Effects of Al and Ti/Cu on Synthesis of Type-IIa Diamond Crystals in Ni70Mn25Co5-C System at HPHT |
| |
| Authors: | LI Shang-Sheng JIA Xiao-Peng ZANG Chuan-Yi TIAN Yu ZHANG Ya-Fei XIAO Hong-Yu HUANG Guo-Feng MA Li-Qiu LI Yong LI Xiao-Lei MA Hong-An |
| |
| Affiliation: | Key National Laboratory of Superhard Materials, Jilin University, Changchun 130012Institute of Material Science and Engineering, Henan Polytechnic University, Jiaozuo 454000 |
| |
| Abstract: | High-quality type-IIa gem diamond crystals are successfully synthesized in a Ni70Mn25Co5-C system by temperature gradient method (TGM) at about 5.5GPa and 1560K. Al and Ti/Cu are used as nitrogen getters respectively. While nitrogen getter Al or Ti/Cu is added into the synthesis system, some inclusions and caves tend to be introduced into the crystals. When Al is added into the solvent alloy, we would hardly gain high-quality type-IIa diamond crystals with nitrogen concentration Nc< 1ppm because of the reversible reaction of Al and N at high pressure and high temperature (HPHT). However, when Ti/Cu is added into the solvent alloy, high-quality type-IIa diamond crystals with Nc < 1ppm can be grown by decreasing the growth rate of diamonds. |
| |
| Keywords: | 81.05.Uw 81.10.Aj 81.10.Dn 81.10.-h |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《中国物理快报》浏览原始摘要信息 |
|
点击此处可从《中国物理快报》下载免费的PDF全文 |
|
