From ultraslow to fast lithium diffusion in the 2D ion conductor Li0.7TiS2 probed directly by stimulated-echo NMR and nuclear magnetic relaxation

M. Wilkening, W. Küchler, P. Heitjans

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Li7 stimulated-echo NMR and classical relaxation NMR techniques are jointly used for the first time for a comprehensive investigation of Li diffusion in layer-structured Li0.7TiS2. One single 2D Li diffusion process was probed over a dynamic range of almost 10 orders of magnitude. So far, this is the largest dynamic range being measured by Li7 NMR spectroscopy directly, i.e., without the help of a specific theoretical model. The jump rates obey a strict Arrhenius law, determined by an activation energy of 0.41(1)eV and a preexponential factor of 6.3(1)×1012s-1, and range between 1×10-1s-1 and 7.8×108s-1 (148-510K). Ultraslow Li jumps in the kHz to sub-Hz range were measured directly by recording Li7 spin-alignment correlation functions. The temperature and, in particular, the frequency dependence of the relaxation rates fully agree with results expected for 2D diffusion.

Original languageEnglish
Article number065901
JournalPhysical Review Letters
Volume97
Issue number6
DOIs
Publication statusPublished - 17 Aug 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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