The diffusion of H in the α' phase of alloys which contained up to 17%Ag was studied by using proton magnetic resonance techniques. Proton spin-lattice relaxation times were measured at 200 to 400K, and the diffusion coefficient was also measured directly by using the pulsed field gradient method at 300 to 400K. The combined sets of measurements were consistent with the occurrence of random jumps between nearest-neighbor octahedral sites, and were inconsistent with jumps between tetrahedral sites. For a given H concentration, the diffusivity decreased, the pre-exponential increased by a factor of about 2, and the activation energy increased from 0.23 to 0.28eV upon adding 17at%Ag.

Nuclear Magnetic Resonance Study of Hydrogen Diffusion in Palladium-Silver Alloys. P.P.Davis, E.F.W.Seymour, D.Zamir, W.D.Williams, R.M.Cotts: Journal of the Less-Common Metals, 1976, 49, 159-68