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超临界流体触媒作用下石墨-金刚石转变
引用本文:吴奇,孙力玲,景勤,曹新成,王文魁. 超临界流体触媒作用下石墨-金刚石转变[J]. 高压物理学报, 2002, 16(1): 1-6
作者姓名:吴奇  孙力玲  景勤  曹新成  王文魁
作者单位:1. 中国科学院物理研究所,北京,100080
2. 空军第二航空学院,吉林长春,130022
3. 中国科学院物理研究所,北京,100080;燕山大学材料科学与化工学院,河北秦皇岛,066044
基金项目:国家自然科学基金(50171077;10032040)
摘    要: 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7.7 GPa压力下,Ag2O在1 200 ℃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7.7 GPa和1 500 ℃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1 500~1 700 ℃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。

关 键 词:CO2超临界流体  石墨-金刚石相变  高温高压
文章编号:1000-5773(2002)01-0001-06
收稿时间:2001-11-02;
修稿时间:2001-11-02

CONVERSION OF GRAPHITE-TO-DIAMOND ASSISTED BY A FLUID CATALYST UNDER HIGH PRESSURE AND HIGH TEMPERATURE
WU Qi ,SUN Li-ling ,JING Qin ,CAO Xin-cheng ,WANG Wen-kui . CONVERSION OF GRAPHITE-TO-DIAMOND ASSISTED BY A FLUID CATALYST UNDER HIGH PRESSURE AND HIGH TEMPERATURE[J]. Chinese Journal of High Pressure Physics, 2002, 16(1): 1-6
Authors:WU Qi   SUN Li-ling   JING Qin   CAO Xin-cheng   WANG Wen-kui
Affiliation:WU Qi 1,SUN Li-ling 1,JING Qin 1,CAO Xin-cheng 3,WANG Wen-kui 1,2
Abstract:The catalyst role of supercritical fluid CO2 in the conversion of graphite-to-diamond at high pressure and high temperature has been confirmed experimentally. The complete transformation from graphite to diamond is achieved at 1 800~2 000 ℃ within 2~0.5 h under the pressure of 7.7 GPa. The change in temperature leads to morphology modification of the diamonds formed in the experiments: Diamonds with an irregular shape crystallize at 1 800~2 000 ℃ and the octahedral morphology crystallize at 1 500~1 700 ℃.
Keywords:supercritical fluid CO 2  graphite-diamond transformation  high pressure and high temperature
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