Analytic expressions for the shear constants of sp-valent zincblende and f.c.c. structure types are obtained using a first-nearest-neighbour bond order potential. Novel expressions for the tetragonal and trigonal zincblende shear constant C' and C 44 are derived. ImportantlyC' is found to vary as the cube of the bond order. The angular character of the bond order potential is shown to remove the anisotropy constraint of C 44/C' = 2 for f.c.c. lattices within a nearest-neighbour model.
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Alinaghian et al. (1994) studied this question.
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