The migration of small homovalent cations in the monocrystalline material was studied by using tracer/sectioning methods. It was found that the results (table 252) could be described by the expression:

D (cm2/s) = 47 exp[-35.30(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.

S.M.Klotsman, I.P.Polikarpova, G.N.Tatarinova, A.N.Timofeev: Physical Review B, 1988, 38[11], 7765-76

 

 

Table 252

Diffusivity of 42K in CsI

 

Temperature (K)

D (cm2/s)

400.1

1.686 x 10-10

420.3

3.946 x 10-10

424.1

4.640 x 10-10

447.0

1.061 x 10-9

494.2

4.533 x 10-9

531.3

1.129 x 10-8

587.6

5.295 x 10-8

590.7

5.405 x 10-8

594.2

5.960 x 10-8

611.2

9.950 x 10-8

616.8

1.148 x 10-7