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

Emma Kendrick; Alodia Orera; Peter R. Slater

doi:10.1039/B911404A

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Journal of Materials Chemistry

Issue 42, 2009

Journal of Materials Chemistry was published between 1991 and 2012. From issue 1, 2013, it was replaced by three new journals: Journal of Materials Chemistry A, B and C

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

Emma Kendrick,^a^b Alodia Orera^c and Peter R. Slater*^c

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Chemical Sciences, University of Surrey, Guildford, UK

FiFe Batteries, E1 Culham Science Centre, Abingdon, UK

School of Chemistry, University of Birmingham, Birmingham, UK
E-mail: p.r.slater@bham.ac.uk ;
Fax: +44 (0)121 414403 ;
Tel: +44 (0)121 4148906

J. Mater. Chem., 2009,19, 7955-7958

DOI: 10.1039/B911404A
Received 10 Jun 2009, Accepted 17 Jul 2009
First published online 09 Sep 2009

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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.

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

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