Structure and conductivity of rutile niobium iron titanate

Peter I. Cowin, Christophe T G Petit, Rong Lan, Carl J. Schaschke, Shanwen Tao

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The structure and electrical conductivity of the solid solution Fe xTi1 - 2xNbxO2-δ (x = 0.1, 0.2, 0.3) have been investigated. A solid solution with the rutile structure is observed, along with an increase in unit cell volume with increasing substitution. The conductivity in 5% H2/Ar reduced with increasing doping levels, reaching a maximum of 2.67 S cm- 1 at 700 C for Fe0.1Ti0.8Nb0.1O2-δ. None of the compounds in this series were redox stable at 700 C in 5% H2/Ar, with increasing amounts of a haematite secondary phase observed with increased doping levels. Reduction at 900 C in 5% H2/Ar caused a significant increase in conductivity (8.34 S cm- 1 in 5%H2/Ar) at 700 C, suggesting that only partial reduction occurs at lower temperatures. The lack of redox stability and relatively low conductivities of these materials makes them unsuitable as a component of composite anode for IT-SOFC.

Original languageEnglish
Pages (from-to)48-53
Number of pages6
JournalSolid State Ionics
Volume236
Early online date15 Mar 2013
DOIs
Publication statusPublished - 2013

Fingerprint

Niobium
niobium
rutile
Solid solutions
Iron
Doping (additives)
iron
conductivity
Hematite
solid solutions
Solid oxide fuel cells (SOFC)
Anodes
low conductivity
Substitution reactions
hematite
Composite materials
anodes
substitutes
electrical resistivity
composite materials

Keywords

  • anode
  • conductivity
  • iron niobium titanate
  • rutile
  • solid oxide fuel cell

Cite this

Cowin, P. I., Petit, C. T. G., Lan, R., Schaschke, C. J., & Tao, S. (2013). Structure and conductivity of rutile niobium iron titanate. Solid State Ionics , 236, 48-53. https://doi.org/10.1016/j.ssi.2013.01.017
Cowin, Peter I. ; Petit, Christophe T G ; Lan, Rong ; Schaschke, Carl J. ; Tao, Shanwen. / Structure and conductivity of rutile niobium iron titanate. In: Solid State Ionics . 2013 ; Vol. 236. pp. 48-53.
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Cowin, PI, Petit, CTG, Lan, R, Schaschke, CJ & Tao, S 2013, 'Structure and conductivity of rutile niobium iron titanate', Solid State Ionics , vol. 236, pp. 48-53. https://doi.org/10.1016/j.ssi.2013.01.017

Structure and conductivity of rutile niobium iron titanate. / Cowin, Peter I.; Petit, Christophe T G; Lan, Rong; Schaschke, Carl J.; Tao, Shanwen.

In: Solid State Ionics , Vol. 236, 2013, p. 48-53.

Research output: Contribution to journalArticle

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AU - Cowin, Peter I.

AU - Petit, Christophe T G

AU - Lan, Rong

AU - Schaschke, Carl J.

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N2 - The structure and electrical conductivity of the solid solution Fe xTi1 - 2xNbxO2-δ (x = 0.1, 0.2, 0.3) have been investigated. A solid solution with the rutile structure is observed, along with an increase in unit cell volume with increasing substitution. The conductivity in 5% H2/Ar reduced with increasing doping levels, reaching a maximum of 2.67 S cm- 1 at 700 C for Fe0.1Ti0.8Nb0.1O2-δ. None of the compounds in this series were redox stable at 700 C in 5% H2/Ar, with increasing amounts of a haematite secondary phase observed with increased doping levels. Reduction at 900 C in 5% H2/Ar caused a significant increase in conductivity (8.34 S cm- 1 in 5%H2/Ar) at 700 C, suggesting that only partial reduction occurs at lower temperatures. The lack of redox stability and relatively low conductivities of these materials makes them unsuitable as a component of composite anode for IT-SOFC.

AB - The structure and electrical conductivity of the solid solution Fe xTi1 - 2xNbxO2-δ (x = 0.1, 0.2, 0.3) have been investigated. A solid solution with the rutile structure is observed, along with an increase in unit cell volume with increasing substitution. The conductivity in 5% H2/Ar reduced with increasing doping levels, reaching a maximum of 2.67 S cm- 1 at 700 C for Fe0.1Ti0.8Nb0.1O2-δ. None of the compounds in this series were redox stable at 700 C in 5% H2/Ar, with increasing amounts of a haematite secondary phase observed with increased doping levels. Reduction at 900 C in 5% H2/Ar caused a significant increase in conductivity (8.34 S cm- 1 in 5%H2/Ar) at 700 C, suggesting that only partial reduction occurs at lower temperatures. The lack of redox stability and relatively low conductivities of these materials makes them unsuitable as a component of composite anode for IT-SOFC.

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