Nonlinear dielectric response of periodic composite materials

A. Kolpakov, A. K. Tagantsev, Leonid V. Berlyand, A. Kanareykin

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Abstract

This paper addresses the rigorous treatment of the tunability effect (dc electric field driven variation of the permittivity) in a high-contrast two dimensional periodic composite (a matrix of a large dielectric constant ferroelectric material with linear dielectric inclusions). The theoretical analysis here shows that the trend established for the case of low linear dielectric concentrations (that the dilution with a low permittivity dielectric does not result in decrease of the tunability of the composite material), can hold for appreciable dielectric concentrations. We have even documented a pronounced increase of the tunability. The results of our simulations are in qualitative agreement with the experimental data on the composite effect in ferroelectric/dielectric binary-phase systems. The result of the numerical analysis gives no support to the "decoupled approximation" in the effective medium approach often used for the description of the dielectric non-linearity of composites.

Original languageEnglish (US)
Pages (from-to)129-137
Number of pages9
JournalJournal of Electroceramics
Volume18
Issue number1-2
DOIs
Publication statusPublished - Apr 1 2007

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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