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Nanometer Crystal Structure Analysis by EF-CBED and EF-Microscopy

Published online by Cambridge University Press:  02 July 2020

K. Tsuda
Affiliation:
Research Institute for Scientific Measurements, Tohoku University, Sendai, 980-8577JAPAN
M. Tanaka
Affiliation:
Research Institute for Scientific Measurements, Tohoku University, Sendai, 980-8577JAPAN
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Extract

Crystal structure refinement by the convergent-beam electron diffraction (CBED) method has the following advantages: (i) Nanometer-size crystal structure refinement: CBED patterns can be obtained from specimen areas of a few nanometer in diameter, (ii) Dynamical diffraction effect: the CBED intensities contain phase information of crystal structure factors through the strong dynamical effect. (iii) Site-selective analysis: the use of Bloch states formed by incident electrons allows structure determination weighted for specific atom sites. Energy-filtering (EF) to revome inelastically scattered background is now getting necessary for such quantitative analysis of CBED patterns. Especially for the determination of atom positions and Debye-Waller factors, the use of energy-filtered higher-order Laue zone (HOLZ) CBED patterns is essential because small displacements of atoms can be sensitively detected using HOLZ reflections with large reciprocal vectors. For this purpose, we developed a new fl-filter transmission electron microscope (JEM-2010FEF) with a high acceptance angle [2] and a new analysis program “mbfit” to refine structural parameters using many-beam Bloch-wave calculations and least-square fitting [1].

Type
Electron Energy-Loss Spectroscopy (EELS) and Imaging
Copyright
Copyright © Microscopy Society of America

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References

1.Tsuda, K. and Tanaka, M., Acta Cryst., A55 (1999) 939.CrossRefGoogle Scholar
2.Tanaka, M. et al., J. Microscopy, 194, (1999) 219.CrossRefGoogle Scholar
3.Hashimoto, T. et al., submitted to Sol. Stat. Ionics.Google Scholar