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Oxide ion conductivity in the hexagonal perovskite derivative Ba3MoNbO8.5

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Connor_2016_JACS_HexagonalPerovskite_AAM.pdf (1.076Mb)
Date
28/12/2016
Author
Fop, Sacha
Skakle, Janet M. S.
McLaughlin, Abbie C.
Connor, Paul A.
Irvine, John T. S.
Smith, Ronald I.
Wildman, Eve J.
Keywords
QD Chemistry
Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry
NDAS
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Abstract
Oxide ion conductors are important materials with a range of technological applications and are currently used as electrolytes for solid oxide fuel cells and solid oxide electrolyzer cells. Here we report the crystal structure and electrical properties of the hexagonal perovskite derivative Ba3MoNbO8.5. Ba3MoNbO8.5 crystallizes in a hybrid of the 9R hexagonal perovskite and palmierite structures. This is a new and so far unique crystal structure that contains a disordered distribution of (Mo/Nb)O6 octahedra and (Mo/Nb)O4 tetrahedra. Ba3MoNbO8.5 shows a wide stability range and exhibits predominantly oxide ion conduction over a pO2 range from 10-20 to 1 atm with a bulk conductivity of 2.2 × 10-3 S cm-1 at 600 °C. The high level of conductivity in a new structure family suggests that further study of hexagonal perovskite derivatives containing mixed tetrahedral and octahedral geometry could open up new horizons in the design of oxygen conducting electrolytes.
Citation
Fop , S , Skakle , J M S , McLaughlin , A C , Connor , P A , Irvine , J T S , Smith , R I & Wildman , E J 2016 , ' Oxide ion conductivity in the hexagonal perovskite derivative Ba 3 MoNbO 8.5 ' , Journal of the American Chemical Society , vol. 138 , no. 51 , pp. 16764-16769 . https://doi.org/10.1021/jacs.6b10730
Publication
Journal of the American Chemical Society
Status
Peer reviewed
DOI
https://doi.org/10.1021/jacs.6b10730
ISSN
0002-7863
Type
Journal article
Rights
Copyright © 2016 American Chemical Society. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/jacs.6b10730
Description
This research was supported by the Northern Research Partnership and the University of Aberdeen.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12237

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