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| Journal Article | PreJuSER-20337 |
; ;
2012
Elsevier Science
Amsterdam [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.jeurceramsoc.2011.10.017
Abstract: It is well known that the already large dielectric constants of some electrolytes like BaTiO3 can be enhanced further by adding metallic (e.g. Ni, Cu or Ag) nanoparticles. The enhancement can be quite large, a factor of more than 1000 is possible. The consequences for the properties will be discussed in the present paper applying a brick-layer model (BLM) for calculating dc-resistivities of thin layers and a modified one (PBLM) that includes percolation for calculating dielectric properties of these materials. The PBLM results in an at least qualitative description and understanding of the physical phenomena: This model gives an explanation for the steep increase of the dielectric constant below the percolation threshold and why this increase is connected to a dramatic decrease of the breakdown voltage as well as the ability of storing electrical energy. We conclude that metallic electrolyte composites like BaTiO3 are not appropriate for energy storage. (C) 2011 Elsevier Ltd. All rights reserved.
Keyword(s): J ; Percolation (auto) ; Composites (auto) ; Dielectric properties (auto) ; BaTiO3 and Titanates (auto) ; Capacitors (auto)
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