,Synthesis of Polycrystalline Diamond Compact with Selenium: Discovery of a New Se-C Compound

• 作 者: Wen-Dan Wang Ao Li Guo-Heng Xu Pei Wang Yue-Gao Liu Li-Ping Wang
• 机 构: School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031“,”Materials
• 出 处: 中国物理快报（英文版）
• 发表日期: 2020年5期

Sintering of polycrystalline diamond with selenium was investigated under pressure of 6.5-10.5 GPa at a constant temperature of 1850℃.A new carbon-selenium compound with a most plausible chemical formula of SeC and a WC-type hexagonal structure (space group P(6)m2) has been discovered in the recovered samples sintered at 10.5GPa and 1850℃.Refined lattice parameters are as follows: a =2.9277(4)(A),c =2.8620(4)(A),V =21.245(4) (A)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.