Stimulated Li-7 echo NMR spectroscopy of slow ionic motions in a solid electrolyte

Lithium spin-alignment spectroscopy is presented as an NMR technique for st udying slow translational motions in solid and solid-like ionic conductors. We employ phase cycling that allows to measure two-time translational corr elation functions via the generation of a pure quadrupolar ordered state. C orrelation functions of the crystalline electrolyte Li3Sc2(PO4)(3) were rec orded for times ranging from about 0.1 ms to more than 10 s, implying that translational diffusion coefficients smaller than 10(-20) m(2)/s become acc essible. (C) 2000 Elsevier Science B.V. All rights reserved.