Chemical Analysis at Atomic Resolution of Isolated Extended Defects in an Oxygen‐Deficient, Complex Manganese Perovskite
- 27 December 2013
- journal article
- research article
- Published by Wiley in Chemistry – A European Journal
- Vol. 20 (5) , 1237-1241
Abstract
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.Keywords
This publication has 22 references indexed in Scilit:
- Magnetoresistance in La0.5Sr0.5MnO2.5Chemistry – A European Journal, 2011
- Aberration-Corrected Imaging in Transmission Electron Microscopy2010
- Synthesis and Structural Characterization of La1−xAxMnO2.5 (A = Ba, Sr, Ca) Phases: Mapping the Variants of the Brownmillerite StructureChemistry of Materials, 2009
- Ordered Rock-Salt Related Nanoclusters in CaMnO2Journal of the American Chemical Society, 2009
- Synthesis and structural characterization of LaxSr1−xMnO2.6+δ (0.1<x<0.4) compounds displaying compressed octahedral coordination of Mn(4−5x)+Journal of Solid State Chemistry, 2009
- Oxygen Ordered Phases in LaxSr1−xMnOy (0 ≤ x ≤ 0.2, 2.5 ≤ y ≤ 3): An In situ Neutron Powder Diffraction StudyChemistry of Materials, 2008
- Ferromagnetism in a New Manganese-Related Brownmillerite: La0.5Sr0.5MnO2.5Chemistry – A European Journal, 2007
- Charge and structural ordering in the brownmillerite phases: La1−xSrxMnO2.5 (0.2<x<0.4)Journal of Solid State Chemistry, 2006
- Complexity in Strongly Correlated Electronic SystemsScience, 2005
- Low Temperature Magnetoresistance and the Magnetic Phase Diagram ofPhysical Review Letters, 1995