Alloys of zinc chalcogenides exhibit both some of the smallest (for ZnSₓSe_1-x) and the largest (for ZnSₓTe_1-x) optical bowing observed in isovalent semiconductor systems. A theoretical analysis of this effect, by use of self-consistent band-structure techniques for ordered 50%-50% alloys in the CuAu-I structure, predicts correct bowing parameters and chemical trends, yet suggests a physical model which is altogether different from the virtual-crystal model.
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Bernard et al. (1986) studied this question.
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