dc.contributor.author | Bernuy-Lopez, Carlos | |
dc.contributor.author | Høydalsvik, Kristin | |
dc.contributor.author | Einarsrud, Mari-Ann | |
dc.contributor.author | Grande, Tor | |
dc.date.accessioned | 2016-09-02T07:15:57Z | |
dc.date.accessioned | 2016-09-22T07:06:59Z | |
dc.date.available | 2016-09-02T07:15:57Z | |
dc.date.available | 2016-09-22T07:06:59Z | |
dc.date.issued | 2016 | |
dc.identifier.citation | Materials 2016, 9(3):154 | nb_NO |
dc.identifier.issn | 1996-1944 | |
dc.identifier.uri | http://hdl.handle.net/11250/2409616 | |
dc.description.abstract | The 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.language.iso | eng | nb_NO |
dc.publisher | MDPI | nb_NO |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-sa/4.0/ | |
dc.subject | layered double perovskite (LDP); cation and anion ordering; chemical expansion; solid oxide fuel cells | nb_NO |
dc.title | Effect of A-Site Cation Ordering onChemical Stability, Oxygen Stoichiometry andElectrical Conductivity in Layered LaBaCo2O5+dDouble Perovskite | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.date.updated | 2016-09-02T07:15:57Z | |
dc.source.volume | 9 | nb_NO |
dc.source.journal | Materials | nb_NO |
dc.source.issue | 3 | nb_NO |
dc.identifier.doi | 10.3390/ma9030154 | |
dc.identifier.cristin | 1377484 | |
dc.description.localcode | This is an open access article distributed under the Creative Commons Attribution License (CC BY 4.0). | nb_NO |