Preparation of Carbon-coated Iron Carbide Nanocrystals by Using AC Carbon Arc Discharge Method

Abstract

Abstract: Ahighly effective method for preparation of carbon-coated iron carbide nanocrystals by ACcarbon arc discharge was studied, the yield of magnetic micro powder was over 90%. The result of thermogravometric analyses(TG)(>800 ℃, O₂, 5 ℃/min) indicated that there was 17.5% of Fe wrapped by graphite carbon in the magnetic micro powder. The structural characterization by X-ray diffraction(XRD) and transmission electron microscopy(TEM) revealed that Fe₃C and Fe₅C₂ particles were wrapped by graphite carbon, no evidence of α-Fe was observed. The size of the wrapped iron carbide particles was typically in the range 3—10 nm. The formation mechanism of carbon-coated iron carbide nanocrystals was discussed. The magnetic hysteresis loop(B-H) at room temperature was investigated, it showed that B_s=2.6×10^-2 T, B_r=2.5×10^-3 T, B_r/B_s=9.7%, H_c=5.52 kA/m.

Key words: AC carbon arc discharge, Carbon-coated iron carbide nanocrystallite, Nanoparticle, Magnetic micro powder, Magnetic properties

CLC Number:

O641

TrendMD:

ZHANG Xun-Gao, JIANG Ming, LIU Ying, HAO Guang-Ming, XU Zhi-San, ZHU Ling, SHENG Rong-Sheng . Preparation of Carbon-coated Iron Carbide Nanocrystals by Using AC Carbon Arc Discharge Method[J]. Chem. J. Chinese Universities, 2001, 22(1): 91.

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Preparation of Carbon-coated Iron Carbide Nanocrystals by Using AC Carbon Arc Discharge Method

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