Crystallization of Diamond and Graphite
Crystallization of Diamond and Graphite
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DOI：
10.1063/1.1841272
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发表时间：
1967-05
影响因子：
4.4
通讯作者：
H. M. Strong;R. E. Hanneman
中科院分区：
文献类型：
--
作者：
H. M. Strong;R. E. Hanneman
完整、稳定的镍-碳相图的关键特征是在高达54千巴的压力下建立的，这些特征与该系统中金刚石的成核和生长特性直接相关。在超过52.5kbar的压力下，在约0.3at. %的镍，这导致金刚石-石墨平衡线的有效位移。这种位移被证明是相当重要的成核和生长的金刚石在这个系统中。在低和中等驱动力下，高速金刚石生长的速率控制机制是碳在金刚石周围的熔融金属膜上的扩散。在54 kbar和1660°下观测到的扩散系数
The key features of the complete, stable nickel—carbon phase diagram have been established at pressures up to 54 kbar, and these features have been directly related to the nucleation and growth characteristics of diamonds in this system. At pressures in excess of 52.5 kbar, a liquid+graphite+diamond eutectic is formed at approximately 0.3 at. % nickel which results in an effective displacement of the diamond—graphite equilibrium line. This displacement is shown to be of considerable importance in the nucleation and growth of diamonds in this system. Under low and moderate driving forces, the rate‐controlling mechanism in the growth on a speed diamond is the diffusion of carbon across the molten metal film surrounding the diamond. The observed diffusion coefficients at 54 kbar and 1660°