Cohesive energy for 24 alkali, silver, and thallous halides and 15 alkaline earth chalcogenides crystallizing in NaCl and CsCl structures are calculated within the framework of compressible ion theory proposed by Narayan and Ramaseshan, splitting the short-range repulsive interaction into its ionic components. The nearest and next-nearest neighbour interactions as well as van der Waals interactions are taken into account to evaluate the cohesive energy for these diatomic ionic solids. The results obtained are found to be in close agreement with recent experimental data.Die Kohiisionsenergien fur 24 Alkali-, Silber-und Thalliumhalogenide und 15 Erdalkalichalkogenide, die in NaCl-und CsC1-Strukturen kristallisieren, werden im Rahmen der von Narayan und Ramasesban vorgeschlagenen Theorie kompressibler Ionen berechnet, wobei die kurzreichweitige abstol3ende Wechselwirkung in ihre Ionenkomponenten aufgespalten wird. Die Wechselwirkungen zwischen nachsten und ubernachsten Nachbarn sowie die van der Wads-Wechselwirkungen werden bei der Berechnung der Kohiisionsenergie fur diese diatomaren Ionenfestkorper beriicksichtigt. Die erhaltenen Ergebnisse befinden sich in guter tfbereinstimmung mit neueren experimentellen Daten.
The short range Rydberg potential which assumes an attractive term along with the frequently used repulsive term for short range interaction is employed to calculate the transverse optic mode Griineisen parameter (yTo), longitudinal optic mode Griineisen parameter (yLO), Griineisen parameter
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