高温高压触媒法金刚石生长的热力学分析

许斌 李丽 田彬 范小红 冯立明

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 . doi: 10.11858/gywlxb.2009.03.005
引用本文: 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 . doi: 10.11858/gywlxb.2009.03.005
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

高温高压触媒法金刚石生长的热力学分析

doi: 10.11858/gywlxb.2009.03.005
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    通讯作者:

    许斌

Thermodynamic Analysis of Diamond Growth with Catalyst at HPHT

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    Corresponding author: XU Bin
  • 摘要: 利用热力学中经典的G0判定法,探讨了Fe基触媒合成金刚石晶体生长中的碳源问题,在计算中考虑了各物相的体积随温度和压力的变化。结果表明:在金刚石形成之前,就有大量Fe3C形成,而在触媒法合成金刚石的温度和压力范围内,Fe3CC(金刚石)+3-Fe反应自由能和石墨金刚石相变自由能均为负值,但前者比后者的绝对值更大,这说明前者更容易发生。因此,从热力学角度看,Fe3C的形成降低了石墨转变为金刚石所要越过的势垒,使用Fe基触媒合成金刚石单晶的生长来源于Fe3C的分解而不是石墨的直接转化。同时推导出在1200 K以上石墨-金刚石的平衡p-T关系:peq(GPa)=1.036+0.00236T (K),与F.P.Bundy的平衡线非常接近,证明了本热力学计算方法的可行性。

     

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出版历程
  • 收稿日期:  2008-08-11
  • 修回日期:  2009-01-20
  • 发布日期:  2009-06-15

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