Electron microprobe micro-analysis was used to study the diffusion of Tl+ from thin TlCl layers, or from the vapor phase, into optical-grade single crystals. The results (table 90) for temperatures ranging from 457 to 727C could be described by:

D (cm2/s) = 1.34 x 10-3 exp[-1.30(eV)/kT]

while those for temperatures ranging from 230 to 457C could be described by:

D (cm2/s) = 5.81 x 10-11 exp[-0.24(eV)/kT]

R.J.Tiernan, B.J.Wuensch: Journal of Chemical Physics, 1971, 55[10], 4996-9

 

 

Table 90

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