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Spatial distribution of defects in a plastically deformed natural brown diamond
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Laidlaw, Fraser, Diggle, Phil L., Breeze, Ben, Dale, Matthew W., Fisher, David and Beanland, Richard (2021) Spatial distribution of defects in a plastically deformed natural brown diamond. Diamond and Related Materials, 117 . 108465. doi:10.1016/j.diamond.2021.108465 ISSN 0925-9635.
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WRAP-spatial-distribution-defects-plastically-deformed-natural-brown-diamond-Laidlaw-2021.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (2087Kb) | Preview |
Official URL: https://doi.org/10.1016/j.diamond.2021.108465
Abstract
Photoluminescence, Raman mapping, cathodoluminescence and transmission electron microscopy (TEM) have been carried out on a “zebra” diamond, containing both brown and colourless bands. The stone was cut into two and one part was given high-pressure high temperature (HPHT) treatment, removing the brown colouration. The parts were then cut into (110) sections. In the untreated stone the morphology of brown stripes is consistent with that of slip bands formed during plastic deformation and Raman mapping shows they are under strong compressive stress. Photoluminescence from N3 and H3 centres, as well as lines at 406.3 nm, 491.3 nm and 535.9 nm, are correlated with brown bands in the untreated sample, while cathodoluminescence shows that band-A luminescence is anticorrelated. HPHT treatment reduces internal stress, and eliminates or reduces correlated luminescence. TEM reveals long straight dislocations and dislocation dipoles in the brown bands, consistent with deformation by slip and concurrent intrinsic point defect production, while clear bands have curved and tangled dislocation networks. We postulate that vacancies produced by plastic deformation aggregate into clusters responsible both for the brown colouration and an increase in volume that results in compressive stress. The 535.9 nm line has characteristics of an interstitial-type defect and may be formed by the trapping of interstitials generated during plastic deformation.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QE Geology Q Science > QH Natural history T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Diamonds, Deformations (Mechanics), Point defects, Crystals -- Defects -- Research, Microscopy | |||||||||
| Journal or Publication Title: | Diamond and Related Materials | |||||||||
| Publisher: | Elsevier S.A. | |||||||||
| ISSN: | 0925-9635 | |||||||||
| Official Date: | August 2021 | |||||||||
| Dates: |
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| Volume: | 117 | |||||||||
| Article Number: | 108465 | |||||||||
| DOI: | 10.1016/j.diamond.2021.108465 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||
| Date of first compliant deposit: | 21 May 2021 | |||||||||
| Date of first compliant Open Access: | 4 June 2021 | |||||||||
| RIOXX Funder/Project Grant: |
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