The rate of isotopic exchange of chloride ions, between hydrous ceria and aqueous solutions, was studied by using radiometric techniques. The self-diffusion of Cl- was measured in hydrous material which had been dried at temperatures of 50, 200 or 400C. It was found that the mobility of Cl- increased with increasing drying temperature (table 31).

I.M.El-Naggar, E.I.Shabana, M.A.El-Absy: Solid State Ionics, 1991, 48[1-2], 79-83

Table 31

Self-Diffusion of Cl- in Hydrous CeO2