Abstract:The interionic potential model recently developed by taking account of the composite effect of short rmge repulsive and dispersion forces along with three body interactions is applied to investigate the elastic behaviour of alkaline earth oxides and fluorides. Values of third-order elastic constants and pressure derivatives of second-order elastic constants are obtained for MgO, CaO, SrO, BaO, CaF,, SrFa, and BaF, crystals. The calculated values are found to present close agreement with experimental data.
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