The Anderson Parameter and Temperature Dependence of Bulk Modulus for Alkali Halide Crystals

Abstract

Abstract The relation is studied between the Anderson parameter δ and the temperature dependence of the bulk modulus for 16 alkali halides with NaCl structure. Two Anderson parameters δ S and δ T are considered, corresponding to the adiabatic and isothermal bulk moduli, B S and B T , respectively. It is found that the assumption δ S ≈ δ T taken by several previous workers is not correct. The difference between δ S and δ T arises largely due to difference between the temperature derivatives of B S and B T at fixed volume. An analysis of the volume dependence of the bulk modulus is performed in terms of interionic potentials. Values of δ S and δ T are calculated using seven different potential forms for the short‐range repulsive energy.