Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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AC Conductivity and Dielectric Constant of Ni-MgO Composites

Ni-MgO 복합재료의 전기전도도와 유전상수

  • ;
  • Eric R. Kreidler
  • 박희동 (한국화학연구소 무기재료 5연구실) ;
  • Published : 1991.04.01
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Abstract

The Ni-MgO composites were prepared by coprecipitation of NiO-MgO solid solutions and their selective reduction in a hydrogen atmosphere. We report on the measurements of both ac conductivity $\sigma$ ($\omega$, f) and dielectric constant $textsc{k}$'($\omega$, f) for the Ni-MgO composites in the frequency range from 10 Hz to 10 MHz at room temperature. The frequency exponents of conductivity and dielectric constant, x and y, are found to be x=0.98$\pm$0.05 and y=0.05$\pm$0.01. These results are in good agreement with a general scaling relation $\chi$-y=1, although these values are different from the theoretical predications. The dielectric constant exponent ($textsc{k}$' f-fc -s) is found to be s=0.62$\pm$0.07 with estimated percolation threshold fc=0.20$\pm$0.02.

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References

  1. Proc. Camb. Philos. Soc. v.53 Percolation Proceses Ⅰ.Crystals and Mazes S.R. Broadbent;J.M. Hammersley
  2. Electrical Transport and Optical Properties of Inhomogeneous Media Analytic Properties of the Complex Effective Dielectric Constnat of a Composite Medium with Applications to the Derivation of Rigorous Bounds and to Percolation Problems D.J. Bergman;J.C. Garland(ed.);D.B. Tanner(ed.)
  3. Phys. Stat. Sol. v.(B)78 Hoping Conductivity in Ordered and Disordered Solids (Ⅰ) and (Ⅱ) H. Bottger;V.V. Bryksin
  4. Rev. Mod. Phys. v.45 no.4 Percolation and Conduction S.Kirkpatrick
  5. Electrical Transport and Optical Properties of inhomogeneous Media Electrical Conductivity in Inhomogeneous Media R. Landauer;J.C. Garland(ed.);D.B. Tanner(ed.)
  6. Phys. Rep. v.78 no.2 Electronic Properties of Small Metallic Particles J.A.A.J. Perenboom;P. Wyder and F. Meier
  7. Sov. Phys-Usp. v.18 no.11 Percolation Theory and Conducivity of Strongly Inhomogeneous Media B.I. Shklovskii;A.L. Efros
  8. Physica v.57 On the Random-Cluster Model.Ⅰ.Introduction and Relation to Other Models C.M. Fortuin;P.W. Kasteleyn
  9. Electrical Transport and Optical Properties of Inhomogenous Media The Geometry of the Percolation Threshold S. Kirkpatrick;J.C. Garland(ed.);D.B. Tanner(ed.)
  10. Electrical Transport and Optical Properties of Inhomogeneous Media Cooperative Phenomena in Resistor Networks and Inhomogeneous Conductivity J.P. Straleey;J.C. Garland(ed.);D.B. Tanner(ed.)
  11. Phys. Rep. v.54 no.1 Scaling Theory of Percolation Clusters D. Stauffer
  12. Phys. Rev. Lett. v.35 Percolation Conductivity in $W-Al_2O_3$ Granular Metal Films B. Abeles;H.L. Pinch;J.I. Gittleman
  13. Phys. Rev. v.B9 Conductivity in the Two-Dimensional Site Percolation Problem B.P. Watson;P.L. Leath
  14. Phys. Rev. v.B20 Percolation in Two-Dimensional Conductor-Insulator Networks with Controllable Anisatropy L.N. Smith;C. Lobb
  15. Phys. Rev. v.B15 Critical Exponents for the Conductivity of Random Resistor Lattices J.P. Straley
  16. Phys. Rev. v.B33 Experimental Study of the Three Dimensional ac Conductivity and Dielectric Constant of a Conductor-Insulator Composites Near the Percolation Threseshold Y. Song;T.W. Noh;S. Lee;J.R. Gaines
  17. Phys. Rev. Lett. v.39 Critical Behavior of the Complex Dielectric Constant Near the Percolation Threshold of a Heterogeneous Material D.J. Bergman;Y. Imry
  18. Phys. Stat. Sol. v.(b)76 Critical Bechavior of Conducivity and Dielectric Constant Near the Metal-Non Metal Transition Threshold A.L. Efors;B.L. Shklovskii
  19. Phys. Rev. v.B25 Frequency dependence of the Polarization Catastrophe at a Metal-insulator Transition and Related Problems D. Stroud;D.J. Bergman
  20. Phys. Rev. v.B28 Enhancement of the Dielectric Constant Near a Percolation Threshold D. Wilkinson;J.S. Langer;P.N. Sen.
  21. Phys. Rev. Lett. v.53 Dynamic Scaling Near the Percolation Threshold in Thin Au Films R.B. Laibowitz;Y. Gefen
  22. H.D. Park;E.R. Kreidler
  23. Phys. Rev. v.B16 Critical Exponents for Percolation Conductivity in Resistor Networks I. Webman;J. Jortner;M.H. Cohen
  24. Phys. Rev. Lett. v.50 Anomalous Diffusion on Percolating Clusters Y. Gefen;A. Aharony;S. Alexander
  25. Phys. Rev. Lett. v.46 Critical Behavior of the Dielectric Constant of a Random Composite Near the Percolation Threshold D.M. Grannan;J.C. Garland;D.B. Tanner
  26. J. Chem. Phys. v.53 Critical density in Percolation processes H. Scher;R. Zallen