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Solid state NMR characterization of lithium conducting ceramics

journal contribution
posted on 01.07.1996, 00:00 authored by K Nairn, Maria ForsythMaria Forsyth, M Greville, D MacFarlane, M Smith
7Li 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 7Li 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 CQ (quadrupolar coupling constant) ~ 40 kHz, suggests that the lithium ions are hopping rapidly between equivalent, high electric field gradient sites. The 27Al and 31P magic angle spinning (MAS) spectra reveal an asymmetric phosphorus peak and two distinct aluminium resonances. The room temperature powder pattern of Li0.33La0.57TiO3 shows a dipolar broadened peak which narrows quite suddenly at 310 K revealing quadrupolar satellites with CQ ~ 900 Hz. A second lithium site is also observed in this material, as indicated by a further, weaker quadrupolar structure (CQ ~ 40 kHz).

History

Journal

Solid state ionics

Volume

86-88

Issue

Part 2

Pagination

1397 - 1402

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0167-2738

eISSN

1872-7689

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1996, Elsevier Science B.V.