Heat Capacities of DyCo5 in Relationship to Its Magnetic Anomaly, Third Law Entropies, and Related Thermochemical Data

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Abstract
Heat capacities of DyCo5 are reported for the temperature range extending from 12° to 470°K. Evaluation of the third law entropies of the compound gives [in cal deg—1 (g formula weight)—1] 55.61±0.05 and 72.05±0.07 at 298.16° and 450°K, respectively. Excess heat capacity is observed between 275° and 400°K, seemingly due to the previously observed magnetic anomaly at 360°K. Analysis of the data suggests that there is an appreciable magnetic contribution to the heat capacity throughout the temperature range covered. The profile of the thermal anomaly at about 350°K is unusual suggesting that the alteration of magnetic structure which produces it is also unusual.