title: Oxygen vacancy ordering in SrFe0.25Co0.75O2.63perovskite material.
abstract: SrFe0.25Co0.75O2.63was synthesized by a solid-state reaction. Its structural study at room temperature using conventional X-ray as well as neutron powder diffraction, electron diffraction and high-resolution transmission electron microscopy is presented. An oxygen-vacancy ordering related to the "314" model known for the Sr3Y1Co4O10.5oxide is proposed despite neither an A-site ordering nor an A-site mismatch. By means of Mössbauer spectroscopy, Mohr salt titration and the difference in the neutron cross sections of Fe and Co, a cation distribution within the crystallographic sites as the following Sr4(Fe0.143+Co0.363+)48h(Fe0.114+Co0.144+Co0.253+)48fO10.52is suggested, highlighting a natural layered structure with Fe and Co in higher oxidation states in the oxygen replete layers than in the oxygen deficient ones.
authors.affiliation: CNRS, Université de Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France. olivier.toulemonde@icmcb.cnrs.fr and Dpto. Química Inorgánica, Facultad de CC. Químicas, U. Complutense de Madrid, 28040-Madrid, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Fernández Sanjulián
authors.affiliation: CNRS, Université de Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France. olivier.toulemonde@icmcb.cnrs.fr.
authors.forename: Madhu
authors.initials: M
authors.lastname: Chennabasappa
authors.affiliation: Dpto. Química Inorgánica, Facultad de CC. Químicas, U. Complutense de Madrid, 28040-Madrid, Spain.
authors.forename: Susana
authors.initials: S
authors.lastname: García-Martín
authors.affiliation: Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France.
authors.forename: Gwilherm
authors.initials: G
authors.lastname: Nénert
authors.affiliation: CNRS, Université de Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France. olivier.toulemonde@icmcb.cnrs.fr.
authors.forename: Alain
authors.initials: A
authors.lastname: Wattiaux
authors.affiliation: CNRS, Université de Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France. olivier.toulemonde@icmcb.cnrs.fr.
authors.forename: Etienne
authors.initials: E
authors.lastname: Gaudin
authors.affiliation: CNRS, Université de Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France. olivier.toulemonde@icmcb.cnrs.fr.
authors.forename: Olivier
authors.initials: O
authors.lastname: Toulemonde