Separate poling of inclusions and matrix in PT/P(VDF-TrFE) 0-3 composites

A procedure for separate poling of the ceramic particles and the copolymer matrix of 0-3 composites has been developed. 2.5 /spl mu/m thick films of 56/44 mol-% vinylidene fluoride-trifluoroethylene (P(VDF-TrFE)) copolymer embedded with 8 volume% lead titanate (PT) ceramic particles were investigate...

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Bibliographic Details
Main Authors: Ploss, B., Shin, F.G., Chan, H.L.W., Choy, C.L.
Format: Conference Proceeding
Language:English
Subjects:
Ceramics
Ferroelectric materials
Frequency measurement
Permittivity measurement
Phase measurement
Polarization
Pyroelectricity
Temperature distribution
Thick films
Titanium compounds
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Summary:A procedure for separate poling of the ceramic particles and the copolymer matrix of 0-3 composites has been developed. 2.5 /spl mu/m thick films of 56/44 mol-% vinylidene fluoride-trifluoroethylene (P(VDF-TrFE)) copolymer embedded with 8 volume% lead titanate (PT) ceramic particles were investigated. First, the ceramic particles in the composite are polarized under a DC-field at temperatures above the Curie temperature of the copolymer. In the second step the P(VDF-TrFE) matrix is poled at room temperature in an AC-field at a frequency of 1 Hz. The degree of poling of the composite is then investigated by the measurement of the second order permittivity and the pyroelectric coefficient over a temperature range covering the ferroelectric and paraelectric phase of the copolymer matrix. The results show that the polarization of the ceramic is unchanged by the subsequent AC poling of the copolymer matrix.
ISSN:1099-4734
2375-0448
DOI:10.1109/ISAF.1998.786693