Chemical analysis at atomic resolution of isolated extended defects in an oxygen-deficient, complex manganese perovskite
| Autor: | Almudena Torres-Pardo, José M. González-Calbet, Jose M. Alonso, M. Luisa Ruiz-González, Daniel González-Merchante, Raquel Cortés-Gil |
|---|---|
| Přispěvatelé: | Ministerio de Ciencia e Innovación (España), Universidad Complutense de Madrid |
| Rok vydání: | 2013 |
| Předmět: |
Aberration‐corrected microscopy
Electron energy loss spectroscopy Organic Chemistry Atomic‐resolution STEM Analytical chemistry Extended defects chemistry.chemical_element General Chemistry Manganese Electron energy loss spectroscopy (EELS) Colossal magnetoresistant oxides Dark field microscopy Oxygen Catalysis Characterization (materials science) Crystallography chemistry Octahedron Microscopy Perovskite (structure) |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1521-3765 |
| Popis: | A 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. This work has been partially supported by grants from the Spanish Ministerio de Ciencia e Innovación: CSD2009–00013, MAT2007–61954, MAT2011–23068. Research by R.C.‐G. and A.T.‐P. has also been supported by a PICATA postdoctoral fellowship from the Moncloa Campus of International Excellence (UCM) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text