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

Kendrick, Emma and Orera, Alodia and Slater, P.R. (2009) Neutron diffraction structural study of the apatite-type oxide ion conductor, La8Y2Ge6O27: location of the interstitial oxide ion site. Journal of Materials Chemistry, 19. pp. 7955-7958.

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URL of Published Version: http://pubs.rsc.org/en/content/articlelanding/2009/jm/b911404a

Identification Number/DOI: DOI: 10.1039/B911404A

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.

Type of Work:Article
Date:17 July 2009 (Publication)
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Chemistry
Keywords:solid oxide fuel cells; electrolyte, neutron diffraction, apatite
Subjects:QD Chemistry
Institution:University of Birmingham
Copyright Holders:Royal Society of Chemistry
ID Code:776
Refereed:YES
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