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Studies on the perovskite-based La4Srn-4Ti nO3n+2

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Jesús Canales-Vázquez, Shawen Tao, Mikhail Patrakeev, John T.S. Irvine, Wuzong Zhou, Jorge Frade

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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 (La4Sr 6Ti12O38-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.



Original languageEnglish
Number of pages6
Publication statusPublished - 1 Dec 2003
EventMaterials and Technology for Hydrogen Economy - Boston, MA., United States
Duration: 1 Dec 20033 Dec 2003


ConferenceMaterials and Technology for Hydrogen Economy
CountryUnited States
CityBoston, MA.

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