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Synthesis of diamonds in Fe—C systems using nitrogen and hydrogen co-doped impurities under HPHT |
| Shi-Shuai Sun(孙士帅)1, Zhi-Hui Xu(徐智慧)1, Wen Cui(崔雯)2, Xiao-Peng Jia(贾晓鹏)3, Hong-An Ma(马红安)3 |
1 College of Science, Tianjin University of Technology, Tianjin 300384, China;
2 College of Physics and Materials Science, Tianjin Normal University Tianjin 300387, China;
3 State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China |
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Abstract In this study, we investigate the effect of nitrogen and hydrogen impurities on colors, morphologies, impurity structures and synthesis conditions of diamond crystals in Fe-C systems with C3N6H6 additives at pressures in the range 5.0-6.5 GPa and temperatures of 1400-1700 ℃ in detail. Our results reveal that the octahedron diamond nucleation in a Fe-C system is evidently inhibited by co-doped N-H elements, thereby resulting in the increase of minimum pressure and temperature of diamond synthesis by spontaneous nucleation. The octahedron diamond crystals synthesized from a pure Fe-C system are colorless, while they become green in the system with C3N6H6 additive. The surface defects of diamond will deteriorate when the nitrogen and hydrogen atoms simultaneously incorporate in the diamond growth environment in the Fe-C system. We believe that this study will provide some important information and be beneficial for the deep understanding of the crystallization of diamonds from different component systems.
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Received: 05 May 2017
Revised: 25 May 2017
Accepted manuscript online:
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PACS:
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81.05.ug
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(Diamond)
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81.10.Aj
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(Theory and models of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
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61.72.S-
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(Impurities in crystals)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11504267, 11504269, and 51172089), the Open Project of State Key Laboratory of Superhard Materials, Jilin University, China (Grant No. 201504), and the Doctoral Fund of Tianjin Normal University, China (Grant No. 52XB1518). |
Corresponding Authors:
Shi-Shuai Sun
E-mail: sssdashuai@163.com
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Cite this article:
Shi-Shuai Sun(孙士帅), Zhi-Hui Xu(徐智慧), Wen Cui(崔雯), Xiao-Peng Jia(贾晓鹏), Hong-An Ma(马红安) Synthesis of diamonds in Fe—C systems using nitrogen and hydrogen co-doped impurities under HPHT 2017 Chin. Phys. B 26 098101
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