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Issue 42, 2009
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Neutron diffraction structural study of the apatite-type oxide ion conductor, La8Y2Ge6O27: location of the interstitial oxide ion site

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Abstract

Apatite-type rare earth silicates/germanates have attracted considerable interest recently due to their high oxide ion conductivities. Despite evidence in support of a conduction mechanism involving interstitial oxide ions, the exact location of the interstitial oxide ion sites continues to attract controversy. In this paper we report a neutron diffraction structural study for the high oxygen excess compound, La8Y2Ge6O27. The structural model indicates that the oxide ions are located between the GeO4 tetrahedra, leading to significant localised distortions. These results, coupled with recent modelling studies, hence, support the conclusion that oxide ion migration proceeds via these tetrahedra.

Graphical abstract: Neutron diffraction structural study of the apatite-type oxide ion conductor, La8Y2Ge6O27: location of the interstitial oxide ion site

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Publication details

The article was received on 10 Jun 2009, accepted on 17 Jul 2009 and first published on 09 Sep 2009


Article type: Paper
DOI: 10.1039/B911404A
Citation: J. Mater. Chem., 2009,19, 7955-7958
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    Neutron diffraction structural study of the apatite-type oxide ion conductor, La8Y2Ge6O27: location of the interstitial oxide ion site

    E. Kendrick, A. Orera and P. R. Slater, J. Mater. Chem., 2009, 19, 7955
    DOI: 10.1039/B911404A

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