Synthesis and characterization of gem diamond single crystals in Fe-C system under high temperature and high pressure

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作者：
Wang, Zhanke [1 ]
Ma, Hongan [1 ]
Fang, Shuai [1 ]
Yang, Zhiqiang [1 ]
Miao, Xinyuan [1 ]
Chen, Liangchao [2 ]
Jia, Xiaopeng [1 ]
机构：
[1] State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun,130012, China
[2] Key Laboratory of Material Physics of Ministry of Education, School of Physical Engineering, Zhengzhou University, Zhengzhou,450052, China
来源：
Journal of Crystal Growth | 2020年 / 531卷
关键词：
In this paper; the diamond large single crystals were successfully synthesized in the pure Fe-C system by temperature gradient growth (TGG) method in China-type cubic anvil high-pressure apparatus (CHPA) at 5.8 GPa and 1550 °C. The synthesized diamonds were characterized by Optical microscopy; Infrared spectroscopy; Raman spectroscopy and Photoluminescence (PL) spectroscopy. The results show that the nitrogen concentration of type Ib diamonds synthesized in pure Fe-C system is about 80 ppm; which is much lower than diamonds synthesized by Ni-based and Fe-based alloys. PL spectra result indicated that there were no peaks related to the NV centers in diamonds synthesized by Fe-C system. In addition; high-quality type IIa gem diamond can be synthesized by adding a small amount of nitrogen getter in the pure Fe-C system. We believe that this work is of great significance for the synthesis of high-purity large single type IIa diamonds without impurities such as nitrogen and metals. © 2019 Elsevier B.V;
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