Abstract
AbstractThe dependence of the elastic constants on the relative concentration of the constituents of mixed alkali halide crystals of rocksalt structure is investigated using the pseudo‐unit cell model for the mixed crystal as illustrated by Chang and Mitra and the deformable shell model for the lattice dynamics as developed by Basu and Sengupta. Expressions are derived for the three independent elastic constants C11, C12, and C44 of the mixed system in terms of the relative concentration of the constituents and certain parameters pertaining to the terminal crystals. The theory thus developed is applied with remarkable success to the case of the mixed crystal KCl–KBr for which detailed experimental data are available.
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