A microscopic calculation is carried out for thermal properties of ionic crystals on the basis of the thermodynamic variational principle. Self-consistent Einstein approximation is used to obtain effective force constants between constituent ions. Thermal expansion, temperature dependencies of the elastic constants and dielectric constants of ionic crystals are evaluated in terms of interatomic potentials. The results of numerical calculations for alkali halide crystals are in good agreement with experimental data.
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Nambu et al. (1990) studied this question.
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