Abstract
An analysis of the crystal binding of alkali and alkaline earth chalcogenides is presented within the framework of the Born model of cohesion. The contributions of the overlap repulsive interactions between nearest and next nearest neighbours are considered in the evaluation of the cohesive energies of oxides, sulphides, selenides and tellurides of alkali and alkaline earth metals. In addition, the contributions arising from the van der Waals dipole-dipole and dipole-quadrupole interactions are estimated following the method recently proposed by Boswarva. Calculated values of the cohesive energies in alkaline earth chalcogenides present a close agreement with experimental values. Electron affinities of chalcogenide ions estimated in the present study, following the Born-Haber thermochemical process, are in remarkably close agreement with experimental data.
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