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Point defects and interstitial climb of 90° partial dislocations in brown type IIa natural diamond
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Laidlaw, Fraser, Beanland, Richard, Fisher, David and Diggle, Phil L. (2020) Point defects and interstitial climb of 90° partial dislocations in brown type IIa natural diamond. Acta Materialia, 201 . pp. 494-503. doi:10.1016/j.actamat.2020.10.033 ISSN 1359-6454.
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Official URL: http://dx.doi.org/10.1016/j.actamat.2020.10.033
Abstract
Multiple electron microscopy techniques have been used to study a brown type IIa natural diamond. Electron backscatter diffraction shows evidence of plastic deformation in the form of slip bands, while cathodoluminescence reveals a network of low-angle grain boundaries, also observed in transmission electron microscopy together with long straight dislocations and dislocation dipoles. Aberration-corrected scanning transmission electron microscopy shows interstitial absorption on the 90° partial of both dissociated dislocations and Z-type faulted vacancy dipoles, forming structures similar to that observed in other fcc materials. The observations indicate an interstitial concentration of 1017 to 1019 cm-3 and calculations of point defect concentrations produced by plastic deformation show that this can be produced by strains of the order of 1%. Brown coloration in diamond has been previously attributed to vacancies and vacancy clusters with concentrations around 1018 cm-3, which suggests that roughly equal numbers of interstitials and vacancies are generated in diamond via plastic deformation. Atomic resolution images of Z-type faulted dipoles allow a stacking fault energy of 472 ± 38 mJ m-2 to be determined.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) T Technology > TN Mining engineering. Metallurgy |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Diamonds, Point defects, Deformations (Mechanics), Electron microscopy , Electrons -- Backscattering | ||||||||
Journal or Publication Title: | Acta Materialia | ||||||||
Publisher: | Elsevier Ltd | ||||||||
ISSN: | 1359-6454 | ||||||||
Official Date: | December 2020 | ||||||||
Dates: |
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Volume: | 201 | ||||||||
Page Range: | pp. 494-503 | ||||||||
DOI: | 10.1016/j.actamat.2020.10.033 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||
Date of first compliant deposit: | 27 October 2020 | ||||||||
Date of first compliant Open Access: | 8 July 2021 |
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