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Title: Pyroelectric or piezoelectric compensated ferroelectric composites
Authors: Ploss, Beatrix
Ploss, Bernd
Shin, Franklin G.
Chan, Helen L. W.
Choy, Chung-loong
Subjects: Lead compounds
Polymer blends
Filled polymers
Ferroelectric materials
Piezoelectric materials
Dielectric polarisation
Issue Date: 8-May-2000
Publisher: American Institute of Physics
Source: Applied physics letters, 8 May 2000, v. 76, no. 19, p.2776-2778
Abstract: The matrix and inclusions of 0-3 composites of lead titanate (PT) in polyvinylidenefluoride trifluoroethylene (P(VDF-TrFE)) have been independently poled by a special poling method. The polarization states of both constituents are investigated by the measurement of the dynamic pyroelectric coefficients of the composites in the temperature range of 20-90 °C, within which the copolymer matrix undergoes a ferroelectric-paraelectric phase change. The pyroelectric coefficients of PT and P(VDF-TrFE) have the same sign, while their piezoelectric coefficients have opposite signs. This allows the preparation of composites with enhanced pyroelectric but reduced piezoelectric activity when the matrix and inclusions are polarized in the same direction, or vice versa if the constituents are oppositely polarized. For a PT volume fraction of 27% it was possible to prepare a pyroelectric composite with vanishing piezoelectric activity or a piezoelectric composite with vanishing pyroelectric activity by poling the matrix and inclusions in parallel or antiparallel directions.
Rights: © 2000 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in B. Ploss et al. Appl. Phys. Lett. 76, 2776 (2000) and may be found at
Type: Journal/Magazine Article
ISSN: 0003-6951
Appears in Collections:MRC Journal/Magazine Articles
AP Journal/Magazine Articles

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