Abstract
The thermodynamic properties of dilute solutions of hydrogen and deuterium in manganese have been studied between 555 and 700 K. If the harmonic-oscillator model is assumed, we calculate from the isotope effect at 555 K a vibrational wavenumber of hydrogen of 980 cm −1. The corresponding vibrational entropy of hydrogen is quite large compared with the observed values. This indicates that the number of interstitial sites accessible to hydrogen is significantly smaller (about 1 2 ) than the number of manganese atoms.
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