Oxide Ion Conductivity in the Hexagonal Perovskite Derivative Ba3MoNbO8.5

Sacha Fop, Jan Skakle, Abbie McLaughlin, Paul A. Connor, John T S Irvine, Ronald I. Smith, Eve J. Wildman

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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 (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
Volume138
Issue number51
Early online date2 Dec 2016
DOIs
Publication statusPublished - 28 Dec 2016

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Perovskite
Oxides
Ions
Derivatives
Electrolytes
Crystal structure
Solid oxide fuel cells (SOFC)
Electric properties
Oxygen
Geometry
perovskite

Keywords

  • Perovskite
  • fuel cell
  • oxide ion conduction

Cite this

Oxide Ion Conductivity in the Hexagonal Perovskite Derivative Ba3MoNbO8.5. / Fop, Sacha; Skakle, Jan; McLaughlin, Abbie; Connor, Paul A.; Irvine, John T S ; Smith, Ronald I.; Wildman, Eve J.

In: Journal of the American Chemical Society, Vol. 138, No. 51, 28.12.2016, p. 16764-16769.

Research output: Contribution to journalArticle

Fop, Sacha ; Skakle, Jan ; McLaughlin, Abbie ; Connor, Paul A. ; Irvine, John T S ; Smith, Ronald I. ; Wildman, Eve J. / Oxide Ion Conductivity in the Hexagonal Perovskite Derivative Ba3MoNbO8.5. In: Journal of the American Chemical Society. 2016 ; Vol. 138, No. 51. pp. 16764-16769.
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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 (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.",
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AU - Fop, Sacha

AU - Skakle, Jan

AU - McLaughlin, Abbie

AU - Connor, Paul A.

AU - Irvine, John T S

AU - Smith, Ronald I.

AU - Wildman, Eve J.

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PY - 2016/12/28

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N2 - 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.

AB - 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.

KW - Perovskite

KW - fuel cell

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