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Structural refinement of single crystals using digital-large angle convergent beam electron diffraction patterns
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Hubert, A. J. M. (2019) Structural refinement of single crystals using digital-large angle convergent beam electron diffraction patterns. PhD thesis, University of Warwick.
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WRAP_Theses_Hubert_2019.pdf - Submitted Version - Requires a PDF viewer. Download (38Mb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b3517889
Abstract
We explore the capability of digital-large angle convergent beam electron diffraction (D-LACBED) data for the structural refinement of single crystals. To achieve this, we use three materials as test cases. We use corundum for atomic position refinement, copper and gallium arsenide for Debye-Waller factor (DWF) refinement. D-LACBED patterns are found to be extremely sensitive to atomic position, within 0.4 pm of reference X-ray values. The patterns are less sensitive to DWF (using the independent atom model - IAM) but nonetheless give good agreement to X-ray and M�ossbauer radiation values for copper. We find the IAM to be insufficient for accurate refinement of gallium arsenide due to the influence of previously suggested strong anharmonicity and bonding within the material. Finally, we use simulation to explore the sensitivity of D-LACBED patterns through most refineable structural parameters, providing context to the aforementioned results. During the analysis we see that higher g-vector patterns within the D-LACBED data may be more sensitive to structural parameters in general.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QC Physics | ||||
Library of Congress Subject Headings (LCSH): | Electrons -- Diffraction, Transmission electron microscopy, Crystals -- Structure | ||||
Official Date: | July 2019 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Physics | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Beanland, R. | ||||
Format of File: | |||||
Extent: | xvi, 161 leaves : illustrations | ||||
Language: | eng |
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