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Large piezoelectric strains from polarization graded ferroelectrics S. Zhong, Z.-G. Ban,a

Summary: Large piezoelectric strains from polarization graded ferroelectrics
S. Zhong, Z.-G. Ban,a
and S. P. Alpayb
Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269
J. V. Mantese
Delphi Research Laboratories, Shelby Township, Michigan 48315
Received 25 July 2006; accepted 19 August 2006; published online 5 October 2006
The potential applications of polarization graded ferroelectrics as high performance sensors and
actuators are theoretically investigated. A static bending can be expected in polarization graded
ferroelectric plates, forming a vertical displacement. This is due to the built-in strain gradient that
arises from the grading of the composition and concomitantly, the spontaneous self-strain.
Numerical results of two compositionally graded ferroelectrics, BaTiO3­Ba1-xSrxTiO3 and
PbTiO3­Pb1-xZrxTiO3, show a high dynamic response of the displacement under an external
electric field, yielding as much as 23% strain at 50 kV/cm in PbTiO3­Pb0.6Zr0.4TiO3, which is
comparable to large displacement actuators formed from ceramic/ceramic and ceramic/metal
multilayer mesomaterials. © 2006 American Institute of Physics. DOI: 10.1063/1.2358963
Sensors and actuators are integral components in smart
systems. They can be used to both sense and respond to
external stimuli, such as pressure, temperature, voltage, and
electric and magnetic fields. Over the past decade, ferroelec-


Source: Alpay, S. Pamir - Department of Materials Science and Engineering, University of Connecticut


Collections: Materials Science