A relaxation method was used to investigate intrinsic H diffusivity in ß-phase hydrides at temperatures of 15 to 45C and H pressures of 40 to 450bar (or to 23000bar at 25C). The diffusion parameters (table 128), as deduced from the temperature dependence of the intrinsic diffusion coefficient at various pressures exhibited, a maximum at between 300 and 400bar; thus indicating that the diffusion process could no longer be described by a single-jump mechanism between adjacent octahedral interstitials in the Pd lattice.

M.Kuballa, B.Baranowski: Berichte der Bunsengesellschaft für Physikalische Chemie, 1974, 78[4], 335-8

Table 128

Parameters for H Diffusion in ß-Pd as a Function of Pressure