Abstract
Thermal expansion and other anharmonic properties of crystals are examined ćorrelating the thermodynamical and interatomic potential approaches. A simple method is presented for calculating the thermal expansion of solids based on the expressions derived using this approach. Particular attention is given to the effects of higher order anharmonic terms in the lattice potential energy. The applicability of the derived equations is investigated and discussed for a few alkali halides employing a realistic potential form. A general accord with the predictions of theory is found when the results are compared with the available experimental data, exhibiting an essential improvement over previous calculations of similar nature.
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