Modelling the 'universal' dielectric response in heterogeneous materials using microstructural electrical networks

Reference:

Bowen, C. R. and Almond, D. P., 2006. Modelling the 'universal' dielectric response in heterogeneous materials using microstructural electrical networks. Materials Science and Technology, 22 (6), pp. 719-724.

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Official URL:

http://dx.doi.org/10.1179/174328406X101328

Abstract

The frequency dependent conductivity and permittivity of a ceramic composite are modelled using electrical networks consisting of randomly positioned resistors and capacitors. The electrical network represents a heterogeneous microstructure that contains both insulating (the capacitor) and conductive regions (the resistor). To validate model results, a model ceramic conductor-insulator composite was designed consisting of a porous lead zirconate titanate impregnated with different concentrations of water. Excellent agreement between experimental and model data was achieved with a strong correlation with many other ceramics, glasses and composites. It is proposed that the 'universal' dielectric response of many materials is a consequence of microstructural heterogeneity. The modelling approach could be used as a simple and effective method for microstructural design of ceramics and other materials with tailored dielectric properties.

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