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超临界流体触媒作用下石墨-金刚石转变

DOI: 10.11858/gywlxb.2002.01.001, PP. 1-6

Keywords: CO2超临界流体,石墨-金刚石相变,高温高压

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Abstract:

研究了超临界流体CO2在石墨-金刚石转变中的触媒作用。实验中,采用Ag2O作为流体触媒的先驱材料,在7.7GPa压力下,Ag2O在1200℃分解成Ag和O2,O2与石墨套管在高温高压下反应形成CO2超临界流体。研究结果表明,在7.7GPa和1500℃以上温度条件下,石墨在CO2流体触媒的作用下可转变为金刚石晶体,在1500~1700℃温度范围内合成出的金刚石具有完好的八面体形貌,与天然金刚石的生长特征非常相似。

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