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Uniaxial Compressive Stress Dependence of the High-Field Dielectric and Piezoelectric Performance of Soft PZT Piezoceramics

Published online by Cambridge University Press:  03 March 2011

Dayu Zhou ,
Marc Kamlah  and
Dietrich Munz
Dayu Zhou*
Affiliation:
Forschungszentrum Karlsruhe, Institut fuer Materialforschung II, D-76021 Karlsruhe, Germany
Marc Kamlah
Affiliation:
Forschungszentrum Karlsruhe, Institut fuer Materialforschung II, D-76021 Karlsruhe, Germany
Dietrich Munz
Affiliation:
Forschungszentrum Karlsruhe, Institut fuer Materialforschung II, D-76021 Karlsruhe, Germany
*
a) Address all correspondence to this author.e-mail: dayu.zhou@imf.fzk.de
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Abstract

The influence of uniaxial prestress on dielectric and piezoelectric performance was studied for soft lead zirconate titanate piezoceramics. High electric field induced polarization and longitudinal/transverse strain were measured at different compression preload levels of up to −400 MPa. The parameters evaluated included polarization/strain outputs, dielectric permittivity, piezoelectric constants, and dissipation energy as a function of the mechanical preload and electric-field strength. The results indicate a significant enhancement of the dielectric and piezoelectric performance within a certain prestress loading range. At much higher stress levels, the predominant mechanical depolarization effect makes the material exhibit hardly any piezoeffect. However, the enhanced performance achieved by a small stress preload is accompanied by an unfavorable increased hysteresis, and consequently, increased energy loss, which is attributed to a larger extrinsic contribution due to more non-180° domain switching induced by the combined electromechanical load.

Keywords

PiezoelectricPiezoresponseDielectric properties
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 3 , March 2004 , pp. 834 - 842
Copyright
Copyright © Materials Research Society 2004

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