High field dielectric properties of anisotropic polymer-ceramic composites

V. Tomer, C. A. Randall

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

Using dielectrophoretic assembly, we create anisotropic composites of BaTiO3 particles in a silicone elastomer thermoset polymer. We study a variety of electrical properties in these composites, i.e., permittivity, dielectric breakdown, and energy density as function of ceramic volume fraction and connectivity. The recoverable energy density of these electric-field-structured composites is found to be highly dependent on the anisotropy present in the system. Our results indicate that x-y -aligned composites exhibit higher breakdown strengths along with large recoverable energy densities when compared to 0-3 composites. This demonstrates that engineered anisotropy can be employed to control dielectric breakdown strengths and nonlinear conduction at high fields in heterogeneous systems. Consequently, manipulation of anisotropy in high-field dielectric properties can be exploited for the development of high energy density polymer-ceramic systems.

Original languageEnglish (US)
Article number074106
JournalJournal of Applied Physics
Volume104
Issue number7
DOIs
StatePublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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