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- Title
Characterization of ultrafine γ-Fe(C), α-Fe(C) and Fe3C particles synthesized by arc-discharge in methane.
- Authors
Dong, X. L.; Zhang, Z. D.; Xiao, Q. F.; Zhao, X. G.; Chuang, Y. C.; Jin, S. R.; Sun, W. M.; Li, Z. J.; Zheng, Z. X.; Yang, H.
- Abstract
Ultrafine γ-Fe(C), α-Fe(C) and Fe3C particles were prepared by arc-discharge synthesis in a methane atmosphere. The phases, morphology, structure and surface layer of the particles were studied by means of X-ray diffraction (XRD), transmission electron microscopy (TEM) techniques and X-ray photoelectron spectroscopy (XPS). It was found that the mean particle size ranged from 9.8 to 12.8 nm. The surface of particles mostly consisted of a carbon layer and a little oxide. Phase transformation from γ-Fe(C) to α-Fe(C) was studied by annealing in vacuum and by differential thermal analysis and thermogravimetry (DTA–TGA) measurement. The abundance of γ-Fe(C) was determined by a magnetization measurement to be approximately 30%. Phase transformation occurred between 300 and 500 °C in a flowing argon atmosphere. The Fe3C particles oxidized to α-Fe2O3 and carbon dioxide at 610 °C or so. © 1998 Chapman & Hall
- Subjects
FERROMAGNETIC materials; METHANE; X-ray diffraction; TRANSMISSION electron microscopy; X-ray photoelectron spectroscopy; THERMOGRAVIMETRY; ANNEALING of metals; PHASE transitions
- Publication
Journal of Materials Science, 1998, Vol 33, Issue 7, p1915
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1023/A:1004369708540