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Study of NiFe/SiO2 Nanocomposites

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 IMS, University of Connecticut, Storrs, CT 06269
Shihui Ge
Affiliation:
Physics Department and IMS, University of Connecticut, Storrs, CT 06269
W. A. Hines
Affiliation:
Physics Department and IMS, University of Connecticut, Storrs, CT 06269
J. I. Budnick
Affiliation:
Physics Department and IMS, 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

(Ni75Fe25)v/(SiO2)1-v nanocomposites with v =0.5, 0.7, and 1.0, where 75 denotes the atomic percent of Ni in the Ni-Fe alloy phase and v denotes the volume fraction of the magnetic constituent in the composite, were synthesized using a wet chemical approach. The x-ray diffraction and TEM experiments show that the synthetic NiFe/SiO2 is a two-phase composite system in that an amorphous insulating SiO2 layer coats each Ni-Fe particle. The Ni-Fe particle is in a fcc Ni-Fe alloy state. Its size can be controlled over a rather large range between 5 nm to 70 nm by adjusting the reaction parameters. Particular attention was paid to reduce the chemical reaction temperature so as to insure the smallness of the particle size. Meanwhile, measurements of the saturation magnetization indicated that the higher the heat treatment temperature, the more complete the chemical reaction to form the Ni-Fe alloys from precursor materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 703: Symposia U/V – Nanophase and Nanocomposite Materials IV , 2001 , V1.6
Copyright
Copyright © Materials Research Society 2002

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References

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