The crystal ionicity of the zincblende and rocksalt compounds as a function of the valence band gap

By using the Coulson et al (1962) valence bond theory, an expression is obtained for the ionicity of the zincblende compounds in terms of the lower valence band gap at the X point of the Brillouin zone (X1-X3). The extension of the theory to the rocksalt structure is discussed.

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