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The effect of inelastic scattering on crystal structure refinement from electron diffraction patterns recorded under
J Jansen1, H W Zandbergen, M T Otten
1Department of Nanoscience, Laboratory of Materials Science, Delft University of Technology, National Centre for HREM, Rotterdamseweg 137, Delft 2628 AL, The Netherlands. joukj@hrem.stm.tudelft.nl
Ultramicroscopy
|March 30, 2004
Summary
Energy filtering does not significantly improve crystal structure analysis accuracy from parallel electron beam diffraction data. This finding holds true even with increased energy-loss electrons, ensuring reliable atomic position determination.
Area of Science:
- Materials Science
- Crystallography
- Electron Microscopy
Background:
- Crystal structure determination commonly uses electron diffraction data.
- Energy filtering enhances contrast in convergent beam electron diffraction (CBED).
- The impact of energy filtering on parallel beam electron diffraction (PBED) structure analysis is less understood.
Purpose of the Study:
- To investigate if energy filtering improves structure analysis accuracy in PBED.
- To compare structure refinement results using unfiltered, zero-loss, and plasmon-loss electrons.
- To assess the influence of energy-loss electrons on structure refinement.
Main Methods:
- Recorded electron diffraction patterns of YBa(2)Cu(3)O(7) [100] zone.
- Utilized unfiltered, zero-loss, and plasmon-loss electron beams.
- Performed structure refinement using the MSLS program.
Main Results:
- Atomic positions obtained were not significantly different across filter conditions.
- Structure refinement yielded consistent atomic positions even with amorphous carbon contamination.
- Increased energy-loss electrons (>40 times) did not alter the refined atomic positions.
Conclusions:
- Energy filtering does not offer significant accuracy improvements for structure analysis in PBED.
- The presence of energy-loss electrons does not negatively impact the determination of atomic positions.
- Standard electron diffraction data without energy filtering is sufficient for accurate crystal structure determination.