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Effect of Ferroelectric Long-Range Order on the Unipolar and Bipolar Electric Fatigue in Bi1/2Na1/2TiO3-Based Lead-Free Piezoceramics

Luo, Zhenhua and Granzow, Torsten and Glaum, Julia and Jo, Wook and Rödel, Jürgen and Hoffman, Mark (2011):
Effect of Ferroelectric Long-Range Order on the Unipolar and Bipolar Electric Fatigue in Bi1/2Na1/2TiO3-Based Lead-Free Piezoceramics.
In: Journal of the American Ceramic Society, pp. 3927-3933, 94, (11), ISSN 00027820,
[Online-Edition: http://dx.doi.org/10.1111/j.1551-2916.2011.04605.x],
[Article]

Abstract

The fatigue behavior of the lead-free piezoelectric Bi1/2Na1/2TiO3–BaTiO3−K0.5Na0.5NbO3 (BNT-BT-KNN) under bipolar and unipolar electrical loading is investigated. Special attention is paid to the effect of a decreasing ferroelectric order which was affected by an increase in KNN-content. It is found that, in mainly ferroelectric systems with low KNN-content, bipolar cycling leads to domain wall pinning and formation of microcracks, while in mainly non-ferroelectric systems with high KNN-content fatigue can be rationalized by the repeated field-induced phase transition occurring during each field cycle. Under unipolar load, fatigue in low-KNN systems is dominated by domain wall pinning and the formation of a space charge field. Only the latter effect is present in non-ferroelectric high-KNN systems, which fatigue to a smaller degree.

Item Type: Article
Erschienen: 2011
Creators: Luo, Zhenhua and Granzow, Torsten and Glaum, Julia and Jo, Wook and Rödel, Jürgen and Hoffman, Mark
Title: Effect of Ferroelectric Long-Range Order on the Unipolar and Bipolar Electric Fatigue in Bi1/2Na1/2TiO3-Based Lead-Free Piezoceramics
Language: English
Abstract:

The fatigue behavior of the lead-free piezoelectric Bi1/2Na1/2TiO3–BaTiO3−K0.5Na0.5NbO3 (BNT-BT-KNN) under bipolar and unipolar electrical loading is investigated. Special attention is paid to the effect of a decreasing ferroelectric order which was affected by an increase in KNN-content. It is found that, in mainly ferroelectric systems with low KNN-content, bipolar cycling leads to domain wall pinning and formation of microcracks, while in mainly non-ferroelectric systems with high KNN-content fatigue can be rationalized by the repeated field-induced phase transition occurring during each field cycle. Under unipolar load, fatigue in low-KNN systems is dominated by domain wall pinning and the formation of a space charge field. Only the latter effect is present in non-ferroelectric high-KNN systems, which fatigue to a smaller degree.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 94
Number: 11
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis > Subproject A1: Manufacturing of ceramic, textured actuators with high strain
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties > Subproject D1: Mesoscopic and macroscopic fatigue in doped ferroelectric ceramics
11 Department of Materials and Earth Sciences > Material Science
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
11 Department of Materials and Earth Sciences
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 11 Nov 2011 08:15
Official URL: http://dx.doi.org/10.1111/j.1551-2916.2011.04605.x
Additional Information:

SFB 595 Cooperation A1, D1

Identification Number: doi:10.1111/j.1551-2916.2011.04605.x
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