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Chinese Journal of High Pressure Physics  > 2009  >  23(3): 189-195 .
XU Bin, LI Li, TIAN Bin, FAN Xiao-Hong, FENG Li-Ming. Thermodynamic Analysis of Diamond Growth with Catalyst at HPHT[J]. Chinese Journal of High Pressure Physics, 2009, 23(3): 189-195 . doi: 10.11858/gywlxb.2009.03.005
Citation: XU Bin, LI Li, TIAN Bin, FAN Xiao-Hong, FENG Li-Ming. Thermodynamic Analysis of Diamond Growth with Catalyst at HPHT[J]. Chinese Journal of High Pressure Physics, 2009, 23(3): 189-195 . doi: 10.11858/gywlxb.2009.03.005
shu

Thermodynamic Analysis of Diamond Growth with Catalyst at HPHT

doi: 10.11858/gywlxb.2009.03.005
  • 1.

    School of Materials Science & Engineering, Shandong Jianzhu University, Jinan 250101, China;

  • 2.

    School of Machinery & Electron, Hebei University of Engineering, Handan 056038, China;

  • 3.

    School of Materials Science & Engineering, Shandong University, Jinan 250061, China

More Information
  • Corresponding author: XU Bin
  • Received Date: 11 Aug 2008
  • Rev Recd Date: 20 Jan 2009
  • Publish Date: 15 Jun 2009
    Abstract
  • The diamond growth with Fe-based catalyst at high pressure and high temperature (HPHT) was analyzed with the determinant method of G0 in thermodynamics theory, and the changes of volume with temperature and pressure were involved in the calculation. The results show that the Fe3C phases have been formed before diamond nucleation; at the temperature and pressure range of the diamond synthesis with catalyst, the Gibbs free energies of Fe3CC(diamond)+3-Fe and graphitediamond are all negative, but the former's absolute value is much larger than the latter's, which means the former will take place more easily.Therefore, from the viewpoint of thermodynamics the formation of Fe3C reduces the potential energy of the transformation from graphite to diamond, and the diamond crystal growth with Fe based catalyst comes from the decomposition of Fe3C instead of the direct transformation from graphite. Moreover, the p-T (Pressure-Temperature) equilibrium of peq(GPa)=1.036+0.00236T (K) was gained, which was closer to that presented by F.P.Bundy. Thereby the thermodynamic calculation used in this paper is feasible.

     

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