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2Â¥2009-09-14 16:19:45
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Mechanism of diamond-to-graphite transformation at diamond-stable conditions Holdings ¸ü¶àÑ¡Ïî ×÷Õß: Zang CY (Zang ChuangYi)1, Chen XZ (Chen XiaoZhou)1, Hu Q (Hu Qiang)1, Ma HA (Ma HongAn)2, Jia XP (Jia XiaoPeng)1,2 À´Ô´³ö°æÎï: CHINESE SCIENCE BULLETIN ¾í: 54 ÆÚ: 14 Ò³: 2535-2538 ³ö°æÄê: JUL 2009 ±»ÒýƵ´Î: 0 ²Î¿¼ÎÄÏ×: 14 ÒýÖ¤¹ØÏµÍ¼ »áÒéÐÅÏ¢: 20th International Congress on Sexual Plant Reproduction Brasilia, BRAZIL, AUG 04-08, 2008 ÕªÒª: The diamond-to-graphite transformation at diamond-stable conditions is studied by temperature gradient method (TGM) under high pressure and high temperature (HPHT), although it is unreasonable from the view of thermodynamic considerations. It is found that, at diamond-stable conditions, for example, at 5.5 GPa and 1550 K, with fine diamond grits as carbon source and NiMnCo alloy as metal solvent assisted, not only large diamond crystals, but metastable regrown graphite crystals would be grown by layer growth mechanism, and the abundance of carbon source in the higher temperature region is indispensable for the presence of metastable regrown graphite crystals. From this transformation, it is concluded that, with metal solvent assisted, although the mechanism of crystal growth could be understood by the macro-mechanism of solubility difference between diamond and graphite in metal solvents, from the point of micro-mechanism, the minimum growth units for diamond or graphite crystals should be at atomic level and unrelated to the kinds of carbon source ( diamond or graphite), which could be accumulated free-selectively on the graphite with sp(2)pi or diamond crystals with sp(3) bond structure. ÎÄÏ×ÀàÐÍ: Proceedings Paper ÓïÑÔ: English ×÷Õ߹ؼü´Ê: transformation; diamond; graphite; HPHT KeyWords Plus: SYNTHETIC DIAMONDS; GROWTH RATES; TEMPERATURE; CRYSTAL; SYSTEM ͨѶ×÷ÕßµØÖ·: Zang, CY (ͨѶ×÷Õß), Henan Polytech Univ, Inst Mat Sci & Engn, Jiaozuo 454000, Peoples R China µØÖ·: 1. Henan Polytech Univ, Inst Mat Sci & Engn, Jiaozuo 454000, Peoples R China 2. Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China µç×ÓÓʼþµØÖ·: dndzcy@hpu.edu.cn ³ö°æÉÌ: SCIENCE PRESS, 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA ѧ¿ÆÀà±ð: Multidisciplinary Sciences IDS ºÅ: 478FD ISSN: 1001-6538 DOI: 10.1007/s11434-009-0401-2 |
3Â¥2009-09-14 16:21:11
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zhuzhu20081593(½ð±Ò+15,VIP+0):ллÄã 9-14 16:34
zhuzhu20081593(½ð±Ò+15,VIP+0):ллÄã 9-14 16:34
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Morphology Change of Metastable Regrown Graphite with Boron Additive under HPHT Holdings ¸ü¶àÑ¡Ïî ×÷Õß: Zang CY (Zang, Chuanyi)1, Chen XZ (Chen, Xiaozhou)1, Hu Q (Hu, Qiang)1, Guo W (Guo, Wei)2, Huang GF (Huang, Guofeng)2, Jia XP (Jia, Xiaopeng)2 À´Ô´³ö°æÎï: JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY ¾í: 25 ÆÚ: 4 Ò³: 539-542 ³ö°æÄê: JUL 2009 ±»ÒýƵ´Î: 0 ²Î¿¼ÎÄÏ×: 14 ÒýÖ¤¹ØÏµÍ¼ ÕªÒª: By temperature gradient method under high pressure and high temperature (HPHT), with NiMnCo alloy as the solvent metal, at diamond-stable region of about 5.4 GPa and 1500 K, metastable regrown graphite crystals of different morphology were synthesized. With B as an additive incorporated into the NiMnCo-C system, metastable, regrown graphite crystals of sphere-like shape were firstly obtained under HPHT. If the growth system does not contain B, sheet-like regrown graphite crystals, most with regular hexagonal morphology, are grown upwards and standing vertically in the metal solvent. When B additive of 1.0 wt pct was added into carbon source (graphite powder), all metastable regrown graphite crystals took on the habit of regular sphere-like morphology, and were grown by a spiral layer growth mechanism. ÎÄÏ×ÀàÐÍ: Article ÓïÑÔ: English ×÷Õ߹ؼü´Ê: Graphite; High pressure and high temperature; Temperature gradient method; Morphology KeyWords Plus: HIGH-NITROGEN CONCENTRATION; LARGE DIAMOND CRYSTALS; GROWTH; CRYSTALLIZATION; TEMPERATURE; CARBON; SYSTEM; NAN3 ͨѶ×÷ÕßµØÖ·: Zang, CY (ͨѶ×÷Õß), Henan Polytech Univ, Inst Mat Sci & Engn, Jiaozuo 454000, Peoples R China µØÖ·: 1. Henan Polytech Univ, Inst Mat Sci & Engn, Jiaozuo 454000, Peoples R China 2. Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China µç×ÓÓʼþµØÖ·: dndzcy@hpu.edu.cn »ù½ð×ÊÖúÖÂл: »ù½ð×ÊÖú»ú¹¹ ÊÚȨºÅ National Natural Science Foundation of China 50172018 Foundation of He'nan Educational Committee 2009A430014 State Key Laboratory of Superhard Materials of Jilin University 200801 [ÏÔʾ»ù½ð×ÊÖúÐÅÏ¢] This work was supported by the National Natural Science Foundation of China under grant No. 50172018, the Foundation of He'nan Educational Committee under grant No. 2009A430014, and the Open Research Fund Program of State Key Laboratory of Superhard Materials of Jilin University under grant No. 200801. ³ö°æÉÌ: JOURNAL MATER SCI TECHNOL, 72 WENHUA RD, SHENYANG 110015, PEOPLES R CHINA ѧ¿ÆÀà±ð: Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering IDS ºÅ: 480ZE ISSN: 1005-0302 |
4Â¥2009-09-14 16:22:18













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