Solid state NMR characterization of lithium conducting ceramics

K. M. Nairn, M. Forsyth, M. Greville, D. R. MacFarlane, M. E. Smith

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Abstract

7 Li solid state NMR has been used to characterize lithium aluminium titanium phosphate and lithium lanthanum titanate ceramics. Both materials have high ionic mobilities at room temperature and this is reflected in their static 7 Li powder patterns. In the case of the phosphate based ceramic, a narrow Lorentzian peak is observed above 300 K, which narrows further with increasing temperature. The accompanying quadrupolar structure, with C Q (quadrupolar coupling constant) ∼ 40 kHz, suggests that the lithium ions are hopping rapidly between equivalent, high electric field gradient sites. The 27 Al and P magic angle spinning (MAS) spectra reveal an asymmetric phosphorus peak and two distinct aluminium resonances. The room temperature powder pattern of Li 0.33 La 0.57 TiO 3 shows a dipolar broadened peak which narrows quite suddenly at 310 K revealing quadrupolar satellites with C Q ∼ 900 Hz. A second lithium site is also observed in this material, as indicated by a further, weaker quadrupolar structure (C Q ∼ 40 kHz).

Original languageEnglish
Pages (from-to)1397-1402
Number of pages6
JournalSolid State Ionics
Volume86-88
Issue numberPART 2
DOIs
Publication statusPublished - 1 Jan 1996

Keywords

  • Li NMR
  • Ceramics
  • Ionic conduction
  • Quadrupole interaction

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