Measurements were made of the diffusivity of D in single crystals of Ni at 490 to 690K. The results were expressed in terms of an isotope effect (table 98).

Isotope Effects in the Diffusion and Solubility of Hydrogen in Nickel. Y.Ebisuzaki, W.J.Kass, M.O'Keeffe: Journal of Chemical Physics, 1967, 46[4], 1373-7

Table 99

Isotope Effect for H and D Diffusion in Ni