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We have calculated the formation enthalpy of two Ga₁₆{Al}₁₆As₃₂ alloys where the Ga and Al are randomly distributed on one of the fcc sublattices in a 2a×{}2a×{}2a cubic unit cell. In disagreement with our average t-matrix calculation, which found a negative enthalpy for the random alloy, but in agreement with the atomistic calculation of Wei and Zunger, we find that the random alloy has a formation enthalpy somewhat less positive than the (GaAs)₁(AlAs)₁(001) superlattice.
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Lee et al. (1989) studied this question.
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