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.
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