The migration of H in rapidly cooled Pd–H alloys was investigated by performing electrical resistivity measurements at around 50K. Disordered atoms of H were introduced by fast cooling from around 80 to around 20K. The disordered atoms were ordered by migration of the atoms during heating of the specimens at constant rates. The activation energy of migration of H was obtained from a kinetic analysis of the resistivity change due to ordering, using the so-called cross-cut method. The obtained value was compared with previous results, which had been obtained for H disordered by quenching into liquid He, isothermally annealing the specimen and performing resistivity measurements in liquid He. The present value was found to be in fairly good agreement with the values obtained in the quenched case.

Hydrogen Migration in Fast Cooled Pd–H Alloys around 50K. K.Yamakawa: Journal of Alloys and Compounds, 2005, 393[1-2], 70-6

Table 9

Diffusivity of O in Pd