Equilibrium hysteresis curves for vanadium hydride and vanadium deuteride have been determined for the (β + γ and the β regions. The hysteresis loop in the two-phase region is significant. There is no hysteresis in the β region. For an almost fully loaded hydride, VH1.9, the complete hysteresis loop is achieved by cooling to temperatures of approximately -85°C. A partially loaded hydride, VHL1.3 does not require as low a tem¬perature for completion of the loop. A transient hysteresis loop for V(HD)1.72 is also discussed.
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