Abstract
The vapor pressure of iron over vanadium-iron alloys was measured by the torsion-effusion method in the temperature range from 1500 to 1700 deg K. The chemical activities, as weil as the free energies, entropies, and enthalpies of formation, of the alloys were computed from the vapor pressure data. The activities of iron exhibited large negative deviations from Raoult's law throughout the entire compositional range. Although the activities of vanadium, as determined by the Gibbs-Duhem relation, deviated negatively from ideal behavior in the iron-rich alloys, nearly ideal behavior was observed in the vanadium-rich alloys. Large positive excess entropies and enthalpies of formation were found at 1600 deg K. An attempt was made to interpret these quantities in terms of the various configurational, vibrational, and magnetic changes that occur in this system on alloying. (auth)
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