The residual activity method was used to study 18F self-diffusion in single crystals. The data, for 630 to 940C, could be described by:
D (cm2/s) = 3.98 x 104 exp[-3.1(eV)/kT]
Fluorine Self Diffusion in LiF and NaF. H.J.Matzke: Journal of Physics and Chemistry of Solids, 1971, 32[2], 437-41
Table 175
Diffusivity of 22Na in 4N8-Purity NaF Single Crystals
Temperature (C) | D (cm2/s) |
970.0 | 9.32 x 10-9 |
966.0 | 7.40 x 10-9 |
962.5 | 7.36 x 10-9 |
958.0 | 6.71 x 10-9 |
952.0 | 5.03 x 10-9 |
947.0 | 4.34 x 10-9 |
937.0 | 4.20 x 10-9 |
931.0 | 3.60 x 10-9 |
919.0 | 2.59 x 10-9 |
901.0 | 1.80 x 10-9 |
894.0 | 1.26 x 10-9 |
876.0 | 9.90 x 10-10 |