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The heat capacity of zinc ferrite (ZnFe,O,) has been determined over the range 5 to 350°K. Molal values of C~,S', and HO-H,O computed from the thermal data are 32,99&t-0.03 cal/deg., 36.01 f0.03 cal/deg., and 18,00&0.02 Cal, respectively, at 298,lS"K. A co-operative thermal anomaly associated with antiferromagnetic ordering occurs at 9.5" and extends toward higher temperatures probably as a consequence of persisting short range order.

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