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 ##IMG## [http://ej.iop.org/images/0256-307X/37/5/058101/cpl_37_5_058101_ieqn1.gif] {$P\bar{6}m2$} ) 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) 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.

中文翻译：

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硒合成多晶金刚石复合片：发现一种新的硒化碳化合物

在6.5-10.5 GPa的压力下，在1850°C的恒定温度下研究了多晶金刚石与硒的烧结。一种新的碳硒化合物，具有最合理的化学式SeC和WC型六角结构（空间群## IMG ## [http://ej.iop.org/images/0256-307X/37/5/ 058101 / cpl_37_5_058101_ieqn1.gif] {$ P \ bar {6} m2 $}）已发现于10.5 GPa和1850°C烧结的回收样品中。精确的晶格参数如下：a = 2.9277（4）Å，c = 2.8620（4）Å，V = 21.245（4）Å3。热压为10.5 GPa的金刚石压块具有出色的机械性能，在19.6 N的加载力下维氏硬度约为68 GPa。在这些样品中观察到的金刚石共生可能受益于Se / SeC对成核和成核的催化作用。钻石的晶体生长。