It is shown that the anomalous elastic behaviour of Invar alloys is due to the contribution f the exchange energy. Using a molecular field approximation the exchange contributions is given in terms of the first and second derivatives of the effectives fo the effective exchange integral J(r). These parameters are correlated with the Bethep-Slater curve. Quantitative results are given for Invar (Fe-35% Ni), Fe30% Ni, and Ni.
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G. Hausch (1973) studied this question.