摘要
针对国内作为生产锯片级金刚石而普遍采用的石墨—Ni70Mn25Co5反应体系,研究了在一定的高温高压条件下金刚石的成核速率和生长速率。用石墨—金刚石转变的成核与生长动力学理论确定了在5.2GPa压力和1520K的温度下金刚石生长的活化能和表面能分别为3.77eV和0.005eV。比较表明,在石墨—Ni70Mn25Co5体系中金刚石生长的活化能和界面能的大小与国外报道的其它石墨—触媒体系的相关数据有相同的量级。进而评论了金刚石的合成机理。
Nucleation rate and growth rate of diamond under high pressure and high temperature were investigated in graphite-Ni_(70)Mn_(25)Co_5 system,which is widely used as starting materials for saw-grade diamond synthesis in China. With the help of kinetics for nucleation and growth of diamond, the activation energy and surface energy for diamond growth were determined to be respectively 3.77eV and 0.005eV at a pressure of 52 GPa and a temperature of 1520K. By comparison, the results for the present system have the same order of magnitude as those for the other graphite-catalyst system reported in the other paper. Moreover,the mechanism of graphite to diamond transition was also reviewed in this paper.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2004年第1期118-122,共5页
Journal of Synthetic Crystals
基金
中国工程物理研究院科学与技术研究基金资助项目(No.421030403)
