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Mélanges à fort contraste diélectrique et milieux effectifs : une théorie étendue

Abstract : Bruggeman's formula for the effective dielectric permittivity of a binary metal-insulator composite shows in thress dimensions a permittivity transition for a critical value fc=1/3 of the metal volume fraction. We present a method that allows one to correct this threshold in a perturbative way, accounting for the statistics assumed for the problem. This method originates in a renormalization for both the polarizabilities and the dipolar Green function. It leads to a modification of Bruggeman's formula. Associated numerical results are reported in the low-frequency limit. The paper ends with experimental results, analyzed in the context of this approach.
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https://hal-cea.archives-ouvertes.fr/cea-00413018
Contributor : Yves-Patrick Pellegrini <>
Submitted on : Thursday, December 16, 2010 - 4:33:55 PM
Last modification on : Monday, October 15, 2018 - 4:02:02 PM
Long-term archiving on: : Thursday, March 17, 2011 - 2:25:22 AM

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Yves-Patrick Pellegrini, Jérôme Pommier, Jean-Jacques Niez. Mélanges à fort contraste diélectrique et milieux effectifs : une théorie étendue. Comptes-Rendus de l'Académie des Sciences, Série 2, 1993, 316, pp.305-309. ⟨cea-00413018⟩

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