NMR-Study of Structure and Diffusion Processes in Li3N

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Abstract
Quadrupole split NMR-spectra of 7Li and 14N in single crystals of Li3N were measured as a function of orientation to the magnetic field. The results confirm the model of ionic bonding. From the temperature dependence of both the 7Li spectra and the relaxation rate Ɖ1 of 7Li at least two diffusion processes could be determined which are in agreement with the strong anisotropy of the ionic conductivity. Below 300 K nearly all diffusion takes place in the Li2N layer with an activation enthalpy of about 0.25 eV. The jump rate of the ions can be increased by doping the crystals with hydrogen. At higher temperatures there is a considerable amount of interplanar diffusion involving both Li positions

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