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dc.contributor.authorBernuy-Lopez, Carlos
dc.contributor.authorHøydalsvik, Kristin
dc.contributor.authorEinarsrud, Mari-Ann
dc.contributor.authorGrande, Tor
dc.identifier.citationMaterials 2016, 9(3):154nb_NO
dc.description.abstractThe effect of the A-site cation ordering on the chemical stability, oxygen stoichiometry and electrical conductivity in layered LaBaCo2O5+δ double perovskite was studied as a function of temperature and partial pressure of oxygen. Tetragonal A-site cation ordered layered LaBaCo2O5+δ double perovskite was obtained by annealing cubic A-site cation disordered La0.5Ba0.5CoO3-δ perovskite at 1100 °C in N2. High temperature X-ray diffraction between room temperature (RT) and 800 °C revealed that LaBaCo2O5+δ remains tetragonal during heating in oxidizing atmosphere, but goes through two phase transitions in N2 and between 450 °C and 675 °C from tetragonal P4/mmm to orthorhombic Pmmm and back to P4/mmm due to oxygen vacancy ordering followed by disordering of the oxygen vacancies. An anisotropic chemical and thermal expansion of LaBaCo2O5+δ was demonstrated. La0.5Ba0.5CoO3-δ remained cubic at the studied temperature irrespective of partial pressure of oxygen. LaBaCo2O5+δ is metastable with respect to La0.5Ba0.5CoO3-δ at oxidizing conditions inferred from the thermal evolution of the oxygen deficiency and oxidation state of Co in the two materials. The oxidation state of Co is higher in La0.5Ba0.5CoO3-δ resulting in a higher electrical conductivity relative to LaBaCo2O5+δ. The conductivity in both materials was reduced with decreasing partial pressure of oxygen pointing to a p-type semiconducting behavior.nb_NO
dc.subjectlayered double perovskite (LDP); cation and anion ordering; chemical expansion; solid oxide fuel cellsnb_NO
dc.titleEffect of A-Site Cation Ordering onChemical Stability, Oxygen Stoichiometry andElectrical Conductivity in Layered LaBaCo2O5+dDouble Perovskitenb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.localcodeThis is an open access article distributed under the Creative Commons Attribution License (CC BY 4.0).nb_NO

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