxTe mixed crystal

PURVEE BHARDWAJ1,* , SADHNA SINGH1, N. K. GAUR1

Affiliation

  1. Department of Physics Barkatullah University Bhopal 462026

Abstract

We have investigated the phase transition pressures and associated volume collapses in the alkaline earth mixed compound Ba1-xSrxTe (0 ≤ x≤ 1) using a three body potential (TBP) approach and Gibbs free energy. The Gibbs free energy is expressed as a function of charge transfer (or three body interactions) and the pressure. Phase transition pressure and associated volume collapses [ΔV (Pt)/V(0)] calculated from this approach are in good agreement with experiment for the end point members (x=0 and x=1). The results for the mixed crystal counter parts are also in fair agreement with experimental data generated from the application of Vegards law to data for the end point members..

Keywords

Rare earth alloys and compounds, Semiconductors, Crystal structure, Phase transitions, High-pressure.

Submitted at: Jan. 16, 2008
Accepted at: March 17, 2008

Citation

PURVEE BHARDWAJ, SADHNA SINGH, N. K. GAUR, Pressure induced phase transition in Ba1-xSrxTe mixed crystal, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 3, pp. 564-568 (2008)