期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 20, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/20/02/022201
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(6)Li and (7)Li two-time spin-alignment echo NMR correlation functions of single-crystalline Li(3)N are recorded. Around room temperature, the decay of the spin-alignment echo amplitudes is induced by slow Li jumps perpendicular to the Li(2)N layers. The hopping correlation functions can be best represented by a single exponential. The measured jump rates are consistent with those which were previously determined by (8)Li beta-radiation detected NMR at much lower temperatures. Taking the results from 6Li and 7Li NMR as well as from (8)Li beta-NMR together, between 360 and 220 K Arrhenius behaviour is found. The corresponding activation energy is 0.65(1) eV and the pre-exponential factor turned out to be 6.4(5) x 10(13) s(-1). Although probed from a microscopic point of view, the NMR diffusion parameters are in very good agreement with those obtained from dc-conductivity measurements, being sensitive to macroscopic transport properties.
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