The serial sectioning technique was used to study the diffusion of Na in pure NaCl. The data, for 590 to 690C, could be described by:

D (cm2/s) = 3.2 x 100 exp[-1.78(eV)/kT]

A comparison with ionic conductivity data revealed an excess diffusion of 10 to 20%. This was tentatively attributed to the effect of vacancy pairs.

H.L.Downing, R.J.Friauf: Journal of the Physics and Chemistry of Solids, 1970, 31[4], 845-7

The best linear fits to the solute diffusion data ([382] to [383], [391] to [397], [403] to [405]) yield:

Cs: Ln[Do] = 0.29E – 9.9 (R2 = 0.73); Na: Ln[Do] = 0.57E – 22.4 (R2 = 0.99);

Sr: Ln[Do] = 0.55E – 20.5 (R2 = 0.51)