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Large Strain in Relaxor/Ferroelectric Composite Lead-Free Piezoceramics

Zhang, Haibo and Groh, Claudia and Zhang, Qi and Jo, Wook and Webber, Kyle G. and Rödel, Jürgen (2015):
Large Strain in Relaxor/Ferroelectric Composite Lead-Free Piezoceramics.
In: Advanced Electronic Materials, pp. n/a-n/a, ISSN 2199160X, [Online-Edition: http://dx.doi.org/10.1002/aelm.201500018],
[Article]

Abstract

A lead-free relaxor (RE)/ferroelectric (FE) 0–3 composite was developed with a large strain that resulted from the electric-field-induced ergodic relaxor-to-ferroelectric phase transition at a relatively low operational field of 4 kV mm−1. The composite comprised of 70 vol% 0.91Bi1/2Na1/2TiO3–0.06BaTiO3–0.03AgNbO3 RE matrix and 30 vol% 0.93Bi1/2Na1/2TiO3–0.07BaTiO3 FE seed shows a normalized strain, , of 824 pm V−1 at room temperature. In order to explore the underlying mechanism of this composite effect, two multilayer ceramics with alternating RE and FE layers are also prepared, one with the layers parallel (polarization-coupled multilayer) and the other with the layers perpendicular (strain-coupled multilayer) to the electroded surfaces. It is found that in addition to polarization coupling, the strain coupling effect also plays a critical role in the reduction of the RE–FE phase transition field. The switching dynamics is highlighted with time-dependent piezoforce microscopy in the vicinity of the FE/RE interface.

Item Type: Article
Erschienen: 2015
Creators: Zhang, Haibo and Groh, Claudia and Zhang, Qi and Jo, Wook and Webber, Kyle G. and Rödel, Jürgen
Title: Large Strain in Relaxor/Ferroelectric Composite Lead-Free Piezoceramics
Language: English
Abstract:

A lead-free relaxor (RE)/ferroelectric (FE) 0–3 composite was developed with a large strain that resulted from the electric-field-induced ergodic relaxor-to-ferroelectric phase transition at a relatively low operational field of 4 kV mm−1. The composite comprised of 70 vol% 0.91Bi1/2Na1/2TiO3–0.06BaTiO3–0.03AgNbO3 RE matrix and 30 vol% 0.93Bi1/2Na1/2TiO3–0.07BaTiO3 FE seed shows a normalized strain, , of 824 pm V−1 at room temperature. In order to explore the underlying mechanism of this composite effect, two multilayer ceramics with alternating RE and FE layers are also prepared, one with the layers parallel (polarization-coupled multilayer) and the other with the layers perpendicular (strain-coupled multilayer) to the electroded surfaces. It is found that in addition to polarization coupling, the strain coupling effect also plays a critical role in the reduction of the RE–FE phase transition field. The switching dynamics is highlighted with time-dependent piezoforce microscopy in the vicinity of the FE/RE interface.

Journal or Publication Title: Advanced Electronic Materials
Uncontrolled Keywords: electric-field-induced phase transition; normalized strain; polarization coupling; relaxor-ferroelectric ceramic composites; strain coupling
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science > Elektromechanik von Oxiden
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
Date Deposited: 24 Apr 2015 08:08
Official URL: http://dx.doi.org/10.1002/aelm.201500018
Identification Number: doi:10.1002/aelm.201500018
Funders: H.Z. thanks the Alexander-von-Humboldt foundation for generous funding and also the generous support by the National Natural Science Foundation of China under Grant No. 51202074., C.G. acknowledges fi nancial support from the Hesse state centre AdRIA on adaptronics., K.G.W. gratefully acknowledges fi nancial support from the Deutsche Forschungsgemeinschaft under WE Grant No. 4972/2–1.
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