Thin-layer deposition and sectioning techniques were used to investigate the isotope effect for the self-diffusion of 131Cs and 137Cs at 470 to 600C. The isotope effect was found to be independent of temperature (table 192). This indicated that the contribution of divacancies to self-diffusion was small, and that the predominant mechanism of self-diffusion involved free monovacancies.
Isotope Effect in Self-Diffusion of Cs in Single Crystals of CsI. S.M.Klotsman, I.P.Polikarpova, G.N.Tatarinova, A.N.Timofeev: Physica Status Solidi B, 1974, 63[1], 153-62
Table 193
Self-Diffusion of 134Cs in Single Crystals of CsI
Temperature (C) | Technique | D (cm2/s) |
242.8 | sectioning | 5.88 x 10-14 |
293.7 | sectioning | 1.97 x 10-13 |
332.3 | sectioning | 2.05 x 10-12 |
350.5 | sectioning | 3.88 x 10-12 |
375.3 | sectioning | 1.28 x 10-11 |
381.3 | sectioning | 1.70 x 10-11 |
405.0 | sectioning | 4.91 x 10-11 |
427.6 | sectioning | 1.41 x 10-10 |
451.0 | sectioning | 3.49 x 10-10 |
481.0 | sectioning | 9.73 x 10-10 |
499.0 | sectioning | 1.40 x 10-9 |
242.8 | Gruzin | 5.27 x 10-14 |
293.7 | Gruzin | 2.13 x 10-13 |
332.3 | Gruzin | 1.97 x 10-12 |
350.5 | Gruzin | 3.33 x 10-12 |
375.3 | Gruzin | 1.29 x 10-11 |
381.3 | Gruzin | 1.71 x 10-11 |
405.0 | Gruzin | 4.88 x 10-11 |
427.6 | Gruzin | 1.34 x 10-10 |
451.0 | Gruzin | 3.64 x 10-10 |
481.0 | Gruzin | 8.08 x 10-10 |
499.0 | Gruzin | 1.42 x 10-9 |