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Energy Loss by Channeled Electrons: A Quantitative Study on Transition Metal Oxides

Published online by Cambridge University Press:  29 August 2013

Kazuyoshi Tatsumi ,
Shunsuke Muto  and
Ján Rusz
Kazuyoshi Tatsumi*
Affiliation:
Department of Materials, Physics and Energy Engineering, Nagoya University, Chikusa, Nagoya, Aichi Pref. 464-8603, Japan
Shunsuke Muto
Affiliation:
Department of Materials, Physics and Energy Engineering, Nagoya University, Chikusa, Nagoya, Aichi Pref. 464-8603, Japan
Ján Rusz
Affiliation:
Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden
*
*Corresponding author. E-mail: k-tatsumi@nucl.nagoya-u.ac.jp
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Abstract

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.

Keywords

EELSelectron channelingdynamical diffraction effectsite-specific ELNES
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 19 , Issue 6 , December 2013 , pp. 1586 - 1594
Copyright
Copyright © Microscopy Society of America 2013 

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Footnotes

This research was performed primarily at Nagoya University.

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