Electrolytic techniques were used to measure the temperature dependence of the diffusivity of H, in Pd-Er solid solutions which contained up to 8at%Er, at temperatures which ranged from 270 to 340K. It was found that the data for each binary alloy obeyed the Arrhenius relationship (table 133). However, the apparent activation energies exhibited a non-linear dependence upon Er content. The activation energies exhibited an initial increase with Er content, and then decreased after reaching a maximum at about 5at%Er. This behavior was explained in terms of classical jump theory.

M.L.Wasz, R.B.McLellan: Acta Metallurgica et Materialia, 1993, 41[7], 1971-7

Table 133

Diffusivity Parameters for Hydrogen in Pd-Er Alloys