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Updated: Mar 8, 2026

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
Published on: June 9, 2023
Oxygen vacancy ordering in SrFe0.25Co0.75O2.63 perovskite material
Javier Fernández Sanjulián1, Madhu Chennabasappa2, Susana García-Martín3
1CNRS, 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.
Abstract:
SrFe0.25Co0.75O2.63 was 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 Sr3Y1Co4O10.5 oxide 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+)48fO10.52 is 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.
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