Exceptional Layered Ordering of Cobalt and Iron in Perovskites

O.I. Lebedev (1) , S. Turner (2) , V. Caignaert (1) , V.A. Cherepanov (3) , B. Raveau (1)

1 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
2 Electron Microscopy for Materials Science - EMAT (Antwerp, Belgium)
3 UrFU - Ural Federal University [Ekaterinburg]

A study is conducted to demonstrate exceptional layered ordering of cobalt and iron in perovskites. This exceptional type of cationic ordering suggests that the oxygen stoichiometry may play a role in its stabilization, resulting from the alternate stacking of double perovskite slices YBaCo2O5 and triple perovskite slices with the ideal composition YBa2Fe3O8. Annular bright field STEM (ABF-STEM) imaging has been carried out to understand the distribution of oxygen vacancies in the structure.

Keywords: Cobalt; Oxygen vacancies; Bright fields; Cationic ordering; Double perovskites; Layered ordering; Oxygen stoichiometry; Triple perovskite; Perovskite; Oxides; Chemical structure; Perovskites; Layers; Oxygen

Domains: Chemical Sciences; Cristallography; Theoretical and/or physical chemistry; Material chemistry

O.I. Lebedev, S. Turner, V. Caignaert, V.A. Cherepanov, B. Raveau. Exceptional Layered Ordering of Cobalt and Iron in Perovskites. Chemistry of Materials, 2016, 28 (9), pp.2907-2911. ⟨10.1021/acs.chemmater.6b01046⟩. ⟨hal-02184743⟩