Chin. Phys. Lett.  2008, Vol. 25 Issue (10): 3801-3804    DOI:
Original Articles |
Effects of Al and Ti/Cu on Synthesis of Type-IIa Diamond Crystals in Ni70Mn25Co5-C System at HPHT
LI Shang-Sheng1, JIA Xiao-Peng1,2, ZANG Chuan-Yi2, TIAN Yu1, ZHANG Ya-Fei1, XIAO Hong-Yu1, HUANG Guo-Feng1, MA Li-Qiu1, LI Yong1, LI Xiao-Lei2, MA Hong-An1
1Key National Laboratory of Superhard Materials, Jilin University, Changchun 1300122Institute of Material Science and Engineering, Henan Polytechnic University, Jiaozuo 454000
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LI Shang-Sheng, JIA Xiao-Peng, ZANG Chuan-Yi et al  2008 Chin. Phys. Lett. 25 3801-3804
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Abstract

High-quality type-IIa gem diamond crystals are successfully synthesized in a Ni70Mn25Co5-C system by temperature gradient method (TGM) at about 5.5GPa and 1560K. Al and Ti/Cu are used as nitrogen getters respectively. While nitrogen getter Al or Ti/Cu is added into the synthesis system, some inclusions and caves tend to be introduced into the crystals. When Al is added into the solvent alloy, we would hardly gain high-quality type-IIa diamond crystals with nitrogen concentration Nc< 1ppm because of the reversible reaction of Al and N at high pressure and high temperature (HPHT). However, when Ti/Cu is added into the solvent alloy, high-quality type-IIa diamond crystals with Nc < 1ppm can be grown by decreasing the growth rate of diamonds.

Keywords: 81.05.Uw      81.10.Aj      81.10.Dn      81.10.-h     
Received: 19 January 2008      Published: 26 September 2008
PACS:  81.05.Uw  
  81.10.Aj (Theory and models of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)  
  81.10.Dn (Growth from solutions)  
  81.10.-h (Methods of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)  
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Articles by authors
LI Shang-Sheng
JIA Xiao-Peng
ZANG Chuan-Yi
TIAN Yu
ZHANG Ya-Fei
XIAO Hong-Yu
HUANG Guo-Feng
MA Li-Qiu
LI Yong
LI Xiao-Lei
MA Hong-An
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[6] Sumiya H et al 1997 J. Cryst. Growth 178 486
[7] Jia X P et al 1999 Diamond Relat. Mater. 81895
[8] Sumiya H and Satoh S 1996 Diamond Relat. Mater. 5 1359
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[10] Zang C Y et al 2006 Chin. Phys. Lett. 23 214
[11] Zang C Y et al 2004 Chin. Phys. Lett. 21 1648
[12] Zang C Y et al 2005 Chin. Phys. Lett. 22 2415
[13] Tian Y et al 2007 Chin. Phys. Lett. 24 2115
[14] Davies G 1977 Phys. Chem. Carbon 13 51
[15] Ma H A et al 2002 J. Phys.: Conden. Matter 14 11181
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