Pyroelectric activity of ferroelectric PT/PVDF-TRFE

This paper studies the pyroelectric coefficient of 0-3 composites consisting of 27%vol lead titanate (PT) powder embedded in a vinylidene fluoride-trifluoroethylene copolymer (PVDF-TRFE) matrix. The constituent phases of the composites have been polarized in four possible ways: only the copolymer po...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2000-08, Vol.7 (4), p.517-522
Main Authors: Ploss, Bernd, Ploss, Beatrix, Shin, F.G., Chan, H.L.W., Choy, C.L.
Format: Article
Language:English
Subjects:
Ceramics
Coefficients
Constituents
Copolymers
Dielectrics
Ferroelectric materials
Iron constituents
Mathematical models
Particulate composites
Permittivity
Phase measurement
Phases
Piezoelectric polarization
Powders
Pyroelectricity
Temperature distribution
Titanium compounds
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Summary:This paper studies the pyroelectric coefficient of 0-3 composites consisting of 27%vol lead titanate (PT) powder embedded in a vinylidene fluoride-trifluoroethylene copolymer (PVDF-TRFE) matrix. The constituent phases of the composites have been polarized in four possible ways: only the copolymer polarized; only the ceramic polarized; the copolymer and ceramic phases polarized in the same direction; the two phases polarized in opposite directions. The pyroelectric coefficient was measured by a dynamic method at 5 mHz within the temperature range 20 to 90/spl deg/C (which covers the ferroelectric to paraelectric phase transition temperature of the copolymer matrix). The composite with the copolymer and ceramic phases polarized in the same direction exhibits strong pyroelectric but relatively weak piezoelectric activity, and vice versa when the constituent phases are oppositely polarized. A theoretical model is used to analyze the pyroelectric coefficient of the composites in terms of the pyroelectric and dielectric properties of the copolymer matrix as determined from experiment, and those of the ceramic particles which are assumed to be temperature independent. The pyroelectric coefficient and dielectric permittivity of the ceramic particles are obtained as fitting parameters. The theoretical prediction is found to agree well with the experimental data.
ISSN:1070-9878
1558-4135
DOI:10.1109/94.868071