Properties of quasi 1-3 piezoelectric PZT-epoxy composites obtained by dielectrophoresis
van den Ende, D.A.
van der Zwaag, S.
TNO Industrie en Techniek
The dielectric and piezoelectric properties of piezoelectric particleepoxy polymer composites structured into 1-3 composites via dielectrophoresis during curing are reported. The dielectrophoretic alignment induces a textured microstructure in the composite, with particles forming chains in the direction of the electric field. The particles form a quasi-1-3 connectivity structure which influences the dielectric and piezoelectric properties of the composite in this direction. The maximum g33 of the Pb(Zr,Ti)O3epoxy system that was investigated was increased compared to the maximum g33 for a 0-3 composite of the same system. Furthermore, these maximum values are achieved at a Pb(Zr,Ti)O3 volume fraction of 0.1, which is much lower than in conventional 0-3 composites. The effect of the amplitude of the applied electric field at high volume fractions of filler on the dielectric and piezoelectric properties of the composites is discussed. Additionally, the polarisation behavior of the composites at high electric fields is discussed. The experimental data are quantitatively described by a new microstructure-based model.
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Electric field structuring
4th International Conference on Electroceramics, ICE-2009, 13-17 December 2009, New Delhi, India, 114 (1), 108-118