The migration of the small homovalent cation in monocrystalline material was studied by using 137Cs tracer/sectioning methods. It was found that the results could be described by:

D (cm2/s) = 1.90 x 101 exp[-35.6(kcal/mol)/RT]

S.M.Klotsman, I.P.Polikarpova, G.N.Tatarinova, A.N.Timofeev: Physical Review B, 1988, 38[11], 7765-76

The best linear fits to the solute diffusion data ([407] to [411], [418] to [422]) yield:

Cs: Ln[Do] = 0.60E – 18.3 (R2 = 0.995); Xe: Ln[Do] = 0.32E – 7.8 (R2 = 0.70)