In the present paper, a theory for the solubility of hydrogen in vanadium in equilibrium with the gas phase is worked out mainly for the β phase, including the region of hyperstoichiometric concentration. Also, permeability of hydrogen in a bulk specimen of vanadium through the β phase built into the subsurface layers of the specimen facing the gas phase is theoretically formulated. The results of the numerical evaluation of the solubility and permeability are satisfactorily compared with absorption and permeation experiments. The complementariness of these two experiments is to be noted, as discussed in the present theory. © 1993.
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