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Data for 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, D. and Beanland, Richard (2021) Data for Spatial distribution of defects in a plastically deformed natural brown diamond. [Dataset]
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Official URL: http://wrap.warwick.ac.uk/150606/
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: | Dataset | |||||||||
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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 | |||||||||
| Type of Data: | Experimental data | |||||||||
| Library of Congress Subject Headings (LCSH): | Diamonds, Deformations (Mechanics), Point defects, Crystals -- Defects -- Research, Microscopy | |||||||||
| Publisher: | University of Warwick, Department of Physics | |||||||||
| Official Date: | 27 May 2021 | |||||||||
| Dates: |
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| Status: | Not Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Media of Output (format): | .tif .dm4 .wxd .l6m .dm3 .wdf | |||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||
| Copyright Holders: | University of Warwick | |||||||||
| Description: | Data for "Spatial distribution of defects in plastically deformed natural brown diamond" Dataset split into labelled folders: Treated Sample CL 2 - "02 Spectrum Bright Band A628-09-02-b 0_5s dwell_1nmStep_0p37mm_1502HT_30kV.dm4" - CL spectrum of bright band, 1nm spectral resolution, 3 - "02 Spectrum Dark Band A628-09-02-b 0_5s dwell_1nmStep_0p37mm_1502HT_30kV.dm4" - CL spectrum of dark band, 1nm spectral resolution, Treated Sample OptBir Images 4 - "A628-09-02-b Optical Image ch00.tif" - White light optical image of treated sample. Image format .tif 5 - "A628-09-02-b Bir Image ch01.tif" - Birefringence image of treated sample using cross polarisers. Image format .tif Treated Sample PL 6 - "A628-09-02-9_325.wxd" - PL map using 325nm laser excitation. Step Size of 7.5um. Liquid nitrogen temperatures. Meta-data can be found in file. Renishaw WiRe software - file format -.wxd 7 - "a628-09-02-9_488nm_01.l6m" - PL map using 488nm laser excitation. Step Size of 5um. Liquid nitrogen temperatures. Meta-data can be found in file. Horiba Labspec6 software - file format .l6m Treated Sample Raman 8 - "628-09-02-9_660Raman_01.l6m" - Map of Raman line using 660nm laser excitation. Step Size of 2um. Liqiud nitrogen temepratures. Meta-data can be found in file. Horiba Labspec6 software - file format .l6m Treated Sample TEM 9 - "07 A628-09-02-b 200kV x2000 DF2-20 SurveyA.dm3" - Weak beam dark field images of dislocation structures. Magnification of x2000 Untreated Sample CL 16 - "03 Spectrum A628-09-07 BRIGHTB MAG x229 DWELL2S_1nmStep_0p37mm_1502HT_-130C_20kV.dm4" - CL spectrum of bright band, 1nm spectral resolution, 17 - "03 Spectrum A628-09-07 DARKB MAG x229 DWELL2S_1nmStep_0p37mm_1502HT_-130C_20kV.dm4" - CL spectrum of dark band, 1nm spectral resolution, Untreated Sample OptBir Images 18 - "A628-09-07-a001.xlef_Series001_ch00.tif" - White light optical image of treated sample. Image format ".tif" 19 - "A628-09-07-a001.xlef_Series001_ch01.tif" - Birefringence image of treated sample using cross polarisers. Image format ".tif" Untreated Sample PL 20 - "A628-09-07_Map_500x500_5umstep_325nm.wdf" - PL map using 325nm laser excitation. Step Size of 7.5um. Liquid nitrogen temperatures. Meta-data can be found in file. File format -.wdf, Renishaw WiRE software 21 - "a628-09-07_488nm_02.l6m" - PL map using 488nm laser excitation. Step Size of 5um. Liquid nitrogen temperatures. Meta-data can be found in file. Horiba Labspec6 software - file format .l6m Untreated Sample Raman 22 - "628-09-07_offcuts_660Raman_01.l6m" - Map of Raman line using 660nm laser excitation. Step Size of 2um. Liquid nitrogen temperatures. Meta-data can be found in file. Horiba Labspec6 software - file format .l6m Untreated Sample TEM 23 - "06_A628-09-06_DFWBg2g220_4kX.dm3" - Weak beam dark field images of dislocation dipoles using a 220 g2g weak beam diffraction condition. Magnification of x4000 - Accelerating voltage of 80kV. Imaged using the 220 g2g condition. Acquired in Digital Micrograph 4 format, -.dm4. Meta-data can be found in file. 24 - "20_A628-09-06_DFWBg2g_1-5kX.dm3" - Low magnification weak beam dark field images of dislocation structures. Magnification of x1500 - Accelerating voltage of 80kV. |
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| Date of first compliant deposit: | 27 May 2021 | |||||||||
| Date of first compliant Open Access: | 27 May 2021 | |||||||||
| RIOXX Funder/Project Grant: |
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