Research

Modelling Power Law Dependencies of Frequency Dependent AC Conductivity and Permittivity of Conductor-Relaxor Composites


Reference:

Bowen, C. R., Dent, A. C. E., Almond, D. P. and Comyn, T. P., 2008. Modelling Power Law Dependencies of Frequency Dependent AC Conductivity and Permittivity of Conductor-Relaxor Composites. Ferroelectrics, 370, pp. 166-175.

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Official URL:

http://dx.doi.org/10.1080/00150190802381522

Abstract

Porous lead magnesium niobate-lead titanate (PMN-PT 90:10) relaxors were impregnated with water to provide a model conductor-insulator mixture, to study their power law frequency dependency of ac conductivity, permittivity and phase angle. Relaxor materials with a range of open porosity filled with water created composites with conductor volume fractions ranging from 8.2% to 22.2%. The use of a high relative permittivity PMN-PT ( 8000) enabled the power law dispersion to be observed at relatively low frequencies ( 2 kHz). Good agreement was obtained between experimental data and predicted results based on a logarithmic mixing rule with a strong correlation between the power law exponent and conductor-insulator fraction. The model and numerical methods presented are considered a simple approach to interpret and predict and the frequency dependent properties of materials which similar heterogeneity.

Details

Item Type Articles
CreatorsBowen, C. R., Dent, A. C. E., Almond, D. P. and Comyn, T. P.
DOI10.1080/00150190802381522
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Research CentresCentre for Advanced Sensor Technologies (CAST)
Materials Research Centre
RefereedYes
StatusPublished
ID Code12078
Additional Information11th European Meeting on Ferroelectricity (EMF-2007) Bled, SLOVENIA, SEP 03-07, 2007 ID number: 000260641100022

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