High-Temperature Heat Contents and Related Thermodynamic Functions of Eight Rare-Earth Metals: Sc, Gd, Tb, Dy, Ho, Er, Tm, and Lu

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Abstract
The high‐temperature heat contents of scandium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, and lutetium were measured from 0°C to at least the melting points of these metals. The specific heats, heats of transition, heats of fusion, and related thermodynamic functions were calculated. The smoothed values of H°T—H°298.15, (H°T—H°298.15)/T, S°T, and − (F°T—H°298.15)/T are tabulated at 100° intervals. An examination of the entropies of transition and fusion of all of the measured rare‐earth metals shows that the entropy of the fcc(or hcp)⇄bcc transition depends upon the number of valence electrons and the entropy of fusion decreases with increasing rare‐earth‐metal size. The electronic dependence of the entropy of transformation has also been observed to hold for other metals undergoing similar transformations.