Permittivity effects of particle agglomeration in ferroelectric ceramic-epoxy composites using finite element modeling
| Autor: | Peter N. Saeta, Lupe Macintosh, Richard C. Haskell, Scott H. Tan, Todd C. Monson, Chris Gage, Kirklann Lau, Jonas L. Kaufman, Robert G. Gambee, Ashka Shah, Albert Dato |
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| Rok vydání: | 2018 |
| Předmět: |
Permittivity
Materials science Particle number Composite number Physics::Optics General Physics and Astronomy 02 engineering and technology Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences lcsh:QC1-999 0104 chemical sciences Condensed Matter::Materials Science chemistry.chemical_compound chemistry Effective medium approximations visual_art Barium titanate visual_art.visual_art_medium Particle Ceramic Composite material 0210 nano-technology lcsh:Physics |
| Zdroj: | AIP Advances, Vol 8, Iss 12, Pp 125020-125020-16 (2018) |
| ISSN: | 2158-3226 |
| DOI: | 10.1063/1.5053442 |
| Popis: | The size dependence of the dielectric constants of barium titanate or other ferroelectric particles can be explored by embedding particles into an epoxy matrix whose dielectric constant can be measured directly. However, to extract the particle dielectric constant requires a model of the composite medium. We compare a finite element model for various volume fractions and particle arrangements to several effective medium approximations, which do not consider particle arrangement explicitly. For a fixed number of particles, the composite dielectric constant increases with the degree of agglomeration, and we relate this increase to the number of regions of enhanced electric field along the applied field between particles in an agglomerate. Additionally, even for dispersed particles, we find that the composite method of assessing the particle dielectric constant may not be effective if the particle dielectric constant is too high compared to the background medium dielectric constant. |
| Databáze: | OpenAIRE |
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