The alloys, Ti0.33V0.67HxDy (x+y ~ 0.9), were studied by means of X-ray powder diffraction, differential scanning calorimetry and 1H and 2H nuclear magnetic resonance. The crystal structures were predominantly body-centered cubic, but mixed with a face-centered cubic phase. A phase transition, similar to that from the δD phase to the αD phase in the V–D system, was observed in all of the samples; except the protide. The H and D were assumed to occupy tetrahedral sites. The temperature and frequency dependences of the spin-lattice relaxation times of 1H and 2H were analyzed by using the Bloembergen–Purcell–Pound equations, with a distribution of correlation times. It was found that the mean activation energy for D diffusion was higher than that for H diffusion. That is, EH was constant while ED increased slightly with the [D]/[H] ratio. The distribution of the correlation times increased as the [D]/[H] ratio decreased.

Diffusion of Hydrogen Isotopes and their Mutual Perturbation in Ti0.33V0.67HxDy (x+y ≈ 0.9) Studied by 1H and 2H NMR. S.Hayashi: Journal of Solid State Chemistry, 2003, 170[1], 82-93