Anomalous S-shaped deviations from Vegard's law in some semiconductor alloys are attributed to the effect of bond-bending forces. This idea is substantiated by numerical calculations on two-dimensional model alloys. A criterion is found which separates the occurrence of usually observed concave bowing and S-shaped deviations. In addition, our results show that the distribution of bond lengths in an alloy is bimodal.
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Fong et al. (1976) studied this question.
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