期刊
JOURNAL OF MATERIALS RESEARCH
卷 20, 期 6, 页码 1485-1489出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1557/JMR.2005.0205
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Nanocrystal n-diamond particles were synthesized after a pyrogenation of carbon nanotubes and colloidal Fe(OH)3 at atmospheric pressure. The product was investigated with x-ray diffraction, transmission electron microscopy, thermal gravimetric analysis, and differential thermal analysis. The results indicate that the n-diamond can be synthesized with the carbon nanotubes as carbon source. The formation mechanism of the n-diamond is suggested in this paper. With the increase of temperature and hence the carbon diffusion in iron, the phase sequence is from Fe(OH)(3) into Fe2O3, alpha-Fe, gamma-Fe, and then liquid iron. When carbon in the liquid iron is saturated, graphite separated out of the liquid iron. With the decrease of temperature, the carbon in gamma-Fe is separated out, and the n-diamond nuclei form and grow.
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