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Dielectric Spectroscopy of Insulator/Conductor Composites

Published online by Cambridge University Press:  10 February 2011

Julie Runyan Kolcan ,
Rosario Gerhardt ,
Robert Ruh  and
David S. McLachlan
Julie Runyan Kolcan
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332–0245
Rosario Gerhardt
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332–0245
Robert Ruh
Affiliation:
Universal Technology Corporation, Beavercreek, Ohio 45431–1600
David S. McLachlan
Affiliation:
Physics Department, University of the Witwatersrand, PO Wits 2050, Johannesburg, South Africa
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Abstract

The dielectric properties of composites are affected in different ways by a number of parameters. These include the electrical properties of both the filler and matrix, the wetting properties of the matrix on the filler, the size and shape of the filler, and the amount of the filler. Most composite systems have been studied via dc resistivity measurements which clearly show the effect of the addition of a second phase to an insulating matrix. However, frequency dependent measurements can provide additional insight into the mechanisms controlling the electrical response. The frequency dependence of the dielectric properties of composites will be shown. The permittivity and admittance plots of BN/B4C composites will be given and the relevance of the trends seen in them will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 500: Symposium EE – Electrically Based Microstructural Characterization II , 1997 , 341
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

1. McLachlan, D.S., Blaszkiewicz, M., and Newnham, R.E., “Electrical Resistivity of Composites,” J. Am. Ceram. Soc, 73[8] (1990) 2187–2203.Google Scholar
2. Zallen, R., The Physics of Amorphous Solids, Chapter 4, John Wiley and Sons, New York (1983).Google Scholar
3. Wu, J. and McLachlan, D.S., Phys. Rev. B, to be published.Google Scholar
4. McLachlan, D.S., Heiss, W.D., Chiteme, C., and Wu, J., Phys. Rev. B, to be published.Google Scholar
5. Ross McDonald, J., Impedance Spectroscopy Emphasizing Solid Materials and Systems, John Wiley and Sons, New York (1987).Google Scholar
6. Cao, W. and Gerhardt, R., “Calculation of Various Relaxation Times and Conductivity for a Single Dielectric Relaxation Process,” Solid State Ionics, 42 (1990) 213–221.Google Scholar
7. Gerhardt, R., “Dielectric and Impedance Spectroscopy Revisited: Distinguishing Localized Relaxation from Long Range Conductivity,” J. Phys. Chem. Solids. 55[12] (1994) 1491–1506 Google Scholar
8. Private communication with Sofianos, A. and McLachlan, D.S. Google Scholar
9. VonHippel, A.R., Dielectrics and Waves, John Wiley and Sons, New York (1953).Google Scholar
10. Ruh, R., Kearns, M., Zangvil, A., and Xu, Y., “Phase and Property Studies of Boron Carbide-Boron Nitride Composites,” Journal of the American Ceramics Society, 75[4] (1992) 864–872.Google Scholar
11. CRC Handbook of Chemistry and Physics, ed. By Lide, D.R., CRC Press, Ann Arbor (1994) 12–45.Google Scholar