The migration of small homovalent cations in the monocrystalline material was studied by using tracer/sectioning methods. It was found that the results (table 198) could be described by the expression:
D (cm2/s) = 74.4 exp[-34.94(kcal/mol)/RT]
The temperature dependence of the isotope effect for 22Na and 24Na (table 199) was described by:
E = 126 exp[-13.3(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 195
Self-Diffusion of 131I in Single Crystals of CsI
Temperature (C) | Technique | D (cm2/s) |
155.7 | sectioning | 1.05 x 10-13 |
198.5 | sectioning | 4.34 x 10-13 |
209.2 | sectioning | 2.78 x 10-13 |
259.9 | sectioning | 2.88 x 10-12 |
278.5 | sectioning | 1.18 x 10-11 |
405.5 | sectioning | 1.58 x 10-10 |
435.0 | sectioning | 3.47 x 10-10 |
447.4 | sectioning | 5.59 x 10-10 |
451.5 | sectioning | 7.73 x 10-10 |
471.7 | sectioning | 1.10 x 10-9 |
continued
Table 195 (continued)
Self-Diffusion of 131I in Single Crystals of CsI
Temperature (C) | Technique | D (cm2/s) |
522.9 | sectioning | 3.50 x 10-9 |
562.7 | sectioning | 1.10 x 10-8 |
155.7 | Gruzin | 1.36 x 10-13 |
198.5 | Gruzin | 4.92 x 10-13 |
209.2 | Gruzin | 2.91 x 10-13 |
259.9 | Gruzin | 2.98 x 10-12 |
278.5 | Gruzin | 1.15 x 10-11 |
405.5 | Gruzin | 1.64 x 10-10 |
435.0 | Gruzin | 3.66 x 10-10 |
447.4 | Gruzin | 5.61 x 10-10 |
451.5 | Gruzin | 7.13 x 10-10 |
471.7 | Gruzin | 1.01 x 10-9 |
522.9 | Gruzin | 3.60 x 10-9 |
562.7 | Gruzin | 8.77 x 10-8 |