Abstract
The high-temperature entropy at constant pressure, obtained from heat capacity data, is analyzed for Mo, Nb, Pd, Rh, Ru, Sc, Ti, V, W, Y, and Zr. The vibrational contribution to the entropy defines an entropy Debye temperature, θ S(T). Due to anharmonicity, θ S(T) decreases with the temperature T, typically by 10–20% between room temperature and the melting point. An unusual temperature dependence of θ S(T) may indicate inadequacies in the underlying data. On this ground, the C p data recommended by Hultgren et al. (1973) for W and Ru seem doubtful. A comparison is made between θ S and the elastic-limit Debye temperature θ D for the metals with a cubic lattice structure. θ S of Nb is found to be almost independent of T, a feature related to the fact that the elastic constant c 44 increases with T.
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