caa a22 4500 463222849 CHVBK 20180405153217.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10853-006-0739-7 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0739-7 Oxygen transport in La2- x Sr x NiO4+δ: membrane permeation and defect chemical modelling [Elektronische Daten] [M. Schroeder, M.-A. Dragan] We describe a defect and transport model for acceptor doped $${\hbox{La}_{2-x}\hbox{Sr}_{x}\hbox{NiO}_{4+\delta}}$$ with the layered K2NiF4 structure. The model includes mobile oxygen interstitials in the rocksalt layers and oxygen vacancies in the perovskite layers of the crystal structure. Based on fits of literature data of the deviation from stoichiometry, defect concentrations have been calculated for La1.5Sr0.5NiO4+δ as a function of p(O2) for 1,073-1,223K. Application of the transport model to oxygen permeation data obtained in this work clearly indicates that the oxygen transport in La1.5Sr0.5NiO4+δ is primarily governed by migration of mobile oxygen interstitials. According to the model calculations, a significant contribution of vacancy migration to the oxygen permeation process is to be expected only for oxygen partial pressures lower than 10−5 bar at 1,223K and even lower partial pressures at 1,073 and 1,173K. As yet, permeation data are not available for such low partial pressures, which is why oxygen migration via vacancies could neither be confirmed nor ruled out. Springer Science+Business Media, LLC, 2007 Schroeder M. Institute of Physical Chemistry, RWTH Aachen, Landoltweg 2, 52056, Aachen, Germany aut Dragan M.-A Institute of Physical Chemistry, RWTH Aachen, Landoltweg 2, 52056, Aachen, Germany aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 1972-1983 0022-2461 42:6<1972 2007 42 10853 https://doi.org/10.1007/s10853-006-0739-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0739-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schroeder M. Institute of Physical Chemistry, RWTH Aachen, Landoltweg 2, 52056, Aachen, Germany aut NATIONALLICENCE 700 1- Dragan M.-A Institute of Physical Chemistry, RWTH Aachen, Landoltweg 2, 52056, Aachen, Germany aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 1972-1983 0022-2461 42:6<1972 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer