Abstract
An interionic-force model has been employed to analyse the anharmonic elastic properties of mixed-diatomic-crystal systems with varying compositions. The interaction system consists of long-range Coulomb and three-body interactions within the framework of Hafemeister-Zarht (HZ) short-range repulsion, effective up to second-neighbour ions. This interionic potential has been used for predicting the third-order elastic constants, the first pressure derivative of second-order elastic constants and the Anderson-Gruneisen (AG) parameter in NaCl−NaBr and AgCl−AgBr mixed crystals. The values of the hardness parameter between nearest neighbours as well as between second nearest neighbours have been evaluated by using the overlap integral method. The results obtained in the present study are generally in good agreement with the available experimental data as compared to those obtained by earlier investigations. The experimental values of the Anderson-Gruneisen parameter have been calculated by using Chang’s relation.
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