Constitution and Magnetic Susceptibilities of Vanadium-Hydrogen Alloys

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Abstract
A series of vanadium‐hydrogen alloys ranging in composition from 0 to 42 at.% has been examined using powder diffraction techniques. At room temperature the following was found: (1) terminal solubility (bcc phase) to about 2 at.% H, (2) a body‐centered tetragonal phase with an axial ratio of about 1.10 in the vicinity of V2H, and (3) a two‐phase region extending from about 2 to 30 at.% H. Experiments at elevated temperatures showed that the two‐phase region vanished in the vicinity of 150°C. The axial ratio of a β‐phase alloy showed a strong dependence on temperature, falling from 1.1 at room temperature to unity at 205°C. Susceptibility measurements revealed (1) a temperature independent susceptibility for the hydrogenated material and (2) a fall in susceptibility with increasing H content. The results are consistent with the notion that (1) H in V ionizes with its electron joining the delocalized electrons in the metal and (2) the interstitial hydrogen tends to order at high concentrations and/or low temperatures.