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Indexed by:期刊论文

Date of Publication:2004-10-06

Journal:JOURNAL OF PHYSICS-CONDENSED MATTER

Included Journals:Scopus、SCIE、EI

Volume:16

Issue:39

Page Number:6891-6895

ISSN No.:0953-8984

Abstract: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.