| Original Articles |
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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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| Cite this article: |
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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.
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| Keywords:
81.05.Uw
81.10.Aj
81.10.Dn
81.10.-h
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Received: 19 January 2008
Published: 26 September 2008
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| PACS: |
81.05.Uw
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81.10.Aj
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(Theory and models of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
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81.10.Dn
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(Growth from solutions)
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81.10.-h
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(Methods of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
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