Phase diagram with a region of liquid carbon-diamond metastable states

被引：13
|
作者：
Basharin, A. Yu. [1 ]
Dozhdikov, V. S. [1 ]
Kirillin, A. V. [1 ]
Turchaninov, M. A. [1 ]
Fokin, L. R. [1 ]
机构：
[1] Russian Acad Sci, Joint Inst High Temp, Moscow, Russia
来源：
TECHNICAL PHYSICS LETTERS | 2010年 / 36卷 / 06期
基金：
俄罗斯基础研究基金会;
关键词：
TRANSFORMATION;
D O I：
10.1134/S1063785010060210
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Metastable cubic diamond has been found in the structure of solid carbon obtained by quenching of a liquid phase at a pressure (0.012 GPa) much lower than that corresponding to the existence of stable diamond. It is suggested that this metastable diamond is formed as a result of the recalescence of supercooled liquid carbon to the melting point (T (dm)) of metastable diamond due to a lower energy barrier for the formation of diamond as compared to that of graphite. A comparison between the calculated Gibbs energies of metastable phases provided an estimate of T (dm) = 4160 +/- 50 K. For the first time, metastable continuations of the curve of diamond melting at pressures of up to 0.012 GPa are constructed on the phase diagrams of carbon (according to various published data) using analytical curves described by a two-parametric Simon equation.
引用
收藏
页码：559 / 562
页数：4
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