The migration of small homovalent cations in the monocrystalline material was studied by using tracer/sectioning methods. It was found that the results (table 201) could be described by the expression:
D (cm2/s) = 30.7 exp[-35.13(kcal/mol)/RT]
It was concluded that the diffusion behavior of the cations was in good agreement with the so-called displaced homovalent small-radius cation model.
Diffusion and Isotope Effects in the Diffusion of Homovalent Cations in Cesium Iodide. S.M.Klotsman, I.P.Polikarpova, G.N.Tatarinova, A.N.Timofeev: Physical Review B, 1988, 38[11], 7765-76
Table 196
Self-Diffusion of 131I in Polycrystalline CsI
Temperature (C) | Technique | D (cm2/s) |
155.7 | sectioning | 1.07 x 10-13 |
198.5 | sectioning | 7.13 x 10-13 |
209.2 | sectioning | 4.03 x 10-13 |
259.9 | sectioning | 4.22 x 10-12 |
278.5 | sectioning | 8.29 x 10-12 |
338.5 | sectioning | 4.04 x 10-11 |
405.5 | sectioning | 1.46 x 10-10 |
435.0 | sectioning | 4.16 x 10-10 |
447.4 | sectioning | 6.69 x 10-10 |
451.5 | sectioning | 8.60 x 10-10 |
471.7 | sectioning | 1.06 x 10-9 |
500.8 | sectioning | 2.06 x 10-9 |
522.9 | sectioning | 3.66 x 10-9 |
562.7 | sectioning | 1.31 x 10-8 |
155.7 | Gruzin | 1.39 x 10-13 |
198.5 | Gruzin | 7.67 x 10-13 |
continued
Table 196 (continued)
Self-Diffusion of 131I in Polycrystalline CsI
Temperature (C) | Technique | D (cm2/s) |
209.2 | Gruzin | 4.30 x 10-13 |
259.9 | Gruzin | 4.23 x 10-12 |
278.5 | Gruzin | 8.53 x 10-12 |
338.5 | Gruzin | 4.11 x 10-11 |
405.5 | Gruzin | 1.46 x 10-10 |
435.0 | Gruzin | 4.12 x 10-10 |
447.4 | Gruzin | 7.92 x 10-10 |
451.5 | Gruzin | 8.59 x 10-10 |
471.7 | Gruzin | 1.02 x 10-9 |
500.8 | Gruzin | 2.27 x 10-9 |
522.9 | Gruzin | 3.78 x 10-9 |
562.7 | Gruzin | 1.24 x 10-8 |