The diffusivity was measured by applying electrochemical techniques to foils of Marz-grade material, and performing constant-current permeation or potentiostatic depletion monitoring. It was found that these values (table 102) were much higher than some previously measured ones. The reason for this was unclear. It was concluded that, at temperatures down to at least 273K, there was no trapping of H in well-annealed Ni. It was also concluded that the simple classical description of thermally activated diffusion was valid over a wide temperature range.

The Diffusivity of Hydrogen in Nickel at Low Temperatures. K.A.Lee, R.B.McLellan: Scripta Metallurgica, 1984, 18[8], 859-61