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论文类型： 期刊论文

发表时间： 2004-10-06

发表刊物： JOURNAL OF PHYSICS-CONDENSED MATTER

收录刊物： Scopus、SCIE、EI

卷号： 16

期号： 39

页面范围： 6891-6895

ISSN号： 0953-8984

摘要： Recently, our group has synthesized nanocrystal n-diamond and diamond-like carbon (DLC) from catalysed carbon black. Based on the results of XRD, TGA and DTA, a formation mechanism has been proposed to explain the phase transformation from carbon black to diamond nanocrystal. 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, then liquid iron. When the carbon in the liquid iron is saturated, DLC or graphite separates out of the liquid iron. With decrease of temperature, the carbon in gamma-Fe is separated out, and n-diamond nuclei form and grow.