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Chemical analysis at atomic resolution of isolated extended defects in an oxygen-deficient, complex manganese perovskite

AuthorsRuíz-González, M. L.; Cortés-Gil, R.; Torres-Pardo, Almudena; González-Merchante, Daniel; Alonso, José M. CSIC; González-Calbet, José M.
KeywordsElectron energy loss spectroscopy (EELS)
Extended defects
Atomic‐resolution STEM
Aberration‐corrected microscopy
Colossal magnetoresistant oxides
Issue Date27-Jan-2014
PublisherJohn Wiley & Sons
CitationChemistry - a European Journal 20(5): 1237-1241 (2014)
AbstractA general approach to the structural and analytical characterization of complex bulk oxides that exploits the advantage of the atomic spatial resolution and the analytical capability of aberration-corrected microscopy is described. The combined use of imaging and spectroscopic techniques becomes necessary to the complete characterization of the oxygen-deficient colossal magnetoresistant La0.56Sr0.44MnO2.5-related perovskite. In this compound, the formation of isolated (La/Sr)O and MnO rock-salt-type planar defects are identified from atomically resolved High Angle Annular Dark Field (HAADF) images. The location of the oxygen atomic columns from Annular Bright Field (ABF) images indicates edge-sharing MnO6 octahedra in the MnO planes and the study performed by Electron Energy Loss Spectroscopy (EELS) reveals different Mn oxidation states derived from the corner-or edge-sharing MnO6 octahedra environment.
Publisher version (URL)https://doi.org/10.1002/chem.201303895
Appears in Collections:(ICMM) Artículos
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