By using quasi-elastic neutron scattering, it was shown that the diffusion mechanism in Pd85Si15H7.5 was characterized by 2 well-separated regimes of jump-rate. The effective H diffusivity at 303K was equal to 1.3 x 10-6cm2/s, while that at 373K was equal to 2.7 x 10-6 cm2/s.

Hydrogen-Diffusion Mechanism in Amorphous Pd85Si15H7.5: a Neutron-Scattering Study. D.Richter, G.Driesen, R.Hempelmann, I.S.Anderson: Physical Review Letters, 1986, 57[6], 731-4