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

被引：10

作者：

Bowen, C. R. ^{[1
]}

Dent, A. C. E. ^{[1
]}

Almond, D. P. ^{[1
]}

Comyn, T. P. ^{[2
]}

机构：

[1] Univ Bath, Dept Mech Engn, Mat Res Ctr, Bath BA2 7AY, Avon, England

[2] Univ Leeds, Inst Mat Res, Leeds LS2 9JT, W Yorkshire, England

来源：

FERROELECTRICS | 2008年 / 370卷

关键词：

D O I：

10.1080/00150190802381522

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：166 / 175

页数：10

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