高压物理学报2009，Vol.23Issue(3)：189-195,7.
高温高压触媒法金刚石生长的热力学分析
Thermodynamic Analysis of Diamond Growth with Catalyst at HPHT
摘要
Abstract
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+0.00236T(K) was gained,which was closer to that presented by F.P.Bundy.Thereby the thermodynamic calculation used in this paper is feasible.关键词
高温高压/金刚石生长/触媒/碳源/热力学Key words
HPHT/diamond growth/catalyst/carbon source/thermodynamics分类
化学化工引用本文复制引用
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[J].高压物理学报,2009,23(3):189-195,7.基金项目
国家自然科学基金(50772060) （50772060）
山东省自然科学基金(Y2007F11) （Y2007F11）
