Solubility and Diffusivity of Hydrogen in Vanadium and its Alloys around Room Temperature

The solid solubility in equilibrium with hydride and the diffusion coefficient of hydrogen around room temperature are determined in pure vanadium and its alloys. Both determinations are made with the resistivity measurement. The solid solubility is increased by the addition of Ti and Zr, slightly increased by Mo, not affected by Nb, Cr or Fe and slightly decreased by Cu. The diffusion coefficient is decreased by Ti and Zr, while other elements investigated have no effect. The effects of Ti and Zr may be due to binding between hydrogen atoms and the solvent atoms in dilute solutions. The H–Ti binding energy is estimated to be about 0.15 eV . The origin of the H–Ti and H–Zr binding is likely to be electronic.