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

D (cm2/s) = 19 exp[-35.59(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 192

Diffusivity of 131Cs and 137Cs in CsI Single Crystals

 

Temperature (C)

D (cm2/s)

E

604

3.14 x 10-8

0.507

599

2.72 x 10-8

0.523

588

1.91 x 10-8

0.560

534

4.40 x 10-9

0.532

503

1.65 x 10-9

0.532

499

1.79 x 10-9

0.554

471

5.96 x 10-10

0.551