The diffusivities in wire specimens were determined by measuring (at 4.2K) the isothermal decay of excess resistivity at temperatures ranging from 265 to 360K. The isotopes were introduced into the alloys by liquid-H quenching. It was found that the ratio of the diffusivities of H and D, as a function of temperature, exhibited essentially the same behavior for Ni and its dilute alloys.

Isotope Effect in Hydrogen Diffusion in Nickel Based Alloys. K.Yamakawa, F.E.Fujita: Scripta Metallurgica, 1988, 22[8], 1349-51