An investigation was made of the isotopic exchange reaction, between RbCl and Cl, by using 36Cl as tracer. It was found that the data, for temperatures ranging from 200 to 400C, could be described by:

D (cm2/s) = 3.37 x 10-5 exp[-31(kcal/mol)/RT]

Self-Diffusion of Chloride Ions in Rubidium Chloride and Exchange Reaction Between Chlorine Gas and the Crystallites. T.Takaishi, Y.Sensui: Transactions of the Faraday Society, 1969, 65, 131-8