The residual activity method was used to study 18F self-diffusion in single crystals. The data, for 730 to 830C, could be described by:

D (cm2/s) = 3.98 x 104 exp[-3.0(eV)/kT]

The data, for 580 to 730C, could be described by:

D (cm2/s) = 6.31 exp[-3.0(eV)/kT]

Fluorine Self Diffusion in LiF and NaF. H.J.Matzke: Journal of Physics and Chemistry of Solids, 1971, 32[2], 437-41