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Regulation mechanism of catalyst structure on diamond crystal morphology under HPHT process |
| Ya-Dong Li(李亚东)1, Yong-Shan Cheng(程永珊)1, Meng-Jie Su(宿梦洁)1, Qi-Fu Ran(冉启甫)1, Chun-Xiao Wang(王春晓)2, Hong-An Ma(马红安)2, Chao Fang(房超)3, Liang-Chao Chen(陈良超)3 |
1 College of Electronical Information Engineering, Yangtze Normal University, Chongqing 408100, China;
2 State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;
3 Key Laboratory of Material Physics of Ministry of Education, School of Physical Engineering, Zhengzhou University, Zhengzhou 450052, China |
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Abstract To elucidate the regulation mechanism of catalyst geometry structure to diamond growth, we establish three catalyst modes with different structures. The simulation results show that with the decrease of the protruding height of the catalyst, the low-temperature region gradually moves toward the center of the catalyst, which causes the distribution characteristics of the temperature and convection field in the catalyst to change. The temperature difference in vertical direction of the catalyst decreases gradually and increases in the horizontal direction, while the catalyst convection velocity has the same variation regularity in the corresponding directions. The variation of temperature difference and convection velocity lead the crystal growth rate in different crystal orientations to change, which directly affects the crystal morphology of the synthetic diamond. The simulation results are consistent with the experimental results, which shows the correctness of the theoretical rational analysis. This work is expected to be able to facilitate the understanding of catalyst structure regulation mechanism on diamond morphology and the providing of an important theoretical basis for the controllable growth of special crystal shape diamond under HPHT process.
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Received: 25 March 2020
Revised: 27 April 2020
Accepted manuscript online:
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PACS:
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81.05.ug
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(Diamond)
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07.35.+k
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(High-pressure apparatus; shock tubes; diamond anvil cells)
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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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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11804305), the Natural Science Foundation of Chongqing, China (Grant No. cstc2019jcyj-msxmX0391), the Science and Technology Research Program of Chongqing Municipal Education Commission, China (Grant No. KJ201901405), and the Open Project of State Key Laboratory of Superhard Materials, Jilin University, China (Grant No. 201912). |
Corresponding Authors:
Liang-Chao Chen
E-mail: yznu_lyd@163.com
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Cite this article:
Ya-Dong Li(李亚东), Yong-Shan Cheng(程永珊), Meng-Jie Su(宿梦洁), Qi-Fu Ran(冉启甫), Chun-Xiao Wang(王春晓), Hong-An Ma(马红安), Chao Fang(房超), Liang-Chao Chen(陈良超) Regulation mechanism of catalyst structure on diamond crystal morphology under HPHT process 2020 Chin. Phys. B 29 078101
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