A simple expression for the heat of formation ΔH of transition-metal alloys is derived with-in the tight-binding approximation that has the form ΔH=f(N̄)ΔN², where N̄ and ΔN are the average and difference in number of valence d electrons, respectively. The prefactor f(N̄) is most negative for N̄ lying near the middle of the series and it becomes positive towards the edges. The theory gives good agreement with Miedema's semiempirical values of ΔH.
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D. G. Pettifor (1979) studied this question.
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