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Atomic resolution coordination mapping in brownmillerite by spatially resolved electron energy-loss spectroscopy
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| Abstract |
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| 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. | |
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English
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| Source (journal) |
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Chemistry of materials / American Chemical Society. - Washington, D.C. |
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Washington, D.C. : 2012
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| ISSN |
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0897-4756
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24:10(2012), p. 1904-1909
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| ISI |
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000304237500024
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