Effects of carbon convection field on large diamond growth under high-pressure high-temperature conditions |
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| Authors: | Hu Mei-Hua Li Shang-Sheng Ma Hong-An Su Tai-Chao Li Xiao-Lei Hu Qiang Jia Xiao-Peng |
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| Affiliation: | a School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;b State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China |
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| Abstract: | Large diamond crystals were successfully synthesized by FeNi-C system using temperature gradient method under high-pressure high-temperature conditions. The assembly of the growth cell was improved and the growth process of diamond was investigated. Effects of the symmetry of carbon convection field around the growing diamond crystal were investigated systematically by adjusting the position of seed crystal in the melted catalyst/solvent. The results indicate that morphologies and metal inclusion distributions of the synthetic diamond crystals vary obviously in both symmetric and non-symmetric carbon convection fields with temperature. Moreover, finite element method was applied to analyze carbon convection mode of the melted catalyst/solvent around the diamond crystal. This work is helpful for understanding the growth mechanism of diamond. |
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| Keywords: | diamond high pressure and high temperature temperature gradient method carbon convection field |
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