Abstract
Abstract The question, why a phenomenological potential model initially developed for an ionic crystal is successfully applicable in partially covalent crystals also, is investigated. Using a specific example of three-body force model in I–VII, II–VI and III–V binary solids with ZnS structure and partial covalent character, we show that the charge parameters and force parameters of the phenomenological model correlate very well with the fractional ionic or covalent character defined in terms of the Phillips scale. The three body and inter-sublattice displacement contributions to the breakdown of the Cauchy relation between elastic constants are also calculated and reported.
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