Synthesis of Polycrystalline Diamond Compact with Selenium: Discovery of a New Se-C Compound
Abstract
Sintering of polycrystalline diamond with selenium was investigated under pressure of 6.5-10.5 GPa at a constant temperature of 1850 °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 °C. Refined lattice parameters are as follows: a = 2.9277(4) Å, c = 2.8620(4) Å, V = 21.245(4) Å3. 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. *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.
- Publication:
-
Chinese Physics Letters
- Pub Date:
- May 2020
- DOI:
- 10.1088/0256-307X/37/5/058101
- Bibcode:
- 2020ChPhL..37e8101W
- Keywords:
-
- 81.05.Uw;
- 81.20.Ev;
- 61.66.Fn