| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Synthesis of Polycrystalline Diamond Compact with Selenium: Discovery of a New Se–C Compound |
| Wen-Dan Wang1**, Ao Li1, Guo-Heng Xu2, Pei Wang3, Yue-Gao Liu4, Li-Ping Wang3** |
1School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031
2Materials Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000
3Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen 518055
4CAS Key Laboratory for Experimental Study under Deep-Sea Extreme Conditions, Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000
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| Cite this article: |
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Wen-Dan Wang, Ao Li, Guo-Heng Xu et al 2020 Chin. Phys. Lett. 37 058101 |
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Abstract Sintering of polycrystalline diamond with selenium was investigated under pressure of 6.5–10.5 GPa at a constant temperature of 1850 $^{\circ}\!$C. A new carbon-selenium compound with a most plausible chemical formula of SeC and a WC-type hexagonal structure (space group $P\bar{6}m2$) has been discovered in the recovered samples sintered at 10.5 GPa and 1850 $^{\circ}\!$C. Refined lattice parameters are as follows: $a = 2.9277(4)$ Å, $c = 2.8620(4)$ Å, $V = 21.245(4)$ Å$^{3}$. The diamond compacts hot-pressed at 10.5 GPa have excellent mechanical properties with a Vickers hardness of about 68 GPa at a loading force of 19.6 N. Diamond intergrowths observed in these samples may have benefited from the catalytic effects of Se/SeC on the nucleation and crystal growth of diamond.
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Received: 20 February 2020
Published: 25 April 2020
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| PACS: |
81.05.Uw
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81.20.Ev
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(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
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61.66.Fn
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(Inorganic compounds)
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| Fund: Supported by the National Natural Science Foundation of China (Grant No. 51402245), the Fundamental Research Funds for the Central Universities of China (Grant No. 2682016CX062), the China Scholarship Council (Grant No. 201707005071), the Shenzhen Peacock Plan (Grant No. KQTD2016053019134356), and the Guangdong Innovative & Entrepreneurial Research Team Program (Grant No. 2016ZT06C279). HPCAT operations are supported by US DOE/NNSA under Award No. DE-NA0001974 and DOE-BES under Award No. DE-FG02-99ER45775, with partial instrumentation funding by NSF. APS is supported by DOE-BES under Contract No. DE-AC02-06CH11357. |
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