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Issue 26, 2009
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Cation ordering in Li containing garnets: synthesis and structural characterisation of the tetragonal system, Li7La3Sn2O12

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Abstract

In this paper we report synthesis, conductivity and structural data for the novel tetragonal garnet-related system, Li7La3Sn2O12. Neutron diffraction data shows that the tetragonal distortion is related to ordering of Li in three sites within the structure to ensure no short Li–Li interactions. Consistent with the ordered nature of the Li ions, the conductivity is low, with a high activation energy. The results are relevant to related highly conducting cubic garnets, Li5+xLn3−xAxM2O12 (Ln = rare earth, A = alkaline earth; M = Nb, Ta, Sb), showing how a high Li content can be accommodated by Li ordering within the garnet structure, supporting previous suggestions by Cussen for the cubic garnets, who proposed the presence of local ordering/clustering of Li in tetrahedral and “octahedral” sites to limit unfavourable short Li–Li interactions.

Graphical abstract: Cation ordering in Li containing garnets: synthesis and structural characterisation of the tetragonal system, Li7La3Sn2O12

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Publication details

The article was received on 09 Apr 2009, accepted on 17 Apr 2009 and first published on 12 May 2009


Article type: Paper
DOI: 10.1039/B907331K
Citation: Dalton Trans., 2009,0, 5177-5181

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    Cation ordering in Li containing garnets: synthesis and structural characterisation of the tetragonal system, Li7La3Sn2O12

    J. Percival, E. Kendrick, R. I. Smith and P. R. Slater, Dalton Trans., 2009, 0, 5177
    DOI: 10.1039/B907331K

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