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Large electric-field-induced strain in ferroelectric crystals by point-defect-mediated reversible domain switching

Large electric-field-induced strain in ferroelectric crystals by point-defect-mediated reversible... Ferroelectric crystals are characterized by their asymmetric or polar structures. In an electric field, ions undergo asymmetric displacement and result in a small change in crystal dimension, which is proportional to the applied field 1,2 . Such electric-field-induced strain (or piezoelectricity) has found extensive applications in actuators and sensors 2 . However, the effect is generally very small and thus limits its usefulness. Here I show that with a different mechanism, an aged BaTiO3 single crystal can generate a large recoverable nonlinear strain of 0.75% at a low field of 200 V mm−1. At the same field this value is about 40 times higher than piezoelectric Pb(Zr, Ti)O3 (PZT) ceramics and more than 10 times higher than the high-strain Pb(Zn1/3Nb2/3)O3–PbTiO3 (PZN-PT) single crystals 3,4,5 . This large electro-strain stems from an unusual reversible domain switching (most importantly the switching of non-180° domains) in which the restoring force is provided by a general symmetry-conforming property of point defects. This mechanism provides a general method to achieve large electro-strain effect in a wide range of ferroelectric systems and the effect may lead to novel applications in ultra-large stroke and nonlinear actuators. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Materials Springer Journals

Large electric-field-induced strain in ferroelectric crystals by point-defect-mediated reversible domain switching

Ren, Xiaobing
Nature Materials , Volume 3 (2) – Jan 11, 2004
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References (24)

Publisher
Springer Journals
Copyright
Copyright © 2004 by Nature Publishing Group
Subject
Materials Science; Materials Science, general; Optical and Electronic Materials; Biomaterials; Nanotechnology; Condensed Matter Physics
ISSN
1476-1122
eISSN
1476-4660
DOI
10.1038/nmat1051
Publisher site
See Article on Publisher Site

Abstract

Ferroelectric crystals are characterized by their asymmetric or polar structures. In an electric field, ions undergo asymmetric displacement and result in a small change in crystal dimension, which is proportional to the applied field 1,2 . Such electric-field-induced strain (or piezoelectricity) has found extensive applications in actuators and sensors 2 . However, the effect is generally very small and thus limits its usefulness. Here I show that with a different mechanism, an aged BaTiO3 single crystal can generate a large recoverable nonlinear strain of 0.75% at a low field of 200 V mm−1. At the same field this value is about 40 times higher than piezoelectric Pb(Zr, Ti)O3 (PZT) ceramics and more than 10 times higher than the high-strain Pb(Zn1/3Nb2/3)O3–PbTiO3 (PZN-PT) single crystals 3,4,5 . This large electro-strain stems from an unusual reversible domain switching (most importantly the switching of non-180° domains) in which the restoring force is provided by a general symmetry-conforming property of point defects. This mechanism provides a general method to achieve large electro-strain effect in a wide range of ferroelectric systems and the effect may lead to novel applications in ultra-large stroke and nonlinear actuators.

Journal

Nature Materials – Springer Journals

Published: Jan 11, 2004

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