Abstract
The second-order elastic constants (SOEC), third-order elastic constants (TOEC), and fourth-order elastic constants (FOEC) of mixed alkali-halide crystals are calculated using a phenomenological potential model which takes into account the effect of Lundqvist's three-body forces along with other relevant interactions in ionic solids. Values of three SOEC, six TOEC, eleven FOEC, and pressure derivatives of SOEC have been calculated for NaCl-NaBr, KCl-KBr, and KBr-KI mixed crystals for the entire range of compositions. The results are compared with available experimental values. The applicability of knowledge of TOEC and FOEC has been discussed for predicting the conductivity and thermal expansion coefficient of mixed crystals.
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