Data on D permeation and T absorption and out-gassing in pure polycrystalline Ni (annealed or heavily cold-rolled), were combined with earlier measurements of the diffusivity and solubility of H isotopes to give the relationship:

D (m2/s) = (7.0 x 10-7)/√M exp[-39500/RT]

M.R.Louthan, J.A.Donovan, G.R.Caskey: Acta Metallurgica, 1975, 23[6], 745-50