Journal
JOURNAL OF APPLIED PHYSICS
Volume 104, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2990073
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- Office of Naval Research [MURI-00014-05-1-0541]
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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. (c) 2008 American Institute of Physics. [DOI: 10.1063/1.2990073]
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