The migration of small homovalent cations in the monocrystalline material was studied by using tracer/sectioning methods. It was found that the results (table 256) 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.

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

 

 

Table 256

Diffusivity of 86Rb in CsI

 

Tracer

Temperature (K)

D (cm2/s)

42K

400.1

1.686 x 10-10

42K

420.3

3.946 x 10-10

42K

424.1

4.640 x 10-10

42K

447.0

1.061 x 10-9

42K

494.2

4.533 x 10-9

42K

531.3

1.129 x 10-8

42K

587.6

5.295 x 10-8

42K

590.7

5.405 x 10-8

42K

594.2

5.960 x 10-8

42K

611.2

9.950 x 10-8

42K

616.8

1.148 x 10-7

22Na

400.1

3.613 x 10-10

22Na

420.3

7.923 x 10-10

22Na

424.1

9.436 x 10-10

22Na

447.0

2.095 x 10-9

22Na

494.2

8.777 x 10-9

22Na

531.3

2.140 x 10-8

22Na

594.2

1.163 x 10-7

22Na

611.2

1.928 x 10-7

22Na

616.8

2.266 x 10-7