Effects of carbon diffusing field in alloy solvent on the growth of tower-shape diamond single crystal |
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Authors: | HongYu Xiao HongAn Ma Yu Tian Rui Li ShangSheng Li LiQiu Ma Yong Li XiaoPeng Jia |
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Affiliation: | 1 State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China; 2 School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; 3 School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130012, China |
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Abstract: | High quality type-Ib tower-shape diamond single crystals were synthesized in cubic anvil high pressure apparatus (SPD-6×1200) at 5.4 GPa and 1250–1450°C. The (100) face of seed crystal was used as the growth face, and FeNiMnCo alloy was used as the solvent/catalyst. Two kinds of carbon diffusing fields (type-B and type-G) were simulated by finite element method (FEM). Using the two kinds of carbon diffusing fields, many diamond single crystals were synthesized. The effects of carbon diffusing fields on the crystal quality and β value (the ratio of height to diameter of diamond crystal) were studied. The results show that using type-B diffusing field, considerable inclusions appeared in tower-shape diamond crystals with high β values; however, using type-G diffusing field, inclusions were reduced markedly in high β values tower-shape diamond crystals, and the crystal, up to 0.6 carat in weight and 5.3 mm in size, was synthesized. Experimental phenomena were explained well with the help of the FEM. |
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Keywords: | tower-shape diamond FEM high pressure and high temperature diffusing field |
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