Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds
BACKGROUND Overgrowth diamond refers to the product of thick CVD synthetic diamond layer grown on a natural diamond with the whole appearance. Since overgrown diamonds contain information on the nitrogen impurities of natural diamonds, traditional synthetic diamond screening methods and testing proc...
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| Format: | Article |
| Language: | English |
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Science Press, PR China
2019-01-01
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| Series: | Yankuang ceshi |
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| Online Access: | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201802070017 |
| _version_ | 1797953799690649600 |
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| author | TANG Shi SU Jun LU Tai-jin MA Yong-wang KE Jie SONG Zhong-hua ZHANG Jun ZHANG Xiao-yu DAI Hui-ru LI Hai-bo ZHANG Jian WU Xu-xu LIU Hou-xiang |
| author_facet | TANG Shi SU Jun LU Tai-jin MA Yong-wang KE Jie SONG Zhong-hua ZHANG Jun ZHANG Xiao-yu DAI Hui-ru LI Hai-bo ZHANG Jian WU Xu-xu LIU Hou-xiang |
| author_sort | TANG Shi |
| collection | DOAJ |
| description | BACKGROUND Overgrowth diamond refers to the product of thick CVD synthetic diamond layer grown on a natural diamond with the whole appearance. Since overgrown diamonds contain information on the nitrogen impurities of natural diamonds, traditional synthetic diamond screening methods and testing procedures are no longer applicable to the detection of overgrown diamonds. OBJECTIVE To gemologically test an overgrowth diamond sample in order to investigate the full identification features and to propose the optimum detection strategy. METHODS Minspecting, screening instruments testing, UV-Vis/FTIR/PL spectra examinations, as well as fluorescence and phosphorescence observation under deep UV excitation are carried out. RESULTS The sample cannot be identified by traditional microscopic observation, diamond instrument screening, and infrared spectra measurement. The sample has a distinct boundary that is separated by different luminescence under DiamondViewTM. The upper layer displays red fluorescence and greenish blue phosphorescence, while the lower layer shows deep blue fluorescence and no phosphorescence. Infrared spectroscopic analysis shows that the upper layer is type Ⅱa and the lower layer is type Ⅰa diamond. The UV-Vis absorption and photoluminescence spectra confirmed the coexistence of N3 centers and a high level of[Si-V]- defects in the diamond. CONCLUSIONS It was confirmed that the lower part of the sample is natural and the upper part of the sample is CVD synthetic layer with a thickness around 740μm. The first overgrowth diamond reported domestically was compared to the same type of samples reported abroad. The existence of a boundary are missing and the thickness of the CVD layer increased significantly in this sample. The innovative application of the multidirectional luminescence imaging and spectroscopic analyses is the key to laboratory testing of overgrowth diamond. |
| first_indexed | 2024-04-10T23:07:49Z |
| format | Article |
| id | doaj.art-5f6dddf3363d491382c2d245ed3f7b63 |
| institution | Directory Open Access Journal |
| issn | 0254-5357 |
| language | English |
| last_indexed | 2024-04-10T23:07:49Z |
| publishDate | 2019-01-01 |
| publisher | Science Press, PR China |
| record_format | Article |
| series | Yankuang ceshi |
| spelling | doaj.art-5f6dddf3363d491382c2d245ed3f7b632023-01-13T10:08:24ZengScience Press, PR ChinaYankuang ceshi0254-53572019-01-01381627010.15898/j.cnki.11-2131/td.201802070017ykcs-38-1-62Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth DiamondsTANG Shi0SU Jun1LU Tai-jin2MA Yong-wang3KE Jie4SONG Zhong-hua5ZHANG Jun6ZHANG Xiao-yu7DAI Hui-ru8LI Hai-bo9ZHANG Jian10WU Xu-xu11LIU Hou-xiang12National Gemstone Testing Center, Beijing 100013, ChinaNational Gemstone Testing Center, Beijing 100013, ChinaResearch Institute of Beijing, National Gems & Jewelry Technology Administrative Center, Ministry of Natural Resources, Beijing 100013, ChinaNational Gemstone Testing Center, Beijing 100013, ChinaNational Gemstone Testing Center, Beijing 100013, ChinaNational Gemstone Testing Center, Shenyang 110013, ChinaNational Gemstone Testing Center, Beijing 100013, ChinaNational Gemstone Testing Center, Beijing 100013, ChinaNational Gemstone Testing Center, Beijing 100013, ChinaNational Gemstone Testing Center, Beijing 100013, ChinaResearch Institute of Beijing, National Gems & Jewelry Technology Administrative Center, Ministry of Natural Resources, Beijing 100013, ChinaResearch Institute of Beijing, National Gems & Jewelry Technology Administrative Center, Ministry of Natural Resources, Beijing 100013, ChinaNational Gemstone Testing Center, Shanghai 200122, ChinaBACKGROUND Overgrowth diamond refers to the product of thick CVD synthetic diamond layer grown on a natural diamond with the whole appearance. Since overgrown diamonds contain information on the nitrogen impurities of natural diamonds, traditional synthetic diamond screening methods and testing procedures are no longer applicable to the detection of overgrown diamonds. OBJECTIVE To gemologically test an overgrowth diamond sample in order to investigate the full identification features and to propose the optimum detection strategy. METHODS Minspecting, screening instruments testing, UV-Vis/FTIR/PL spectra examinations, as well as fluorescence and phosphorescence observation under deep UV excitation are carried out. RESULTS The sample cannot be identified by traditional microscopic observation, diamond instrument screening, and infrared spectra measurement. The sample has a distinct boundary that is separated by different luminescence under DiamondViewTM. The upper layer displays red fluorescence and greenish blue phosphorescence, while the lower layer shows deep blue fluorescence and no phosphorescence. Infrared spectroscopic analysis shows that the upper layer is type Ⅱa and the lower layer is type Ⅰa diamond. The UV-Vis absorption and photoluminescence spectra confirmed the coexistence of N3 centers and a high level of[Si-V]- defects in the diamond. CONCLUSIONS It was confirmed that the lower part of the sample is natural and the upper part of the sample is CVD synthetic layer with a thickness around 740μm. The first overgrowth diamond reported domestically was compared to the same type of samples reported abroad. The existence of a boundary are missing and the thickness of the CVD layer increased significantly in this sample. The innovative application of the multidirectional luminescence imaging and spectroscopic analyses is the key to laboratory testing of overgrowth diamond.http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201802070017overgrowth diamondcvd synthetic diamondspectroscopic testingluminescence imaging |
| spellingShingle | TANG Shi SU Jun LU Tai-jin MA Yong-wang KE Jie SONG Zhong-hua ZHANG Jun ZHANG Xiao-yu DAI Hui-ru LI Hai-bo ZHANG Jian WU Xu-xu LIU Hou-xiang Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds Yankuang ceshi overgrowth diamond cvd synthetic diamond spectroscopic testing luminescence imaging |
| title | Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds |
| title_full | Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds |
| title_fullStr | Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds |
| title_full_unstemmed | Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds |
| title_short | Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds |
| title_sort | research on laboratory testing features of chemical vapor deposition in overgrowth diamonds |
| topic | overgrowth diamond cvd synthetic diamond spectroscopic testing luminescence imaging |
| url | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201802070017 |
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