The diffusivity was measured (table 144), at temperatures of between 270 and 350K, by using electrolytic methods. An analysis of the results indicated that the substitutional solute atoms created trapping sites for H atoms. These were quite shallow (0 to 4kJ/mol), as compared with those created by the cold deformation of pure Pd (20 to 40kJ/mol). It was found that noble metals created the shallowest trapping sites, while group-V metals created the deepest ones.

M.Yoshihara, R.B.McLellan: Acta Metallurgica, 1982, 30[8], 1605-11

Table 144

Parameters for H Diffusion in Pd-Based Alloys