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Title: Pyroelectric activity of ferroelectric PT/PVDF-TRFE
Authors: Ploss, B
Ploss, B
Shin, FG
Chan, HLW 
Choy, CL 
Issue Date: Aug-2000
Source: IEEE transactions on dielectrics and electrical insulation, Aug. 2000, v. 7, no. 4, p. 517-522
Abstract: 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°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.
Keywords: Pyroelectric coefficience
Ferroelectric devices
Copolymer matrix
Piezoelectric materials
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE transactions on dielectrics and electrical insulation 
ISSN: 1070-9878
EISSN: 1558-4135
DOI: 10.1109/94.868071
Rights: © 2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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