The residual activity method was used to study 18F self-diffusion in single crystals. The data, for temperatures ranging from 630 to 940C, could be described by:

D (cm2/s) = 3.98 x 104 exp[-3.1(eV)/kT]

H.J.Matzke: Journal of the Physics and Chemistry of Solids, 1971, 32[2], 437-41