Modelling the 'universal' dielectric response in heterogeneous materials using microstructural electrical networks
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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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.
|Creators||Bowen, C. R.and Almond, D. P.|
|Uncontrolled Keywords||electric insulators,ceramic materials,zirconium compounds,electric conductivity,resistors,permittivity,microstructure|
|Departments||Faculty of Engineering & Design > Mechanical Engineering|
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