Oxide Ion Conductivity in the Hexagonal Perovskite Derivative Ba3MoNbO8.5

Sacha Fop, Janet M. S. Skakle, Abbie C. McLaughlin* (Corresponding Author), Paul A. Connor, John T. S. Irvine, Ronald I. Smith, Eve J. Wildman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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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 (SOFCs) and solid oxide electrolyser cells (SOECs). Here we report the crystal structure and electrical properties of the hexagonal perovskite derivative Ba3MoNbO8.5. Ba3MoNbO8.5 crystallises 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 of 10-20 – 1 atm with a bulk conductivity of 2.2 x 10-3 S cm-1 at 600 degrees 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.
Original languageEnglish
Pages (from-to)16764-16769
Number of pages6
JournalJournal of the American Chemical Society
Issue number51
Early online date15 Dec 2016
Publication statusPublished - 28 Dec 2016

Bibliographical note

This research was supported by the Northern Research Partnership and the University of Aberdeen. We also acknowledge STFC-GB for provision of beamtime at ISIS.


  • Perovskite
  • fuel cell
  • oxide ion conduction


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