Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/486
Title: Internal fields in PT/PVDF-TrFE 0-3 composites
Authors: Ploss, Beatrix
Ploss, Bernd
Shin, Franklin G.
Chan, Helen L. W.
Choy, Chung-loong
Subjects: Ferroelectric materials
Pyroelectric coefficience
Dielectric permittivity
Copolymer
Issue Date: 2001
Publisher: IEEE
Source: ISAF 2000 : proceedings of the 2000 12th IEEE International Symposium on Applications of Ferroelectrics, Honolulu, Hawaii, U.S.A, July 21-August 2, 2000, p. 301-304.
Abstract: Composites of ferroelectrics have a promising potential for applications, as it is possible to obtain new properties by combining two different ferroelectric materials. The spontaneous polarization of lead titanate (PT) is about an order of magnitude higher than that of vinylidenefluoride-trifluoroethylene copolymer (PVDF-TrFE). Therefore, in order to polarize the PT inclusions in a PT/PVDF-TrFE 0-3 composite, the depolarizing field must be compensated to a large extent by a counter field due to charge accumulated at the interface between the matrix and inclusions. An internal field will arise within the composite when the accumulated charge is insufficient to generate a fully compensating counter field. To demonstrate the existence of such an internal field we have studied the pyroelectric activity of composites with 27 volume % of PT in 56/44 mol % PVDF-TrFE. In the temperature range around the ferroelectric phase transition of the copolymer, induced pyroelectric activity is observed. The internal field can be estimated from an analysis of the pyroelectric activity of the composite.
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Type: Conference Paper
URI: http://hdl.handle.net/10397/486
ISBN: 0-7803-5940-2
0-7803-5941-0
Appears in Collections:MRC Conference Papers & Presentations
AP Conference Papers & Presentations

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