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At pressure 5.0-5.7 GPa and temperature 1250-1600 ℃, the conditions of synthesis Gem-diamond are reported using FeNiMnCo catalyst by temperature gradient method (TGM), and the P-T phase diagram is given. Temperature field and carbon concentration gradient are simulated based on finite element method (FEM). The results of simulation and experiment show that type-I temperature field is suitable for growing high-quality large sheet-shaped Gem-diamond and small tower-shaped Gem-diamond; however, choosing type-II temperature field, both large sheet-shaped Gem-diamond and large tower-shaped Gem-diamond can be synthesized (type-Ib diamond and boron-doped diamond). On this basis, the growth speed and crystal quality are found to be determined by the carbon concentration gradient, and the rule that high-quality Gem-diamond can be synthesized when temperature field is suitable for the size and shape of diamond growing is given. The pressure and temperature regions for {110} and {113} faces to exist are studied. According to the analysis of Fourier infrared spectroscopy, it is found that the nitrogen concentrations in type-Ib and boron-doped diamonds synthesized by FeNiMnCo catalyst, which are due to the influence of Fe element, are lower than that of normal diamond. The diamond with low nitrogen can be used as an optical material with better transmission characteristics.
[1] Yamamoto M, Kumasaka T, Ishikawa T 2000 Rev. High Press Sci. Tech. 10 56
[2] Sumiya H, Toda N, Satoh S 1999 Rev. High Press. Sci. Tech. 9 255
[3] Isoya J, Kanda H, Akaishi M, Morita Y, Ohshima T 1997 Diamond Rel. Mater. 6 356
[4] Klein C A 2002 Diamond Rel. Mater. 11 218
[5] Ying X T, Luo J L, Wang P N, Cui M Q, Zhao Y D, Li G, Zhu P P 2003 Diamond Rel. Mater. 12 719
[6] Xie J, Tamaki J 2006 Aviation Journal of Materials Processing Technology 180 83
[7] Moseley S G, Bohn K P, Goedickemeier M 2009 International Journal of Refractory Metals and Hard Materials 27 394
[8] Zong W J, Cheng K, Li D, Sun T, Liang Y C 2007 International Journal of Machine Tools and Manufacture 47 852
[9] Sharif Uddin M, Seah K H W, Rahman M, Li X P, Liu K 2007 Journal of Materials Processing Technology 185 24
[10] Hajj H E, Denisenko A, Kaiser A, Balmer R S, Kohn E 2008 Diamond Rel. Mater. 17 1259
[11] Doneddu D, Guy O J, Dunstan P R, Maffeis G G, Teng K S, Wilks S P, Lgic P, Twitchen D, Clement R M 2007 Surf. Sci. 602 1135
[12] Wang L J, Liu J M, Su Q F, Shi W M, Xia Y B 2006 Acta Phys. Sin. 55 2518 (in Chinese) [王林军, 刘健敏, 苏清峰, 史伟民, 夏义本 2006 55 2518]
[13] Xiao H Y, Jia X P, Ma H A, Li S S, Li Y, Zhao M 2010 Chinese Science Bulletin 55 1
[14] Kanda H, Akaishi M, Yamaoka S 1999 Diamond Rel. Mater. 8 1441
[15] Liang Z Z, Liang J Q, Zheng N, Jia X P, Li G J 2009 Acta Phys. Sin. 58 8039 (in Chinese) [梁中翥, 梁静秋, 郑娜, 贾晓鹏, 李桂菊 2009 58 8039]
[16] Qin J M, Zhang Y, Cao J M, Tian L F 2011 Acta Phys. Sin. 60 058102 (in Chinese) [秦杰明, 张莹, 曹建明, 田立飞 2009 60 058102]
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[1] Yamamoto M, Kumasaka T, Ishikawa T 2000 Rev. High Press Sci. Tech. 10 56
[2] Sumiya H, Toda N, Satoh S 1999 Rev. High Press. Sci. Tech. 9 255
[3] Isoya J, Kanda H, Akaishi M, Morita Y, Ohshima T 1997 Diamond Rel. Mater. 6 356
[4] Klein C A 2002 Diamond Rel. Mater. 11 218
[5] Ying X T, Luo J L, Wang P N, Cui M Q, Zhao Y D, Li G, Zhu P P 2003 Diamond Rel. Mater. 12 719
[6] Xie J, Tamaki J 2006 Aviation Journal of Materials Processing Technology 180 83
[7] Moseley S G, Bohn K P, Goedickemeier M 2009 International Journal of Refractory Metals and Hard Materials 27 394
[8] Zong W J, Cheng K, Li D, Sun T, Liang Y C 2007 International Journal of Machine Tools and Manufacture 47 852
[9] Sharif Uddin M, Seah K H W, Rahman M, Li X P, Liu K 2007 Journal of Materials Processing Technology 185 24
[10] Hajj H E, Denisenko A, Kaiser A, Balmer R S, Kohn E 2008 Diamond Rel. Mater. 17 1259
[11] Doneddu D, Guy O J, Dunstan P R, Maffeis G G, Teng K S, Wilks S P, Lgic P, Twitchen D, Clement R M 2007 Surf. Sci. 602 1135
[12] Wang L J, Liu J M, Su Q F, Shi W M, Xia Y B 2006 Acta Phys. Sin. 55 2518 (in Chinese) [王林军, 刘健敏, 苏清峰, 史伟民, 夏义本 2006 55 2518]
[13] Xiao H Y, Jia X P, Ma H A, Li S S, Li Y, Zhao M 2010 Chinese Science Bulletin 55 1
[14] Kanda H, Akaishi M, Yamaoka S 1999 Diamond Rel. Mater. 8 1441
[15] Liang Z Z, Liang J Q, Zheng N, Jia X P, Li G J 2009 Acta Phys. Sin. 58 8039 (in Chinese) [梁中翥, 梁静秋, 郑娜, 贾晓鹏, 李桂菊 2009 58 8039]
[16] Qin J M, Zhang Y, Cao J M, Tian L F 2011 Acta Phys. Sin. 60 058102 (in Chinese) [秦杰明, 张莹, 曹建明, 田立飞 2009 60 058102]
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