Surface Structure of Large Synthetic Diamonds by High Temperature and High Pressure
ZANG Chuan-Yi1,2, HUANG Guo-Feng2, MA Hong-An1,2, JIA Xiao-Peng1,2
1Institute of Material Science and Engineering, Henan Polytechnic University, Jiaozuo 4540002Key National Laboratory for Superhard Materials, Jilin University, Changchun 130012
Surface Structure of Large Synthetic Diamonds by High Temperature and High Pressure
1Institute of Material Science and Engineering, Henan Polytechnic University, Jiaozuo 4540002Key National Laboratory for Superhard Materials, Jilin University, Changchun 130012
摘要With NiMnCo and FeCoNi alloys as solvent metals, large single-crystal diamonds of about 3mm across are grown by temperature gradient method (TGM) under high temperature and high pressure (HPHT). Although both {100} and {111} surfaces are developed by a layer growth mechanism, some different characteristic patterns are seen clearly on the different surfaces, no matter whether NiMnCo or FeCoNi alloys are taken as the solvent metals. For {100} surface, it seems to have been melted or etched greatly, no dendritic patterns to be found, and only a large number of growth hillocks are dispersed net-likely; while for {111} surface, it often seems to be more smooth-faced, no etched or melted traces are present even when a lot of depressed trigonal growth layers. This distinct difference between {111} and {100} surfaces is considered to be related to the difference of surface-atom distribution of different surfaces, and {111} surfaces should be more difficult to be etched and more steady than {100} surfaces.
Abstract：With NiMnCo and FeCoNi alloys as solvent metals, large single-crystal diamonds of about 3mm across are grown by temperature gradient method (TGM) under high temperature and high pressure (HPHT). Although both {100} and {111} surfaces are developed by a layer growth mechanism, some different characteristic patterns are seen clearly on the different surfaces, no matter whether NiMnCo or FeCoNi alloys are taken as the solvent metals. For {100} surface, it seems to have been melted or etched greatly, no dendritic patterns to be found, and only a large number of growth hillocks are dispersed net-likely; while for {111} surface, it often seems to be more smooth-faced, no etched or melted traces are present even when a lot of depressed trigonal growth layers. This distinct difference between {111} and {100} surfaces is considered to be related to the difference of surface-atom distribution of different surfaces, and {111} surfaces should be more difficult to be etched and more steady than {100} surfaces.
ZANG Chuan-Yi;HUANG Guo-Feng;MA Hong-An;JIA Xiao-Peng;. Surface Structure of Large Synthetic Diamonds by High Temperature and High Pressure[J]. 中国物理快报, 2007, 24(10): 2991-2993.
ZANG Chuan-Yi, HUANG Guo-Feng, MA Hong-An, JIA Xiao-Peng,. Surface Structure of Large Synthetic Diamonds by High Temperature and High Pressure. Chin. Phys. Lett., 2007, 24(10): 2991-2993.
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2007, Vol. 24 
