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

abstract

Perovskite titanates with nominal stoichiometry ABO(3+delta) are frequently reported in SOFC literature as having O-3 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-delta), although the oxygen excess is accommodated within the perovskite framework in randomly distributed short-range linear defects. Ibis compound was studied as potential fuel electrode due to its high total conductivity and stability in the most reducing conditions.

keywords

FUEL-CELLS; ANODES

subject category

Energy & Fuels; Materials Science

authors

Canales-Vazquez, J; Tao, S; Patrakeev, M; Irvine, JTS; Zhou, WB; Frade, J

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