Enhanced Piezoelectric Properties and Thermal Stability in the (K0.5Na0.5)NbO3:ZnO Lead‐Free Piezoelectric Composites |
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| Authors: | Zhao Pan Jun Chen Longlong Fan Ji Zhang Shantao Zhang Yu Huang Laijun Liu Liang Fang Xianran Xing |
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| Affiliation: | 1. Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, China;2. Beijing Key Laboratory of Special Melting and Preparation of High‐End Metal Materials, Beijing, China;3. National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing, China;4. Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, Guilin University of Technology, Guilin, China |
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| Abstract: | The piezoelectric properties of (K0.5Na0.5)NbO3 (KNN) are normally enhanced by chemical substitutions or doping to form solid solutions. In this study, we report that the piezoelectric properties of KNN and thermal stability of piezoelectric coefficient d33 can be both enhanced by forming the composite of KNN:ZnO. The d33 of KNN:0.2ZnO can be improved to 110 pC/N by introducing the ZnO nanoparticles, which is better than the pure KNN (d33 = 85 pC/N). The Curie temperature (TC = 407°C) remains well comparable to the pure KNN (TC = 408°C). Furthermore, the thermal stability of both remanent polarization (Pr) and piezoelectric parameter (d33) is improved. The enhanced thermal stability could be related to the induced built‐in electric field or the enhanced sinterability by the addition of ZnO. The present results may help to optimize the piezoelectric properties of lead‐free materials by forming composite. |
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