Title
Atomic resolution coordination mapping in <tex>$Ca_{2}FeCoO_{5}$</tex> brownmillerite by spatially resolved electron energy-loss spectroscopy Atomic resolution coordination mapping in <tex>$Ca_{2}FeCoO_{5}$</tex> brownmillerite by spatially resolved electron energy-loss spectroscopy
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Washington, D.C. ,
Subject
Physics
Chemistry
Source (journal)
Chemistry of materials / American Chemical Society. - Washington, D.C.
Volume/pages
24(2012) :10 , p. 1904-1909
ISSN
0897-4756
ISI
000304237500024
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Using a combination of high-angle annular dark field scanning transmission electron microscopy and atomically resolved electron energy-loss spectroscopy at high energy resolution in an aberration-corrected electron microscope, we demonstrate the capability of coordination mapping in complex oxides. Brownmillerite compound Ca2FeCoO5, consisting of repetitive octahedral and tetrahedral coordination layers with Fe and Co in a fixed 3+ valency, is selected to demonstrate the principle of atomic resolution coordination mapping. Analysis of the Co-L2,3 and the Fe-L2,3 edges shows small variations in the fine structure that can be specifically attributed to Co/Fe in tetrahedral or in octahedral coordination. Using internal reference spectra, we show that the coordination of the Fe and Co atoms in the compound can be mapped at atomic resolution.
E-info
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