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Proceedings Paper

Creeping polarization and remanent strain in ferroelectrics under uniaxial electromechanical loading
Author(s): Q. D. Liu; J. E. Huber
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Paper Abstract

The time-dependent remanent strain and polarization were measured in initially unpoled PZT-855 under electromechanical loads. Various levels of constant compressive uniaxial stress combined with constant electric field parallel to the stress axis were used to produce the creeping remanent strain and polarization. The remanent quantities were deduced from measurements of total strain and electric displacement by subtracting the linear (reversible) parts of strain and electric displacement, making use of previous measurements of the linear moduli and accounting for their variation with material state. Mechanical compressive stresses alone produce remanent strains that rapidly reach a saturated state. Under combined loading, increasing the compressive stress reduces the observed creep rates caused by an additional electrical loading. The creep behaviour is most significant at loads close to the coercive stress or electric field. At loads well above or below the coercive field levels, the behaviour is nearly rate-independent.

Paper Details

Date Published: 17 April 2007
PDF: 7 pages
Proc. SPIE 6526, Behavior and Mechanics of Multifunctional and Composite Materials 2007, 652604 (17 April 2007); doi: 10.1117/12.713608
Show Author Affiliations
Q. D. Liu, Univ. of Cambridge (United Kingdom)
J. E. Huber, Univ. of Oxford (United Kingdom)


Published in SPIE Proceedings Vol. 6526:
Behavior and Mechanics of Multifunctional and Composite Materials 2007
Marcelo J. Dapino, Editor(s)

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