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Depoling and fatigue behavior of Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystal at megahertz frequencies under bipolar electric field.

Authors
  • Chen, Zhaojiang
  • Li, Shiyang
  • Zhang, Yang
  • Cao, Wenwu1
  • 1 Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Type
Published Article
Journal
Journal of Applied Physics
Publisher
AIP Publishing
Publication Date
May 07, 2017
Volume
121
Issue
17
Pages
174101–174101
Identifiers
DOI: 10.1063/1.4982895
PMID: 28502994
Source
Medline
Language
English
License
Unknown

Abstract

Bipolar electric field induced degradation in [001]c poled Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 (PMN-0.29PT) single crystals was investigated at megahertz frequencies. The electromechanical coupling factor kt , dielectric constant εr , dielectric loss D, and piezoelectric constant d33 were measured as a function of amplitude, frequency, and number of cycles of the applied electric field. Our results showed that samples degrade rapidly when the field amplitude is larger than a critical value due to the onset of domain switching. We define this critical value as the effective coercive field Ec at high frequencies, which increases drastically with frequency. We also demonstrate an effective counter-depoling method by using a dc bias, which could help the design of high field driven devices based on PMN-PT single crystals and operated at megahertz frequencies.

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