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- Title
Modelling the 'universal' dielectric response in heterogeneous materials using microstructural electrical networks.
- Authors
Bowen, C. R.; Almond, D. P.
- 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.
- Subjects
DIELECTRICS; INHOMOGENEOUS materials; MICROSTRUCTURE; ELECTRIC networks; CAPACITORS; ELECTRIC resistors
- Publication
Materials Science & Technology, 2006, Vol 22, Issue 6, p719
- ISSN
0267-0836
- Publication type
Article
- DOI
10.1179/174328406X101328