The principle of conservation and transferability of chemical bonds explains the recent discovery by extended x-ray-absorption fine-structure measurements of two unequal anion-cation bond lengths RAC and RBC in AₓB_1-xC zinc-blende semiconductor alloys despite the close adherence of the lattice constant to the average value (V\'egard rule). This bond alternation, manifested as a structural distortion to a local chalcopyrite coordination around the anions, explains also most of the observed optical bowing in semiconductor alloys.
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Zunger et al. (1983) studied this question.
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