Abstract
A mechanical model of diatomic lattice which takes into account force and moment interactions is proposed. Relations between macroscale elastic moduli and microscale longitudinal and transverse stiffnesses of interatomic bonds are derived. In the framework of the proposed model, crystals with diamond and sphalerite lattices are considered. It is shown that the model offers much universality allowing quite accurate description of elastic properties of a wide range of covalent crystals.
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