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Studies on the perovskite-based La4Srn−4TinO3n+2

Published online by Cambridge University Press:  26 February 2011

Jesús Canales-Vázquez ,
Shawen Tao ,
Mikhail Patrakeev ,
John T. S. Irvine ,
Wuzong Zhou  and
Jorge Frade
Jesús Canales-Vázquez
Affiliation:
School of Chemistry, Purdie Building, University of St Andrews, St Andrews, Fife KY16 9ST, Scotland (UK).
Shawen Tao
Affiliation:
School of Chemistry, Purdie Building, University of St Andrews, St Andrews, Fife KY16 9ST, Scotland (UK).
Mikhail Patrakeev
Affiliation:
Ceramics and Glass Eng. Dep., CICECO, University of Aveiro, 3810–193 Aveiro, Portugal.
John T. S. Irvine
Affiliation:
School of Chemistry, Purdie Building, University of St Andrews, St Andrews, Fife KY16 9ST, Scotland (UK).
Wuzong Zhou
Affiliation:
School of Chemistry, Purdie Building, University of St Andrews, St Andrews, Fife KY16 9ST, Scotland (UK).
Jorge Frade
Affiliation:
Ceramics and Glass Eng. Dep., CICECO, University of Aveiro, 3810–193 Aveiro, Portugal.
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Abstract

Perovskite titanates with nominal stoichiometry ABO3+Δ are frequently reported in SOFC literature as having O3 stoichiometry. Such phases often exhibit quite interesting properties, but are not stoichiometric and the structural characterisation is usually not rigorous. Here we demonstrate how oxygen excess can be incorporated in a titanate perovskite-based lattice as crystallographic oxygen shears giving rise to the homologous series La4Srn−4TinO3n+2. The layered structure is lost for the n=12 member (La4Sr8Ti12O38−Δ), although the oxygen excess is accommodated within the perovskite framework in randomly distributed short-range linear defects. This compound was studied as potential fuel electrode due to its high total conductivity and stability in the most reducing conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 801: Symposium BB – Materials and Technologies for a Hydrogen Economy , 2003 , BB6.7
Copyright
Copyright © Materials Research Society 2004

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References

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