The migration of H in Pd–1at%Fe and Pd–1at%Ag alloys was investigated by electrical resistivity measurement around 50K. The disordered H atoms were introduced by electron irradiation with 0.5MeV electrons below 15K. The disordered atoms order by migration of H atoms during the heating-up of the specimens. The recovery curves of electrical resistivity have two sub-stages for electron irradiated specimens and one stage for fast cooled specimens. The migration energy of H was obtained from the kinetic analysis of the resistivity change due to the ordering, using the cross-cut method for the electron irradiated specimen and fast cooled specimen. The obtained value of the migration energy for the low temperature stage was smaller than that for the high temperature stage. The value for the high temperature stage was similar to the energy for the case of fast cooling. The difference between the H atoms disordered by irradiation and that by fast cooling was discussed for Pd based alloys.

Hydrogen Migration in Electron Irradiated Pd Based Dilute Alloys around the 50K Anomaly. K.Yamakawa, Y.Chimi, N.Ishikawa, A.Iwase: Journal of Alloys and Compounds, 2004, 370[1-2], 211-6