The self-diffusion of Li+ was investigated in single crystals by monitoring the interdiffusion of specimens having different isotopic concentrations (3.36 and 90.56%6Li). It was shown that the Li self-diffusion (table 195) was related to the number of vacancies in the crystals. The results, for temperatures of 650 to 800C, could be described by:
D (cm2/s) = 9 exp[-1.90(eV)/kT]
The values for temperatures below 650C were strongly affected by the presence of impurities.
A.N.Naumov, V.B.Ptashnik: Fizika Tverdogo Tela, 1968, 10[12], 3710-2
Table 195
Self-Diffusion of Li in LiF Single Crystals
Temperature (C) | D (cm2/s) |
550 | 8.00 x 10-11 |
600 | 1.49 x 10-10 |
650 | 3.88 x 10-10 |
700 | 1.33 x 10-9 |
750 | 3.55 x 10-9 |
800 | 1.15 x 10-8 |