6Li and 7Li two-time spin-alignment echo nuclear magnetic resonance correlation functions of single-crystalline Li3N were recorded. Around room temperature, the decay of the spin-alignment echo amplitudes was induced by slow Li jumps perpendicular to the Li2N layers. The hopping correlation functions could be best represented by a single exponential. The measured jump rates were consistent with those which were previously determined by 8Li β-radiation detected nuclear magnetic resonance at much lower temperatures. Taking the results from 6Li and 7Li nuclear magnetic resonance as well as from 8Li β- nuclear magnetic resonance together, between 360 and 220K Arrhenius behaviour was found. The corresponding activation energy was 0.65eV and the pre-exponential factor turned out to be 6.4 x 1013/s. Although probed from a microscopic point of view, the nuclear magnetic resonance diffusion parameters were in very good agreement with those obtained from dc-conductivity measurements, being sensitive to macroscopic transport properties.

Diffusion Parameters in Single-Crystalline Li3N as Probed by 6Li and 7Li Spin-Alignment Echo NMR Spectroscopy in Comparison with Results from 8Li Β-Radiation Detected NMR. M.Wilkening, D.Gebauer, P.Heitjans: Journal of Physics - Condensed Matter, 2008, 20[2], 022201 (5pp)