An investigation was made of the self-diffusion of 134Cs in monocrystalline and polycrystalline material; using both the sectioning and Gruzin methods. The data (tables 193 and 194) indicated that intercrystalline diffusion did not contribute significantly to the diffusion process. The overall results for monocrystalline and polycrystalline material at 294 to 500C were described by:

D (cm2/s) = 85 exp[-37.94(kcal/mol)/RT]

according to the sectioning method, and by:

D (cm2/s) = 75 exp[-37.79(kcal/mol)/RT]

according to the Gruzin method. The combined results for single crystals could be described by:

D (cm2/s) = 80 exp[-37.86(kcal/mol)/RT]

while the combined results for polycrystals could be described by:

D (cm2/s) = 42 exp[-36.89(kcal/mol)/RT]

The polycrystals were prepared via deformation and recrystallization of monocrystals.

Cesium-134 and Iodine-131 Self-Diffusion in Cesium Iodide Single and Polycrystals. S.M.Klotsman, I.P.Polikarpova, A.N.Timofeev, I.S.Trakhtenberg: Fizika Tverdogo Tela, 1967, 9[9], 2487-502