The Gorsky relaxation due to H was studied in disordered and ordered samples, and the H diffusivity was determined at temperatures ranging from 273 to 533K. It was found that the diffusivity in disordered material (2.2at%H) could be described by:

D (cm2/s) = 0.0051 exp[-0.38(eV)/kT]

while that in long-period superlattice material (6.3at%H) could be described by:

D (cm2/s) = 0.0047 exp[-0.46(eV)/kT]

and by:

D (cm2/s) = 0.86 exp[-0.78(eV)/kT]

in ordered material (L12 1.4at%H).

The Diffusion of Hydrogen in Disordered and Ordered Pd3Mn as Studied Using the Gorsky Relaxation. B.Sobha, B.Coluzzi, C.Costa, F.M.Mazzolai, T.B.Flanagan, Y.Sakamoto: Journal of the Less-Common Metals, 1991, 172-174, 262-70

Table 150

Parameters for D and H Permeation in Pd-Ni