The self-diffusion of Li in the melt could be described by:

D (cm2/s) = 1.12 x 10-2 exp[-9.31(kcal/mol)/RT]

The self-diffusivity of Li in molten LiBeF3 was lower than that in molten Li2BeF4. The activation energies were similar. The results suggested that Li ions diffused through narrow spaces between complex anions.

N.Iwamoto, Y.Tsunawaki, N.Umesaki, K.Furukawa, H.Ohno: Trans. JWRI, 1978, 7[1], 1-3