Dedicated to Professor Werner Müller- Warmuth on the occasion of his 65th birthday Investigations of Li diffusion in stage-1 and stage-2 Li graphite intercalation compounds with neutron time-of-flight and backscattering techniques and ^-radiation detected nuclear magnetic resonance/relaxation

Dedicated to Professor Werner MüllerWarmuth on the occasion of his 65th birthday Investigations of Li diffusion in stage-1 and stage-2 Li graphite intercalation compounds with neutron time-of-flight and backscattering techniques and ^-radiation detected nuclear magnetic resonance/relaxation (/J-NMR) with the nucleus 8Li(T1/2 = 0.8 s) are reviewed and compared. De­ pending on temperature, the spin-lattice relaxation-rate T{1 of 8Li is governed by different pro­ cesses. Above 300 K, Tf1 (T) shows maxima induced by long-range Li+ diffusion. Jump correlation times are estimated. Inspection of the B field dependence of T f1 revealed two-dimensional diffusion behaviour. The neutron spectra showed a quasielastic line broadening above 500 K, which was used to obtain diffusion coefficients and to trace jump vectors of the in-plane motion. The diffusion parameters observed with both techniques are compared, and differences that show up are dis­ cussed. In addition, the low-temperature spin-lattice relaxation rates, being due to coupling to conduction electrons, are used to explore electronic properties.