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Microwave Properties of Non-Percolating Metal-Insulator Composites

Published online by Cambridge University Press:  28 February 2011

I.S. Jacobs ,
H.J. Patchen ,
S.A. Miller ,
F.J. Rachford  and
J.O. Hanson
I.S. Jacobs
Affiliation:
GE Corporate Research and Development, Schenectady, NY 12301
H.J. Patchen
Affiliation:
GE Corporate Research and Development, Schenectady, NY 12301
S.A. Miller
Affiliation:
GE Corporate Research and Development, Schenectady, NY 12301
F.J. Rachford
Affiliation:
Naval Research Laboratory, Washington, DC 20375
J.O. Hanson
Affiliation:
GE Re-entry Systems Department, Philadelphia, PA 19101
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Abstract

Permittivity and permeability have been studied at microwave frequencies (1 to 20 GHz) on artificial dielectrics of metal particles randomly loaded in a polymer up to 40 vol%. Ni-Cr alloy powder (∼1 to 37 μm) in various size fractions was prepared by gas-water atomization, providing an oxide coating for interparticle isolation. The alloy is ferromagnetic below 165 K, enabling a magnetic measure of volume loading. The complex permeability results are in very good agreement with calculations of induced magnetic dipole effects as functions of frequency and particle diameter. Permittivity results are independent of particle size and essentially constant with frequency. When compared with a highly successful effective spherical cluster model and a well-founded empirical curve, the present alloy powder exhibits a residual upward deviation attributed to nonspherical morphology. In sum, the microwave electromagnetic behavior of such non-percolating composites is rather well understood.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 195: Symposium S – Physical Phenomena in Granular Materials , 1990 , 169
Copyright
Copyright © Materials Research Society 1990

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References

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