Self-diffusion coefficients in glass-forming LiCl•7H2O were measured by means of nuclear magnetic resonance spin-echo techniques, using static magnetic field gradients of up to 184T/m. These measurements were combined with data on 7Li and 1H spin-lattice relaxation times. The results covered temperatures ranging from 313K to 173K. The latter temperature was 34K above the glass transition. Within this range, the Li and H diffusivities varied by 5 orders of magnitude. The self-diffusion data exhibited a strong non-Arrhenius temperature dependence. In the supercooled region, the H/Li self-diffusion ratio increased gradually with decreasing temperature; thus indicating a de-coupling of their diffusion. It was found that Li ion diffusion was closely coupled to other transport processes, while H diffusion began to de-couple at temperatures that were less than 208K.

T.Feiweier, O.Isfort, B.Geil, F.Fujara, H.Weingartner: Journal of Chemical Physics, 1996, 105[14], 5737-44