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Electromechanical properties of CaZrO3 modified (K,Na)NbO3- based lead-free piezoceramics under uniaxial stress conditions

Wang, Ke and Yao, Fang-Zhou and Koruza, Jurij and Cheng, Li-Qian and Schader, Florian H. and Zhang, Mao-Hua and Rödel, Jürgen and Li, Jing-Feng and Webber, Kyle G. (2017):
Electromechanical properties of CaZrO3 modified (K,Na)NbO3- based lead-free piezoceramics under uniaxial stress conditions.
100, In: Journal of the American Ceramic Society, (5), pp. 2116-2122, ISSN 0002-7820, [Article]

Abstract

Piezoelectric actuators are typically preloaded with a modest mechanical compressive stress during actuation to reduce cracking and allow for operation in the dynamic range. In addition, actuators are required to carry out mechanical work during operation, resulting in a nonlinear relationship between stress and actuation voltage. In fact, mechanical loading can significantly impact the electromechanical performance of lead-free piezoelectrics. Herein, we report the dependence of electromechanical properties of CaZrO3 modified (K,Na)NbO3-based lead-free piezoceramics on uniaxial compressive stress, comparing to their lead-based counterparts. It is demonstrated that increased non-180° domain switching enhances the strain output at a moderate stress of approximately -50 MPa from room temperature to 150°C. Larger uniaxial stress, however, is found to suppress ferroelectric domain switching, resulting in the continuous strain and polarization decrease.

Item Type: Article
Erschienen: 2017
Creators: Wang, Ke and Yao, Fang-Zhou and Koruza, Jurij and Cheng, Li-Qian and Schader, Florian H. and Zhang, Mao-Hua and Rödel, Jürgen and Li, Jing-Feng and Webber, Kyle G.
Title: Electromechanical properties of CaZrO3 modified (K,Na)NbO3- based lead-free piezoceramics under uniaxial stress conditions
Language: English
Abstract:

Piezoelectric actuators are typically preloaded with a modest mechanical compressive stress during actuation to reduce cracking and allow for operation in the dynamic range. In addition, actuators are required to carry out mechanical work during operation, resulting in a nonlinear relationship between stress and actuation voltage. In fact, mechanical loading can significantly impact the electromechanical performance of lead-free piezoelectrics. Herein, we report the dependence of electromechanical properties of CaZrO3 modified (K,Na)NbO3-based lead-free piezoceramics on uniaxial compressive stress, comparing to their lead-based counterparts. It is demonstrated that increased non-180° domain switching enhances the strain output at a moderate stress of approximately -50 MPa from room temperature to 150°C. Larger uniaxial stress, however, is found to suppress ferroelectric domain switching, resulting in the continuous strain and polarization decrease.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 100
Number: 5
Uncontrolled Keywords: electromechanical properties, lead-free ceramics, niobium/niobium compounds, piezoelectric materials/ properties, stress
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 11 May 2017 07:10
Identification Number: doi:10.1111/jace.14661
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