Effects of carbon convection field on large diamond growth under high-pressure high-temperature conditions

doi:10.1088/1674-1056/21/9/098101

Abstract Large diamond crystals were successfully synthesized by FeNi-C system using temperature gradient method under high-pressure high-temperature conditions. The assembly of the growth cell was improved and the growth process of diamond was investigated. Effects of the symmetry of carbon convection field around the growing diamond crystal were investigated systematically by adjusting the position of seed crystal in the melted catalyst/solvent. The results indicate that morphologies and metal inclusion distributions of the synthetic diamond crystals vary obviously in both symmetric and non-symmetric carbon convection fields with temperature. Moreover, finite element method was applied to analyze carbon convection mode of the melted catalyst/solvent around the diamond crystal. This work is helpful for understanding the growth mechanism of diamond.

Keywords: diamond high pressure and high temperature temperature gradient method carbon convection field

Received: 01 August 2011
Revised: 30 October 2011
Accepted manuscript online:

PACS:	81.05.ug	(Diamond)
	61.72.Lk	(Linear defects: dislocations, disclinations)
	07.35.+k	(High-pressure apparatus; shock tubes; diamond anvil cells)
	07.20.Ka	(High-temperature instrumentation; pyrometers)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50572032, 50731006, and 50801030) and the Young Scientists Fund of the National Natural Science Foundation of China (Grant Nos. 51001042 and 51002045).

Corresponding Authors: Jia Xiao-Peng
E-mail: jiaxp@jlu.edu.cn

Cite this article:

Hu Mei-Hua (胡美华), Li Shang-Sheng (李尚升), Ma Hong-An (马红安), Su Tai-Chao (宿太超), Li Xiao-Lei (李小雷), Hu Qiang (胡强), Jia Xiao-Peng (贾晓鹏) Effects of carbon convection field on large diamond growth under high-pressure high-temperature conditions 2012 Chin. Phys. B 21 098101

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Effects of carbon convection field on large diamond growth under high-pressure high-temperature conditions

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