A study was made of the diffusion of Tl+ along the grain boundaries of bicrystals, by using autoradiographic analysis, micro-hardness measurements and micro X-ray spectral analysis. The results for temperatures ranging from 200 to 620C could be described by an activation energy of 0.39eV.

Cation Diffusion along Boundaries in Alkali Halide Bicrystals. J.E.Geguzin: Fizika Tverdogo Tela, 1966, 8[11], 3248-53

Table 74

Diffusion of Tl+ in KCl Single Crystals

 

Temperature (C)

D (cm2/s)

233

6.26 x 10-13

250

3.8 x 10-13

250

4.56 x 10-13

297

3.1 x 10-13

306

4.0 x 10-13

315

2.60 x 10-13

350

8.05 x 10-13

386

1.40 x 10-12

393

1.05 x 10-12

438

2.55 x 10-12

450

6.5 x 10-13

498

2.78 x 10-12

512

3.0 x 10-12

532

9.2 x 10-12

550

2.40 x 10-11

559

1.65 x 10-11

600

3.45 x 10-11

604

5.05 x 10-11

624

4.85 x 10-11

654

1.17 x 10-10

688

2.50 x 10-10

688

2.25 x 10-10

727

2.9 x 10-10

727

4.0 x 10-10