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Thermodynamic Analysis of Diamond Growth with Catalyst at HPHT
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Bin XU1, Li LI2, Bin TIAN3, Xiao-Hong FAN1, Li-Ming FENG1
Chinese Journal of High Pressure Physics | 2009, 23(3) : 189 - 195
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Chinese Journal of High Pressure Physics | 2009, 23(3): 189-195
Thermodynamic Analysis of Diamond Growth with Catalyst at HPHT
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Bin XU1, Li LI2, Bin TIAN3, Xiao-Hong FAN1, Li-Ming FENG1
Affiliations
  • 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
Published: 2009-06-15
Outline
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The diamond growth with Fe-based catalyst at high pressure and high temperature (HPHT) was analyzed with the determinant method of ΔG<0 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 Fe3C⇒C (diamond) +3γ-Fe and graphite⇒diamond 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+0.002 36T (K) was gained, which was closer to that presented by F. P. Bundy. Thereby the thermodynamic calculation used in this paper is feasible.

HPHT  /  diamond growth  /  catalyst  /  carbon source  /  thermodynamics
许斌, 李丽, 田彬, 范小红, 冯立明. 高温高压触媒法金刚石生长的热力学分析. 高压物理学报, 2009 , 23 (3) : 189 -195 .
Bin XU, Li LI, Bin TIAN, Xiao-Hong FAN, Li-Ming FENG. Thermodynamic Analysis of Diamond Growth with Catalyst at HPHT[J]. Chinese Journal of High Pressure Physics, 2009 , 23 (3) : 189 -195 .
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Year 2009 volume 23 Issue 3
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Article Info
  • Receive Date：2008-08-11
  • Online Date：2026-10-30
  • Published：2009-06-15
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History
  • Received：2008-08-11
  • Revised：2009-01-20
Funding
Affiliations
    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
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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