Title
Influence of the microstructure on the high-temperature transport properties of <tex>$GdBaCo_{2}O_{5.5+\delta}$</tex> epitaxial filmsInfluence of the microstructure on the high-temperature transport properties of <tex>$GdBaCo_{2}O_{5.5+\delta}$</tex> epitaxial films
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Electron microscopy for materials research (EMAT)
Publication type
article
Publication
Washington, D.C.,
Subject
Physics
Source (journal)
Chemistry of materials / American Chemical Society. - Washington, D.C.
Volume/pages
22(2010):19, p. 5512-5520
ISSN
0897-4756
ISI
000282471000013
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Epitaxial thin films of GdBaCo2O5.5+δ (GBCO) grown by pulsed laser deposition have been studied as a function of deposition conditions. The variation in film structure, domain orientation, and microstructure upon deviations in the cation composition have been correlated with the charge transport properties of the films. The epitaxial GBCO films mainly consist of single- and double-perovskite regions that are oriented in different directions depending on the deposition temperature. Additionally, cobalt depletion induces the formation of a high density of stacking defects in the films, consisting of supplementary GdO planes along the c-axis of the material. The presence of such defects progressively reduces the electrical conductivity. The films closer to the stoichiometric composition have shown p-type electronic conductivity at high pO2 with values as high as 800 S/cm at 330 °C in 1 atm O2, and with a pO2 power dependence with an exponent as low as 1/25, consistent with the behavior reported for bulk GBCO. These values place GBCO thin films as a very promising material to be applied as cathodes in intermediate temperature solid oxide fuel cells.
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