Elastic, Dielectric, and Photoelastic Constants of Alkali Halide Crystals

The interionic potential model recently developed by taking account of the composite effect of short range repulsive and dispersion forces along with three body interactions is extended in the present work to calculate the (i) third and fourth order elastic constants, (ii) first and second order pressure derivatives of second order elastic constants, (iii) photoelastic constants, volume derivatives of dielectric constants, and optic mode Grüneisen parameters. The calculated values of various physical quantities are found to present close agreement with experimental data.