A study was made of the permeation of H through 2N7- to 4N-purity Pd and alloys which contained 15%Ag and 5%Pt, 15%Ag and 5%Co, or 5%Nb. The results for pure Pd, at temperatures ranging from 350 to 750C, could be described by:

D (cm2/s) = 5.25 x 10-3 exp[-6.22(kcal/g-atom)/RT]

The presence of 5%Nb was shown to decrease noticeably the H permeability.

G.E.Kagan, V.A.Goltsov, V.J.Aks: Trudy Ural. Politekhn. Inst., 1970, 186, 123-8