High pressure phase transition in samarium monochalcogenides SmX (X=S, Se, Te) and their alloy SmS₁₋ ₓSeₓ
2013
Dubey, Ritu | Singh, Sadhna
Phase transition pressures, relative volume changes, elastic and thermophysical properties of Samarium monochalcogenides SmX (X=S, Se, Te) have been studied. An improved interaction potential model has been developed which includes Coulomb, three-body interaction, polarizability effect and overlap repulsive interaction operative up to second neighbor ions. In addition, we have investigated the phase transition pressure and associated volume collapse in SmS₁₋ ₓSeₓ alloy (0⩽x⩽1) which shows transition from discontinuous to continuous as x is reduces. The present results are in general in good agreement with experimental data available for the end point members (x=0 and x=1). The results for the alloy counter parts are also in fair agreement with experimental data generated from the vegard’s law.
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