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Different effect of NiMnCo or FeNiCo on the growth of type-IIa large diamonds with Ti/Cu as nitrogen getter |
| Shang-Sheng Li(李尚升)11, He Zhang(张贺)1, Tai-Chao Su(宿太超)1, Qiang Hu(胡强)1, Mei-Hua Hu(胡美华)1, Chun-Sheng Gong(龚春生)2, Hon-An Ma(马红安)2, Xiao-Peng Jia(贾晓鹏)3, Yong Li(李勇)4 |
1 School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;
2 State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China;
3 School of Data Science, Tongren University, Tongren 554300, China;
4 Department of Mathematics and Physics, Luoyang Institute of Science and Technology, Luoyang 471023, China |
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Abstract In order to synthesize high-quality type-IIa large diamond, the selection of catalyst is very important, in addition to the nitrogen getter. In this paper, type-IIa large diamonds are grown under high pressure and high temperature (HPHT) by using the temperature gradient method (TGM), with adopting Ti/Cu as the nitrogen getter in Ni70Mn25Co5 (abbreviated as NiMnCo) or Fe55Ni29Co16 (abbreviated FeNiCo) catalyst. The values of nitrogen concentration (Nc) in both synthesized high-quality diamonds are less than 1 ppm, when Ti/Cu (1.6 wt%) is added in the FeNiCo or Ti/Cu (1.8 wt%) is added in the NiMnCo. The difference in solubility of nitrogen between both catalysts at HPHT is the basic reason for the different effect of Ti/Cu on eliminating nitrogen. The nitrogen-removal efficiency of Ti/Cu in the NiMnCo catalyst is less than in the FeNiCo catalyst. Additionally, a high-quality type-IIa large diamond size of 5.0 mm is obtained by reducing the growth rate and keeping the nitrogen concentration of the diamond to be less than 1 ppm, when Ti/Cu (1.6 wt%) is added in the FeNiCo catalyst.
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Received: 17 January 2017
Revised: 14 March 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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81.05.Bx
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(Metals, semimetals, and alloys)
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07.35.+k
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(High-pressure apparatus; shock tubes; diamond anvil cells)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11604246), the China Postdoctoral Science Foundation (Grant No. 2016M592714), the Professional Practice Demonstration Base for Professional Degree Graduate in Material Engineering of Henan Polytechnic University, China (Grant No. 2016YJD03), the Funds from the Education Department of Henan Province, China (Grant Nos. 12A430010 and 17A430020), and the Project for Key Science and Technology Research of Henan Province, China (Grant No. 162102210275). |
Corresponding Authors:
Shang-Sheng Li
E-mail: lishsh@hpu.edu.cn
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Cite this article:
Shang-Sheng Li(李尚升), He Zhang(张贺), Tai-Chao Su(宿太超), Qiang Hu(胡强), Mei-Hua Hu(胡美华), Chun-Sheng Gong(龚春生), Hon-An Ma(马红安), Xiao-Peng Jia(贾晓鹏), Yong Li(李勇) Different effect of NiMnCo or FeNiCo on the growth of type-IIa large diamonds with Ti/Cu as nitrogen getter 2017 Chin. Phys. B 26 068102
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