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The preparation and characterization of ultrafine Fe–Ni particles

Published online by Cambridge University Press:  31 January 2011

X.L. Dong ,
Z.D. Zhang ,
X.G. Zhao ,
Y.C. Chuang ,
S.R. Jin  and
W.M. Sun
X.L. Dong
Affiliation:
Institute of Metal Research, Academia Sinica, 110015, Shenyang, People's Republic of China
Z.D. Zhang
Affiliation:
Institute of Metal Research, Academia Sinica, 110015, Shenyang, People's Republic of China
X.G. Zhao
Affiliation:
Institute of Metal Research, Academia Sinica, 110015, Shenyang, People's Republic of China
Y.C. Chuang
Affiliation:
Institute of Metal Research, Academia Sinica, 110015, Shenyang, People's Republic of China
S.R. Jin
Affiliation:
Laboratory of Ultrafine Particles, Shenyang Polytechnic University, 110023, Shenyang, People's Republic of China
W.M. Sun
Affiliation:
Laboratory of Ultrafine Particles, Shenyang Polytechnic University, 110023, Shenyang, People's Republic of China
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Abstract

Ultrafine Fe, Fe–Ni, and Ni particles were prepared by using the hydrogen plasma-metal reaction method in a mixture of H2 and Ar of 0.1 MPa. The particles were characterized by x-ray diffraction, transmission electron spectroscopy, energy disperse spectroscopy, chemical analysis, and Mössbauer spectroscopy. In contrast with bulk Fe–Ni alloys, the distinguishing features in corresponding ultrafine particles are that two phases with fcc and bcc structures coexist in a wide composition range. Ultrafine Fe–Ni particles have higher resistance to oxidation than Fe and Ni particles. The mechanism of forming particles was analyzed by means of structural and magnetic measurements. It was found that quenching is a dominant mechanism for forming paramagnetic particles. Hyperfine interactions were studied by Mössbauer spectroscopy in comparison with those in bulk Fe–Ni alloys.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 2 , February 1999 , pp. 398 - 406
Copyright
Copyright © Materials Research Society 1999

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