Investigations were made of Li diffusion, in stage-1 and stage-2 intercalation compounds, by using neutron time-of-flight and back-scattering techniques and -radiation detected nuclear magnetic resonance/relaxation involving 8Li (half-life = 0.8s). Depending upon the temperature, the spin-lattice relaxation rate of 8Li was governed by various processes. At temperatures above 300K, the spin-lattice relaxation rate exhibited maxima that were caused by long-range Li+ diffusion. Study of the B-field dependence of the spin-lattice relaxation rate revealed a 2-dimensional diffusion behavior. The neutron spectra exhibited quasi-elastic line broadening at temperatures above 500K. This was used to deduce diffusion coefficients and to trace the jump vectors of in-plane motion.

A.Schirmer, P.Heitjans: Zeitschrift für Naturforschung, 1995, 50a[7], 643-52