Studying the effect of hydrogen on diamond growth by adding C10H10Fe under high pressures and high temperatures |
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| Authors: | Chao Fang Xiaopeng Jia Shishuai Sun Bingmin Yan Yadong Li Ning Chen |
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| Institution: | 1. State Key Laboratory of Superhard Materials, Jilin University, Changchun, People's Republic of China;2. College of Science, Tianjin University of Technology, Tianjin, People's Republic of China;3. Center for High Pressure Science &4. Technology Advanced Research, Changchun, People's Republic of China |
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| Abstract: | In this paper, hydrogen-doped industrial diamonds and gem diamonds were synthesized in the Fe–Ni–C system with C10H10Fe additive, high pressures and high temperatures range of 5.2–6.2?GPa and 1250–1460°C. Experimental results indicate similar effect of hydrogen on these two types of diamonds: with the increasing content of C10H10Fe added in diamond growth environment, temperature is a crucial factor that sensitively affects the hydrogen-doped diamond crystallization. The temperature region for high-quality diamond growth becomes higher and the morphology of diamond crystal changes from cube-octahedral to octahedral. The defects on the {100} surfaces of diamond are more than those on the {111} surfaces. Fourier transform infrared spectroscopy (FTIR) results indicate that the hydrogen atoms enter into the diamond crystal lattice from {100} faces more easily. Most interestingly, under low temperature, nitrogen atoms can also easily enter into the diamond crystal lattice from {100} faces cooperated with hydrogen atoms. |
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| Keywords: | diamond HPHT hydrogen-doped C10H10Fe |
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