A dielectric mixing law for porous ceramics based on fractal boundaries

J. P. Calame, A. Birman, Y. Carmel, D. Gershon, B. Levush, A. A. Sorokin, V. E. Semenov, D. Dadon, L. P. Martin, M. Rosen

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

The effect of porosity on the complex dielectric permittivity of microwave sintered zinc oxide at room temperature and 2.45 GHz is reported. The predictions of conventional Maxwell-Garnet theory and the effective medium approximation are in poor agreement with the experimental results. Various methods are employed to investigate the system in an effort to come up with new mixing laws, including combinations of these two analytic theories and finite difference electromagnetic simulations of representative microstructures. A model that assumes the existence of dielectrically inactive, fractal-geometry boundaries between ceramic grains provides an excellent description of the results with no free parameters. It gives physical insight into the experimentally observed mixing law.

Original languageEnglish
Pages (from-to)3992-4000
Number of pages9
JournalJournal of Applied Physics
Volume80
Issue number7
DOIs
StatePublished - 1 Oct 1996
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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