2026-10-12T22:01:58Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33821521 2026-09-15T20:13:07Z portal_1197 item_type_3 month_year_09_2026

Data for Spatial distribution of defects in a plastically deformed natural brown diamond Fraser Laidlaw (24456791) Phil L. Diggle (24934606) Ben Breeze (12369596) Matthew W. Dale (24813520) D. Fisher (3577943) Richard Beanland (768962) Diamonds Deformations (Mechanics) Point defects Crystals -- Defects -- Research Microscopy Migrated from ePrints 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.<br><br>Data for "Spatial distribution of defects in plastically deformed natural brown diamond" Dataset split into labelled folders: Treated Sample CL 1 - "01 VPSE SEM A628-09-02-b Survey 200us pxtime_30kV.dm4" - Panchromatic CL image formed using VPSE detector, pixel time of 200us used and accelerating voltage of 30kV, liquid nitrogen temps. Acquired in Digital Micrograph 4 format, -.dm4. Additional meta-data can be found in file. 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, 0.5s dwell time per wavelength, 30 kV accel voltage Acquired in Digital Micrograph 4 format, -.dm4. Additional meta-data can be found in file. 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, 0.5s dwell time per wavelength, 30 kV accel voltage Acquired in Digital Micrograph 4 format, -.dm4. Additional meta-data can be found in file. 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 10 - "07 A628-09-02-b 200kV x2000 DF2-20 SurveyB.dm3" - Accelerating voltage of 200kV due to thicker sample. Imaged using the Dark Field 2-20 condition. 11 - "07 A628-09-02-b 200kV x2000 DF2-20 SurveyC.dm3"- Acquired in Digital Micrograph 4 format, -.dm4. Additional meta-data can be found in file. 12 - "07 A628-09-02-b 200kV x2000 DF2-20 SurveyD.dm3" 13 - "07 A628-09-02-b 200kV x2000 DF2-20 SurveyE.dm3" 14 - "07 A628-09-02-b 200kV x2000 DF2-20 SurveyF.dm3" Untreated Sample CL 15 - "01 VPSE a628-09-02-b Survey 300us pxtime_5kV.dm4" - Panchromatic CL image formed using VPSE detector, pixel time of 300us used and accelerating voltage of 5kV, liqiud nitrogen temps. Acquired in Digital Micrograph 4 format, -.dm4. Additional meta-data can be found in file. 16 - "03 Spectrum A628-09-07 BRIGHTB MAG x229 DWELL2S_1nmStep_0p37mm_1502HT_-130C_20kV.dm4" - CL spectrum of bright band, 1nm spectral resolution, 2s dwell time per wavelength, 20 kV accel voltage, Sample temperature -130degC. Acquired in Digital Micrograph 4 format, -.dm4. Additional meta-data can be found in file. 17 - "03 Spectrum A628-09-07 DARKB MAG x229 DWELL2S_1nmStep_0p37mm_1502HT_-130C_20kV.dm4" - CL spectrum of dark band, 1nm spectral resolution, 2s dwell time per wavelength, 20 kV accel voltage, Sample temperature -130degC Acquired in Digital Micrograph 4 format, -.dm4. Additional meta-data can be found in file. 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. 25 - "20a_A628-09-06_DFWBg2g_1-5kX.dm3"- Imaged using the 220 g2g weak beam condition 26 - "20b_A628-09-06_DFWBg2g_1-5kX.dm3" - Acquired in Digital Micrograph 4 format, -.dm4. Meta-data can be found in file. 27 - "20c_A628-09-06_DFWBg2g_1-5kX.dm3" 28 - "20d_A628-09-06_DFWBg2g_1-5kX.dm3" 2021-05-27T00:00:00Z Dataset Dataset 10.82444/warw.33821521.v1 https://figshare.com/articles/dataset/Data_for_Spatial_distribution_of_defects_in_a_plastically_deformed_natural_brown_diamond/33821521 CC BY 4.0