An attempt is made to predict the variation of the Néel temperature of ternary solid solutions of antiferromagnetic oxides such as pAO—qBO—rCO with (p + q + r) = 1 in terms of the Bethe‐Peierls‐Weiss model. It is shown how to apply this analysis to a binary solid solution. An expression is obtained which differs significantly from a linear interpolation. The experimental values of the Néel temperature are reported for solid solutions of the form pFeO—qCoO (p + q = 1) with p in the range from zero to 0.75. A comparison is made with the theoretical predictions.
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