The capillary reservoir technique was used to study the self-diffusion of 42K in LiBr-KBr melts (table 22). The activation energy for the tracer diffusion of 42K in eutectic mixtures, at temperatures ranging from 360 to 760C, was equal to 6.0kcal/mol.
M.Chemla, P.Lantelme, O.P.Mehta: Journal de Chimie Physique et de Physicochimie Biologique, 1969, October, 136-43
Table 22
Tracer Diffusion of 42K in KBr-LiBr Melts
LiBr (%) | Temperature (C) | D (cm2/s) |
4 | 750 | 6.31 x 10-5 |
24.5 | 659 | 4.90 x 10-5 |
24.5 | 759 | 6.30 x 10-5 |
36 | 557 | 3.91 x 10-5 |
51.5 | 360 | 1.16 x 10-5 |
51.5 | 363 | 9.80 x 10-6 |
51.5 | 401 | 1.82 x 10-5 |
51.5 | 456 | 2.17 x 10-5 |
51.5 | 507 | 3.07 x 10-5 |
51.5 | 548 | 3.12 x 10-5 |
51.5 | 554 | 3.31 x 10-5 |
51.5 | 642 | 4.91 x 10-5 |
51.5 | 655 | 5.37 x 10-5 |
51.5 | 761 | 6.76 x 10-5 |
76 | 496 | 3.38 x 10-5 |
76 | 535 | 2.92 x 10-5 |
76 | 643 | 4.33 x 10-5 |
76 | 747 | 8.44 x 10-5 |
99 | 566 | 4.93 x 10-5 |
99 | 571 | 5.07 x 10-5 |
99 | 669 | 6.80 x 10-5 |
99 | 750 | 8.50 x 10-5 |