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Application of a first-principles local-density total-energy minimization method to both ordered and random models of a III-V semiconductor alloy shows a bimodal distribution of anion-cation bond lengths despite a close adherence to Vegard's rule and predicts ordered intermediate phases to be the thermodynamically stable low-temperature ground state, whereas the disordered phase is shown to be metastable.
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Srivastava et al. (1985) studied this question.
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