Oxide ion conductivity in the hexagonal perovskite derivative Ba3MoNbO8.5
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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.
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 . DOI: 10.1021/jacs.6b10730
Journal of the American Chemical Society
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
This research was supported by the Northern Research Partnership and the University of Aberdeen.
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