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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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

Cited 5 times inthomson ciCited 2 times inthomson ci
Title
Cycling stability of lead-free BNT-8BT and BNT-6BT-3KNN multilayer actuators and bulk ceramics
Author
Sapper, EvaGassmann, AndreaGjodvad, LarsJo, WookGranzow, TorstenRoedel, Juergen
Keywords
Bismuth sodium titanate; Fatigue; Lead-free; Multilayer actuator; Strain hysteresis
Issue Date
2014-03
Publisher
ELSEVIER SCI LTD
Citation
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, v.34, no.3, pp.653 - 661
Abstract
his study presents the electromechanical properties and cycling stability of lead-free piezoelectric materials 0.92(Bi1/2Na1/2)TiO3-0.08BaTiO(3) (BNT-8BT) and 0.91(Bi1/2Na1/2)TiO3-0.06BaTiO(3)-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 10(7) cycles. Furthermore, the frequency dependence of strain and the self-heating during cycling were investigated. The temperature increase is limited only to 2 degrees C in BNT-8BT MLA and 13 degrees C in BNT-6BT-3KNN MLA.
URI
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DOI
10.1016/j.jeurceramsoc.2013.09.006
ISSN
0955-2219
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MSE_Journal Papers
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