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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 3    September 1999

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Synthesis of high grade octahedron diamond through epitaxial growth
Yi Jianhong(易建宏)

National Key Laboratoryfor Powder Metallurgy,Central South University of Technology, Changsha 410083, P.R. China

Abstract:The work was based on the relationship between the crystal structure and parameters of diamonds in the synthetic process, in which Ni-Mn-C powder catalyst was used. At first, the diamond crystals nucleated in a cubic-octahedron morphology through controlling such synthetic parameters as temperature and pressure in a parameter region where cubic-octahedron ctystals can be obtained. Then the diamond nuclei grew epitaxially into crystals with a perfect octahedron morphology through increasing the synthesis temperature and decreasing the synthesis pressure in a parameter region where octahedron crystals can be obtained.

 

Key words: high grade; diamond;eqitaxial growth

ISSN 1672-7029
CN 43-1423/U

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