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Journal of Electron Microscopy 51:99-104 (2002)
© 2002 Oxford University Press

Resonance effect in ELNES from perovskite-type manganites BiMnO3 and LaMnO3

Yasukazu Murakami 1,* , Daisuke Shindo1, Masae Kikuchi2, Jianm-Min Zuo3 and John C. H. Spence4

1Institute of Multidisciplinary Research for Advanced Materials and 2Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai, Japan, 3Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, IL 61801, USA and 4Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287-1504, USA

*To whom correspondence should be addressed. E-mail: murakami{at}tagen.tohoku.ac.jp

Fine structures in electron energy-loss spectra, observed 30–40 eV beyond the threshold of oxygen K-edges in perovskite-type manganites BiMnO3 and LaMnO3, are discussed. LaMnO3 with orthorhombic symmetry (space group Pbnm) shows a clear peak in this region. However, BiMnO3 with a heavily distorted perovskite-type structure (monoclinic, space group C2) does not show an appreciable peak. It is demonstrated that peaks in this energy region arise from the resonance effect of ejected core electrons and that the shape is sensitive to the environment of neighbouring oxygen atoms in the perovskite-type structures.

Keywords     EELS, ELNES, resonance effects, bond length, perovskite-type manganites


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