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Effects of reversible and irreversible ferroelectric switchings on the piezoelectric large-signal response of lead zirconate titanate thin films

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4 Author(s)
Gerber, P. ; Institute of Materials in Electrical Engineering and Information Technology 2, (IWE2), Aachen University, D-52074 Aachen, Germany ; Kugeler, C. ; Bottger, U. ; Waser, R.

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The effects of reversible and irreversible switching processes on the electromechanical large-signal strain S of tetragonal Pb(Zrx,Ti1-x)O3 thin films are investigated and discussed. Starting from electric small- and large-signal measurements, the percentage of switched unit cells cesw is calculated. The result is then used in combination with the measured electromechanical field-induced small-signal response to calculate the field-induced large-signal strain S. Enhanced models for this calculation are developed improving a known model. Differences between the calculated and measured large-signal strains are discussed in respect to parameter influences and irreversible contributions. In addition, detailed insight on the switching processes in respect to the electromechanical properties is given.

Published in:

Journal of Applied Physics  (Volume:98 ,  Issue: 12 )

Date of Publication:

Dec 2005

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