Heat capacity of liquid equiatomic potassium–lead alloy: Anomalous temperature dependence

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Abstract
The temperature dependence of the enthalpy function for the equiatomic K0.5Pb0.5 alloy has been determined using high-temperature drop calorimetry over the temperature range 751–1124 K. Unusually large values for the heat capacity of the liquid equiatomic alloy have been derived in the vicinity of the melting point, which was determined as Tm=862±2 K; also, the temperature coefficient of the heat capacity was found to be anomalously large and negative. Such behavior is consistent with the previously reported compositional dependence of the heat capacity in liquid K–Pb alloys deduced from electromotive force measurements. At relatively high temperatures, the heat capacity drops to values typical of metallic solutions. Possible interpretations of this striking behavior include an order–disorder transition in the liquid and/or the formation of lead clusters, such as Pbm−m.

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