caa a22 4500 445362588 CHVBK 20180317142919.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s10832-011-9658-3 doi (NATIONALLICENCE)springer-10.1007/s10832-011-9658-3 Oxygen incorporation in porous thin films of strontium doped lanthanum ferrite [Elektronische Daten] [Martin Søgaard, Anja Bieberle-Hütter, Peter Hendriksen, Mogens Mogensen, Harry Tuller] Electrical conductivity relaxation measurements were carried out on thin films of (La0.6Sr0.4)0.99 FeO3 − δ deposited on MgO (100) substrates by pulsed laser deposition in order to determine the surface exchange coefficient, k Ex, of the oxygen incorporation process in the temperature range 550-700°C. The composition of the films was verified using wavelength dispersive x-ray and Rutherford backscattering spectroscopy. Scanning electron microscopy showed small triangular crystallites with the largest dimension 80 nm and the smallest dimension 10 nm. X-ray diffraction showed a cubic perovskite structure and significant texturing. At a constant temperature, k Exwas found to be a function only of the final $p_{\mathrm{O_{2}}}$ of the $p_{\mathrm{O_{2}}}$ -changes the sample was subjected to during conductivity relaxation experiments, confirming that the magnitude of the exchange coefficient was not influenced by changes in ionic defect concentrations. The k Ex-values determined for these thin films were significantly lower than for bulk samples. A value of 3.6 × 10 − 6 cm s − 1 was obtained at 702°C and a final $p_{\mathrm{O_{2}}}$ of 0.048 atm, approximately a factor of six lower than that obtained for bulk samples. An activation energy of 282 ± 20 kJ mol − 1 was found for the surface exchange coefficient at $p_{\mathrm{O_{2}}}$ = 0.048 atm. Possible reasons for the reduced magnitude of k Exare discussed including the role of thermal history in influencing surface morphology and chemistry. Springer Science+Business Media, LLC, 2011 Thin film nationallicence LSF nationallicence Conductivity relaxation nationallicence Solid oxide fuel cells nationallicence Oxygen reduction kinetics nationallicence Sensors nationallicence Søgaard Martin Risø National Laboratory for Sustainable Energy, Fuel Cells and Solid State Chemistry Division, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, 4000, Roskilde, Denmark aut Bieberle-Hütter Anja Nonmetallic Inorganic Materials, ETH Zurich, Wolfgang-Pauli-Str. 10, 8093, Zürich, Switzerland aut Hendriksen Peter Risø National Laboratory for Sustainable Energy, Fuel Cells and Solid State Chemistry Division, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, 4000, Roskilde, Denmark aut Mogensen Mogens Risø National Laboratory for Sustainable Energy, Fuel Cells and Solid State Chemistry Division, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, 4000, Roskilde, Denmark aut Tuller Harry Crystal Physics and Electroceramics Laboratory, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut Journal of Electroceramics Springer US; http://www.springer-ny.com 27/3-4(2011-12-01), 134-142 1385-3449 27:3-4<134 2011 27 10832 https://doi.org/10.1007/s10832-011-9658-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10832-011-9658-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Søgaard Martin Risø National Laboratory for Sustainable Energy, Fuel Cells and Solid State Chemistry Division, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, 4000, Roskilde, Denmark aut NATIONALLICENCE 700 1- Bieberle-Hütter Anja Nonmetallic Inorganic Materials, ETH Zurich, Wolfgang-Pauli-Str. 10, 8093, Zürich, Switzerland aut NATIONALLICENCE 700 1- Hendriksen Peter Risø National Laboratory for Sustainable Energy, Fuel Cells and Solid State Chemistry Division, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, 4000, Roskilde, Denmark aut NATIONALLICENCE 700 1- Mogensen Mogens Risø National Laboratory for Sustainable Energy, Fuel Cells and Solid State Chemistry Division, Technical University of Denmark, Frederiksborgvej 399, P.O. Box 49, 4000, Roskilde, Denmark aut NATIONALLICENCE 700 1- Tuller Harry Crystal Physics and Electroceramics Laboratory, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA aut NATIONALLICENCE 773 0- Journal of Electroceramics Springer US; http://www.springer-ny.com 27/3-4(2011-12-01), 134-142 1385-3449 27:3-4<134 2011 27 10832 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer