Abstract
A statistical thermodynamic treatment of miscellaneous metal-hydrogen systems is reported. The analysis is based on the a priori assumption that the interaction energy between hydrogen atoms in metals is constant within the homogeneity range at a given temperature. The number of interstitial sites available for occupation by hydrogen atoms in the metal lattice is chosen such that this condition is fulfilled. The atomic partition functions estimated for hydrogen in metals are similar for metals belonging to the same group in the periodic table. This result is reasonable because the atomic partition function reflects both the electronic state and the vibrational mode of the atom.
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