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Fe/SiO2 Nanocomposite Soft Magnetic Materials

Published online by Cambridge University Press:  15 March 2011

S. Hui ,
Y. D. Zhang ,
T. D. Xiao ,
Mingzhong Wu ,
Shihui Ge ,
W. A. Hines ,
J. I. Budnick ,
M. J. Yacaman  and
H. E. Troiani
S. Hui
Affiliation:
Inframat Corporation, 74 Batterson Park Road, Farmington, CT 06032
Y. D. Zhang
Affiliation:
Inframat Corporation, 74 Batterson Park Road, Farmington, CT 06032
T. D. Xiao
Affiliation:
Inframat Corporation, 74 Batterson Park Road, Farmington, CT 06032
Mingzhong Wu
Affiliation:
Physics Department and Institute of Materials Science, University of Connecticut, Storrs, CT 06269
Shihui Ge
Affiliation:
Physics Department and Institute of Materials Science, University of Connecticut, Storrs, CT 06269
W. A. Hines
Affiliation:
Physics Department and Institute of Materials Science, University of Connecticut, Storrs, CT 06269
J. I. Budnick
Affiliation:
Physics Department and Institute of Materials Science, University of Connecticut, Storrs, CT 06269
M. J. Yacaman
Affiliation:
Department of Chemical Engineering, University of Texas, Austin, TX 78712
H. E. Troiani
Affiliation:
CNM and Texas Materials Institute, University of Texas, Austin, TX 78712
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Abstract

In an effort to explore new highly resistive soft magnetic materials, Fe/SiO2 nanocomposite materials have been synthesized using a wet chemical reaction approach in which the precursor complex was annealed at various temperatures. The crystallographic structure, nanostructure, morphology, and magnetic properties of the synthetic Fe/SiO2 particles were studied by x-ray diffraction, transmission electron microscopy, and magnetic measurements. The experimental results show that for this approach, the [.alpha]-Fe particles are coated with amorphous silica. The progress of the reaction, the purity of Fe/SiO2 in the synthetic powder, and the Fe particle size are highly dependent on the annealing temperature. By adjusting the annealing temperature, the particle size can be controlled from approximately 20 nm to 70 nm. For the synthetic nanopowder obtained by H2 reduction at 400 °C, there exists a superparamagnetic behavior below room temperature; while for the nanopowders obtained by reduction at higher temperatures, the ferromagnetic behavior is dominant. Based on these studies, optimum synthesis conditions for Fe/SiO2 nanocomposites is determined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 703: Symposia U/V – Nanophase and Nanocomposite Materials IV , 2001 , V6.3
Copyright
Copyright © Materials Research Society 2002

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References

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