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Energy Loss by Channeled Electrons: A Quantitative Study on Transition Metal Oxides
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2013 (English)In: Microscopy and Microanalysis, ISSN 1431-9276, E-ISSN 1435-8115, Vol. 19, no 6, 1586-1594 p.Article in journal (Refereed) Published
Abstract [en]

Electron energy-loss spectroscopy (EELS) attached to current   transmission electron microscopes can probe not only element-selective   chemical information, but also site-selective information that depends   on the position that a specific element occupies in a crystal lattice.   The latter information is exploited by utilizing the Bloch waves   symmetry in the crystal, which changes with its orientation with respect   to the incident electron wave (electron channeling). We demonstrate the   orientation dependence of the cross-section of the electron energy-loss   near-edge structure for particular crystalline sites of spinel ferrites,   by quantitatively taking into account the dynamical diffraction effects   with a large number of the diffracted beams. The theoretical results are   consistent with a set of experiments in which the transition metal sites   in spinel crystal structures are selectively excited. A new measurement   scheme for site-selective EELS using a two-dimensional   position-sensitive detector is proposed and validated by theoretical   predictions and trial experiments.

Place, publisher, year, edition, pages
2013. Vol. 19, no 6, 1586-1594 p.
National Category
Condensed Matter Physics
Research subject
Materials Science
URN: urn:nbn:se:uu:diva-220054DOI: 10.1017/S1431927613013214ISI: 000330344800025OAI: oai:DiVA.org:uu-220054DiVA: diva2:703947
Available from: 2014-03-10 Created: 2014-03-10 Last updated: 2014-03-10Bibliographically approved

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Rusz, Jan
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