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
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
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.
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.
(Methods of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
引用本文:
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. Effects of Al and Ti/Cu on Synthesis of Type-IIa Diamond Crystals in Ni70Mn25Co5-C System at HPHT[J]. 中国物理快报, 2008, 25(10): 3801-3804.
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. Effects of Al and Ti/Cu on Synthesis of Type-IIa Diamond Crystals in Ni70Mn25Co5-C System at HPHT. Chin. Phys. Lett., 2008, 25(10): 3801-3804.
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