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Interfacing Oxides

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Publications::

S. Turner, R. Egoavil, M. Batuk, A. A. Abakumov, J. Hadermann, J. Verbeeck, G. Van Tendeloo
Site-specific mapping of transition metal oxygen coordination in complex oxides
Applied Physics Letters 101 (2012), 241910

We demonstrate site-specific mapping of the oxygen coordination number for transition metals in complex oxides using atomically resolved electron energy-loss spectroscopy in an aberration-corrected scanning transmission electron microscope. Pb2Sr2Bi2Fe6O16 contains iron with a constant Fe3+ valency in both octahedral and tetragonal pyramidal coordination and is selected to demonstrate the principle of site-specific coordination mapping. Analysis of the site-specific Fe-L2,3 data reveals distinct variations in the fine structure that are attributed to Fe in a six-fold (octahedron) or five-fold (distorted tetragonal pyramid) oxygen coordination. Using these variations, atomic resolution coordination maps are generated that are in excellent agreement with simulations.

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