The migration of Cs+ in the hydrous oxide, at 50 and 400C, was studied. It was found that the diffusion coefficients decreased with increasing exchange capacity. This was attributed to an increase in the strength of the electrostatic interaction with exchange sites. These were usually greater at 400C, due to a change from a microporous texture to a mesoporous texture. It was noted that the self-diffusion and tracer diffusion coefficients were almost equal, and this was attributed to the presence of free water which retained alkali ions in an essentially dehydrated form.

E.I.Shabana, N.Z.Misak: Solid State Ionics, 1990, 44[1-2], 41-6