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A new electron diffraction approach for structure refinement applied to Ca3Mn2O7
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Beanland, Richard, Smith, Kerrie, Vanek, Premsyl, Zhang, Huairuo, Hubert, Alex, Evans, Keith, Roemer, Rudolf A. and Kamba, Stanislav (2021) A new electron diffraction approach for structure refinement applied to Ca3Mn2O7. Acta Crystallographica Section A Foundations and Advances, A77 (3). pp. 196-207. doi:10.1107/S2053273321001546 ISSN 2053-2733.
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Official URL: https://doi.org/10.1107/S2053273321001546
Abstract
The digital large-angle convergent-beam electron diffraction (D-LACBED) technique is applied to Ca3Mn2O7 for a range of temperatures. Bloch-wave simulations are used to examine the effects that changes in different parameters have on the intensity in D-LACBED patterns, and atomic coordinates, thermal atomic displacement parameters and apparent occupancy are refined to achieve a good fit between simulation and experiment. The sensitivity of the technique to subtle changes in structure is demonstrated. Refined structures are in good agreement with previous determinations of Ca3Mn2O7 and show the decay of anti-phase oxygen octahedral tilts perpendicular to the c axis of the A21am unit cell with increasing temperature, as well as the robustness of oxygen octahedral tilts about the c axis up to ∼400°C. The technique samples only the zero-order Laue zone and is therefore insensitive to atom displacements along the electron-beam direction. For this reason it is not possible to distinguish between in-phase and anti-phase oxygen octahedral tilting about the c axis using the [110] data collected in this study.
Item Type: | Journal Article | |||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
Library of Congress Subject Headings (LCSH): | Crystallography, Electrons -- Diffraction, Electron microscopy -- Technique | |||||||||
Journal or Publication Title: | Acta Crystallographica Section A Foundations and Advances | |||||||||
Publisher: | Wiley | |||||||||
ISSN: | 2053-2733 | |||||||||
Official Date: | 1 May 2021 | |||||||||
Dates: |
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Volume: | A77 | |||||||||
Number: | 3 | |||||||||
Page Range: | pp. 196-207 | |||||||||
DOI: | 10.1107/S2053273321001546 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||
Date of first compliant deposit: | 25 May 2021 | |||||||||
Date of first compliant Open Access: | 25 May 2021 | |||||||||
RIOXX Funder/Project Grant: |
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