Kinetics of Diamond Crystallization from the Melt of the Fe−Ni−C System

X-ray powder diffraction with synchrotron radiation was used for the first time to study in situ diamond crystallization from the Fe−Ni−C melt at pressures up to 6 GPa and temperatures up to 1700 K. At 5.2 GPa over the whole temperature range of diamond crystallization (1510−1605 K), the melt is in...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2002-07, Vol.106 (26), p.6634-6637
Main Authors: Solozhenko, Vladimir L, Turkevich, Vladimir Z, Kurakevych, Oleksandr O, Crichton, Wilson A, Mezouar, Mohamed
Format: Article
Language:English
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Summary:X-ray powder diffraction with synchrotron radiation was used for the first time to study in situ diamond crystallization from the Fe−Ni−C melt at pressures up to 6 GPa and temperatures up to 1700 K. At 5.2 GPa over the whole temperature range of diamond crystallization (1510−1605 K), the melt is in equilibrium with both diamond and fcc Fe−Ni−C solid solution (γ-phase); that is, the L = C + γ monovariant eutectic reaction takes place. From the non-isothermal kinetic data, it follows that diamond crystallization is controlled by carbon diffusion in the melt. Kinetic data are best fitted by the model that assumes a constant nucleation rate and a three-dimensional growth of nuclei, with an apparent activation energy of 148(64) kJ mol-1.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp012899s