Proton spin-lattice relaxation measurements were carried out on β-phase hydrides at temperatures ranging from 100 to 300K and resonance frequencies of 7, 11 and 47MHz. The measurements for PdH0.7 indicated an activation energy for diffusion of 0.228eV, at temperatures above 195K. The interpretation of the data was considered to be uncertain at lower temperatures. The difference between the diffusion coefficients for the pure metal, and for alloys which contained 3 or 6%Ce, was less than 30%. It was concluded that the considerably higher H permeation rates which had previously been observed for these alloys were due to differences in surface processes.

Nuclear Magnetic Resonance Study of Hydrogen Diffusion in Palladium and Palladium-Cerium Alloys. D.A.Cornell, E.F.W.Seymour: Journal of the Less-Common Metals, 1975, 39[1], 43-54