Neutron scattering was used to study H diffusion between saturated and unsaturated Y samples. The diffusivity was equal to 3.69 x 10-6cm2/s at 500C. The activation energy for diffusion was 15.37kcal/mol.

F.Frisius, H.Hackbarth, P.Wille: Atomkernenergie, 1976, 27[4], 287-8