Paper Title:
The Carbon Source Analysis for Diamond Crystal Growth from Fe-C System at High Pressure-High Temperature
  Abstract

Despite many studies have been carried, there is no clear understanding of the growth mechanism involved in the high-pressure and high-temperature (HPHT) diamond synthesis with metal catalyst, especially the problem about carbon source. In this paper, the lattice constants of diamond, graphite and Fe3C at HPHT were calculated with the linear expansion coefficient and elastic constant. Then based on the empirical electron theory of solids and molecules (EET), the valence electron structures of them and their common crystal planes were calculated, and the boundary condition of electron movement in the Thomas-Fermi-Dirac theory modified by Cheng (TFDC) was applied to analyzing the electron density continuity of the interface. It was found that the relative electron density differences across graphite/diamond interfaces are great and discontinuous at the first order of approximation, while the relative electron density differences across Fe3C/diamond interfaces were continuous. The results show that the carbon atom cluster is easier to decompose from Fe3C than from graphite and to transform into diamond structure, so the carbon source for diamond crystal growth may come from the decomposition of Fe3C instead of graphite. Accordingly, the diamond growth mechanism was analyzed from the viewpoint of valence electron structure.

  Info
Periodical
Edited by
Yung-Jen Lin and Wen-Cheng J. Wei
Pages
141-147
DOI
10.4028/www.scientific.net/AMR.51.141
Citation
B. Xu, L. Li, M. S. Li, C. Gao, R. H. Guo, "The Carbon Source Analysis for Diamond Crystal Growth from Fe-C System at High Pressure-High Temperature", Advanced Materials Research, Vol. 51, pp. 141-147, 2008
Online since
June 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Duo Sheng Li, Dun Wen Zuo, Rong Fa Chen, Bing Kun Xiang, Li Gang Zhao
Abstract:DC-Plasma arc behavior is one of the key factors on growth of diamond film. The results show that keeping steady DC-Plasma arc can grow...
385
Authors: Xiao Hong Fan, Bin Xu, Cai Gao
Abstract:Diamond single crystals are synthesized using artificial graphite as carbon source and iron-based alloy as catalyst in a cubic anvil apparatus...
1753
Authors: Qing Cai Su, Jian Hua Zhang, Long Wei Yin, Mu Sen Li
Chapter 7: New Functional Materials
Abstract:The microstructure of catalyst discs and fracture topography of boron-doped diamond blocks are analyzed in this paper. The results show that...
1147
Authors: Jin Bin Lu, Pu Meng, Bin Zhao, Jian Jun Liu
Chapter 6: Composite Materials
Abstract:Mono-crystal diamond was brazed with Ni-Cr alloy in protective atmosphere furnace, SEM and XRD were used to analyze the carbides on the...
505