期刊
CHEMISTRY OF MATERIALS
卷 24, 期 10, 页码 1904-1909出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm300640g
关键词
oxygen coordination; valency; electron energy-loss spectroscopy; EELS; energy-loss near edge structure; ELNES; Fe-L-2,L-3 edge; Co-L-2,L-3 edge; brownmillerite
资金
- Fund for Scientific Research Flanders (FWO)
- NSERC of Canada
- NSERC
- McMaster University
- Canada Foundation for Innovation
- Ontario Government
- European Research Council [N 246791 COUNTATOMS, N 278510 VORTEX]
- Flemish Government
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-L-2,L-3 and the Fe-L-2,L-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.
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