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Cycling stability of lead-free BNT–8BT and BNT–6BT–3KNN multilayer actuators and bulk ceramics

Sapper, Eva and Gassmann, Andrea and Gjødvad, Lars and Jo, Wook and Granzow, Torsten and Rödel, Jürgen (2014):
Cycling stability of lead-free BNT–8BT and BNT–6BT–3KNN multilayer actuators and bulk ceramics.
In: Journal of the European Ceramic Society, pp. 653-661, 34, (3), ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2013.09.006],
[Article]

Abstract

This study presents the electromechanical properties and cycling stability of lead-free piezoelectric materials 0.92(Bi1/2Na1/2)TiO3–0.08BaTiO3 (BNT–8BT) and 0.91(Bi1/2Na1/2)TiO3–0.06BaTiO3–0.03(K0.5Na0.5)NbO3 (BNT–6BT–3KNN). Both bulk samples as well as multilayer actuators (MLA) with internal Ag/Pd (70/30) electrodes were successfully processed from both materials. Electromechanical characteristics in the non-fatigued state and after different numbers of unipolar fatigue cycles are provided, representing the first direct comparison of the fatigue resistance of lead-free bulk ceramics and the corresponding MLAs. At a maximum field of 6 kV/mm and a frequency of 50 Hz, BNT–8BT MLA delivered a maximum strain of 0.07% and displayed excellent cycling stability. BNT–6BT–3KNN MLA provided a higher strain of 0.15% initially but degraded during cycling and exhibited break down after 107 cycles. Furthermore, the frequency dependence of strain and the self-heating during cycling were investigated. The temperature increase is limited only to 2 °C in BNT–8BT MLA and 13 °C in BNT–6BT–3KNN MLA.

Item Type: Article
Erschienen: 2014
Creators: Sapper, Eva and Gassmann, Andrea and Gjødvad, Lars and Jo, Wook and Granzow, Torsten and Rödel, Jürgen
Title: Cycling stability of lead-free BNT–8BT and BNT–6BT–3KNN multilayer actuators and bulk ceramics
Language: English
Abstract:

This study presents the electromechanical properties and cycling stability of lead-free piezoelectric materials 0.92(Bi1/2Na1/2)TiO3–0.08BaTiO3 (BNT–8BT) and 0.91(Bi1/2Na1/2)TiO3–0.06BaTiO3–0.03(K0.5Na0.5)NbO3 (BNT–6BT–3KNN). Both bulk samples as well as multilayer actuators (MLA) with internal Ag/Pd (70/30) electrodes were successfully processed from both materials. Electromechanical characteristics in the non-fatigued state and after different numbers of unipolar fatigue cycles are provided, representing the first direct comparison of the fatigue resistance of lead-free bulk ceramics and the corresponding MLAs. At a maximum field of 6 kV/mm and a frequency of 50 Hz, BNT–8BT MLA delivered a maximum strain of 0.07% and displayed excellent cycling stability. BNT–6BT–3KNN MLA provided a higher strain of 0.15% initially but degraded during cycling and exhibited break down after 107 cycles. Furthermore, the frequency dependence of strain and the self-heating during cycling were investigated. The temperature increase is limited only to 2 °C in BNT–8BT MLA and 13 °C in BNT–6BT–3KNN MLA.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 34
Number: 3
Uncontrolled Keywords: Bismuth sodium titanate; Lead-free; Multilayer actuator; Strain hysteresis; Fatigue
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Electronic Materials
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Zentrale Einrichtungen
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue
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
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
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > D - Component properties > Subproject D4: Fatigue of organic electronic devices
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 595: Electrical fatigue > A - Synthesis
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio)
Date Deposited: 02 Dec 2013 09:28
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2013.09.006
Additional Information:

SFB 595 Cooperation A1, D1, D4

Identification Number: doi:10.1016/j.jeurceramsoc.2013.09.006
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