High pressure phase transition in samarium monochalcogenides SmX (X=S, Se, Te) and their alloy SmS1−xSex

Theoretical Analysis of Semiconducting Sm1-xEuxS under Pressure

“…The values of P t at different compositions have been obtained from the linear interpolation between the transition pressures of the two end crystals. A similar variation is obtained in our earlier work [7].…”

“…For the study structural and elastic behavior of this alloy we have calculated the model parameters. The method for calculations of transition pressure and second order elastic constants are same which we have reported in our earlier work [7]. To know the relation of transition pressure with composition, we have plotted the variation of transition pressures with composition (x) in Figure 1 and S) and 21.1(EuS) GPa respectively.…”

“…The first term in the above equation represents the lattice energies for B1 and B2 structure. These energies contain only three model parameter whose values have been determined from the knowledge of the first and second order derivatives of lattice energy which have been reported in our earlier work [7].…”

“…The method of evaluation of three model parameters of endpoint members is the same as given in [7]. The values of these model parameters for their mixed crystal components have been determined from the application of Vegards law to the corresponding measured data for AC (SmS) and BC (EuS).…”

“…We are motivated by the above-mentioned technological application and understanding physical properties on the effect of substitution of Eu for Sm in SmS as well as the effect of concentration and pressure on this compound and its alloy part is less studied. In the present study, we applied an improved interaction potential [7] model (which includes polarizability effect) for the prediction of phase-transition pressures, associated volume collapses and elastic module of Sm based alloy. These properties have been calculated by using Vegard's law.…”