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Influence of electrical cycling on polarization reversal processes in Pb(Zn1/3Nb2/3)O3-PbTiO3 ferroelectric single crystals as a function of orientation

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3 Author(s)
Ozgul, Metin ; Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802-4800 ; Trolier-McKinstry, Susan ; Randall, Clive A.

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Pb(Zn1/3Nb2/3)O3-PbTiO3 (PZN-PT) ferroelectric single crystals with rhombohedral symmetry demonstrate a wide variety of anisotropic behavior under both unipolar and bipolar electrical switching. Specifically, PZN-4.5%PT crystals demonstrate exceptional polarization switching fatigue resistance along [001]C (C: pseudocubic), as opposed to normal fatigue in [111]C directions in the rhombohedral ferroelectric state [Takemura etal, J. Appl. Phys. 88, 7272 (2000)]. The influence of prior exposure to electrical cycling on polarization switching as a function of electric field and driving frequency was studied in both orientations. The field and frequency dependence of switching polarization can be described by a power law, in which greater electrical field strength and frequency dependence are shown for [111]C crystals. As fatigue evolves in the [111]C orientation, higher electric fields are required for switching due to the changes in microscopic switching mechanisms and buildup of local internal electric fields. However, negligible changes are observed in [001]C-oriented crystals as a function of cycling. These differences are consistent with switching current and strain-field analyses. From strain-field data, asymmetry can be detected in bipolar strain loops accompanying the suppression of the polarization-electric-field switching. The asymmetry is localized, as noted by region-to-region changes in strain-field loops across the surface of the [111]C PZN-PT crystals. © 2004 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:95 ,  Issue: 8 )

Date of Publication:

Apr 2004

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