The nuclear spin-lattice relaxation times of H and D in disordered body-centered cubic VyTa1-yHx, where y ranged from 0.25 to 0.85 and x ranged from 0.07 to 0.4, were measured at temperatures ranging from 11 to 430K. The diffusion parameters were determined by analyzing the relaxation data using a model that assumed a Gaussian distribution of activation energies. It was found that the dependence of the average diffusion activation energy upon the H concentration was different for different ranges of y. A comparison of the diffusion parameters of H and D in hydrided and deuterided samples revealed a distinct isotope effect with respect to the activation energy for diffusion.

Diffusion of Hydrogen in Disordered BCC VyTa1-y H(D) Alloys: a NMR Study. D.S.Sibirtsev, A.V.Skripov, J.G.Cherepanov: Physics of Metals and Metallography, 1998, 86[2], 166-72