Synthesis of large diamond crystals with C3H8N4O2 as organic additive under HPHT conditions |
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| Affiliation: | 1. State Key Lab 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, Henan, China;1. Faculty of Engineering, China University of Geosciences, Wuhan, Hubei 430074, China;2. Guilin Diamond Industry Co.,Ltd., Guilin, Guangxi 541199, China;1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;2. Industry and Equipment Technology Institute of HFUT, Hefei University of Technology, Hefei 230009, China;3. International Joint Laboratory for Light Alloys (Ministry of Education), College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;4. China International S&T Cooperation Base for Advanced Energy and Environmental Materials, Hefei 230009, China;5. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xian Jiaotong University, Xian, Shanxi 710049, China;6. Institut für Energie und Klimaforschung-Plasmaphysik, Forschungszentrum Jülich GmbH, Jülich 52425, Germany;1. School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China;2. Key Laboratory of Equipments Manufacturing and Intelligent Measurement and Control, China National Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China;1. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China;2. National International Joint Research Center of Deep Geodrilling Equipment, China University of Geosciences (Beijing), Beijing 100083, PR China;1. School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China;2. Key Laboratory of Advanced Manufacturing and Measurement and Control Technology for Light Industry in Universities of Shandong, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China |
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| Abstract: | Diamond crystals were successfully synthesized in a NiMnCo-C system by adding Malonic acid dihydrazide (C3H8N4O2) as an organic additive. The synthesized conditions in a series of experiments were about at 1300 °C–1400 °C and 6.0 GPa–7.0 GPa. The color, morphology, and inclusions of the synthetic diamond crystals were characterized by optical microscopy, Fourier transform infrared (FTIR) spectroscope and Raman spectroscope, respectively. The color of the synthesized diamonds changes from light yellow to green with increasing amounts of C3H8N4O2. The morphology of the synthesized diamonds exhibited triangular shape with abundant {111} faces. The FTIR spectra indicated that the nitrogen concentration increased whereas the hydrogen and oxygen concentration decreased with increasing concentration of the C3H8N4O2 additive. The Raman peak positions exhibited a systematic downshift with increasing amounts of C3H8N4O2 additive. According to the synthesized resultant, with increased the content of the C3H8N4O2 additive, the quality of synthesized diamond gets worse. It is interesting that the diamond content more nitrogen and less hydrogen and oxygen with increasing the C3H8N4O2 additive. By studying the effects of nitrogen, hydrogen and oxygen coexistence on the synthesis of diamond, it is would to speculate that the natural diamond nucleation and growth environment may be content more nitrogen source and less hydrogen and oxygen. |
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