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Arc Plasma Synthesis of Nanostructured Fe Powder

Published online by Cambridge University Press:  11 February 2011

Gil-Geun Lee  and
Sung-Duck Kim
Gil-Geun Lee
Affiliation:
Div. of Materials Science and Engineering, Pukyong National University, San 100, Yongdang-Dong, Nam-Gu, Busan 608–739, Korea
Sung-Duck Kim
Affiliation:
Div. of Materials Science and Engineering, Pukyong National University, San 100, Yongdang-Dong, Nam-Gu, Busan 608–739, Korea
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Abstract

To investigate the effect of the parameters of the arc plasma process on the characteristics of the iron nano powder, the hydrogen volume fraction in the powder synthesis atmosphere was changed from 10% to 50%. The particle size, phase structure and magnetism of the synthesized iron powder were studied using the FE-TEM, XRD and a vibration magnetometer at room temperature. The particle size increased simultaneously with the increase in the hydrogen volume fraction, and the particle size ranged from about 20nm to 100nm with the change of the hydrogen volume fraction increasing from 10% to 50%. The synthesized iron powder particle had a shell-core structure composed of the crystalline a-Fe in the core and the crystalline Fe3O4 in the shell. The iron nano powder synthesized under the high hydrogen volume fraction condition had a higher saturation magnetism and lower coercive force than the values of the one synthesized under the low hydrogen volume fraction condition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 740: Symposium I – Nanomaterials for Structural Applications , 2002 , I3.22
Copyright
Copyright © Materials Research Society 2003

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References

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