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Issue 7, 2003
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Synthesis, structure and lithium-ion conductivity of Li2−2xMg2+x(MoO4)3 and Li3M(MoO4)3(MIII= Cr, Fe)

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Abstract

Lithium magnesium molybdates of the general formula Li2−2xMg2+x(MoO4)3, for 0 ≤ x ≤ 0.3, have been synthesized and their structure and lithium ion conductivity investigated. Determination of crystal structure of one of the members, Li2Mg2(MoO4)3, has revealed a three-dimensional framework consisting of metal–oxygen octahedra and trigonal prisms (where Li and Mg reside) which are interconnected by MoO4 tetrahedra. Although the framework is three-dimensional, lithium-ion conductivity appears to be restricted to the one-dimensional channels formed by interconnected trigonal prisms. Isotypic molybdates, Li3M(MoO4)3 (M = Cr, Fe), where lithium ions occupy exclusively the trigonal prismatic channels, exhibit a higher lithium ion conductivity than Li2−2xMg2+x(MoO4)3, lending support to the idea that the conductivity is one-dimensional in these materials. 7Li NMR spectral data are consistent with this interpretation.

Graphical abstract: Synthesis, structure and lithium-ion conductivity of Li2−2xMg2+x(MoO4)3 and Li3M(MoO4)3 (MIII = Cr, Fe)

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Publication details

The article was received on 03 Feb 2003, accepted on 16 May 2003 and first published on 03 Jun 2003


Article type: Paper
DOI: 10.1039/B301189E
Citation: J. Mater. Chem., 2003,13, 1797-1802
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    Synthesis, structure and lithium-ion conductivity of Li2−2xMg2+x(MoO4)3 and Li3M(MoO4)3 (MIII = Cr, Fe)

    L. Sebastian, Y. Piffard, A. K. Shukla, F. Taulelle and J. Gopalakrishnan, J. Mater. Chem., 2003, 13, 1797
    DOI: 10.1039/B301189E

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