It was recalled that the diffusivity of H isotopes in Pd and its alloys had been deduced from the rate of increase in electrical resistivity during H or D ordering at about 50K. The interstitially dissolved H interacted with lattice defects that contained the impurity atoms because of the volume dilatation and change in electronic configuration that were caused by the introduced H. The migration energies of H isotopes in the alloys increased, above those in pure Pd, with increasing alloying additions at low temperatures. The energy of H in cold-forged Pd was also expected to be affected by the trapping of H around dislocations. The diffusivity and migration energy of H in cold-worked Pd were determined here by measuring the increase in electrical resistivity due to H ordering at about 50K. It was found that the migration energy for H in cold-worked Pd was almost the same as that for annealed Pd. These values were 0.101 and 0.102eV, respectively.

Hydrogen Migration in Cold Worked Pd around 50K. K.Yamakawa, H.Maeta: Scripta Metallurgica et Materialia, 1995, 32[7], 967-70