Semiconductor/relaxor 0–3 type composites without thermal depolarization in Bi0.5Na0.5TiO3-based lead-free piezoceramics

Ji Zhang, Zhao Pan, Fei-Fei Guo, Wen-Chao Liu, Huanpo Ning, Y. B. Chen, Ming-Hui Lu, Bin Yang, Jun Chen (), Shan-Tao Zhang (), Xianran Xing, Jürgen Rödel, Wenwu Cao and Yan-Feng Chen
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Ji Zhang: College of Engineering and Applied Science, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Zhao Pan: University of Science and Technology Beijing
Fei-Fei Guo: Condensed Matter Science and Technology Institute, Harbin Institute of Technology
Wen-Chao Liu: College of Engineering and Applied Science, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Huanpo Ning: School of Engineering and Materials Science, Queen Mary University of London
Y. B. Chen: Nanjing University
Ming-Hui Lu: College of Engineering and Applied Science, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Bin Yang: Condensed Matter Science and Technology Institute, Harbin Institute of Technology
Jun Chen: University of Science and Technology Beijing
Shan-Tao Zhang: College of Engineering and Applied Science, Collaborative Innovation Center of Advanced Microstructures, Nanjing University
Xianran Xing: University of Science and Technology Beijing
Jürgen Rödel: Institute of Materials Science, Technische Universität Darmstadt
Wenwu Cao: Condensed Matter Science and Technology Institute, Harbin Institute of Technology
Yan-Feng Chen: College of Engineering and Applied Science, Collaborative Innovation Center of Advanced Microstructures, Nanjing University

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: Abstract Commercial lead-based piezoelectric materials raised worldwide environmental concerns in the past decade. Bi0.5Na0.5TiO3-based solid solution is among the most promising lead-free piezoelectric candidates; however, depolarization of these solid solutions is a longstanding obstacle for their practical applications. Here we use a strategy to defer the thermal depolarization, even render depolarization-free Bi0.5Na0.5TiO3-based 0–3-type composites. This is achieved by introducing semiconducting ZnO particles into the relaxor ferroelectric 0.94Bi0.5Na0.5TiO3–0.06BaTiO3 matrix. The depolarization temperature increases with increasing ZnO concentration until depolarization disappears at 30 mol% ZnO. The semiconducting nature of ZnO provides charges to partially compensate the ferroelectric depolarization field. These results not only pave the way for applications of Bi0.5Na0.5TiO3-based piezoceramics, but also have great impact on the understanding of the mechanism of depolarization so as to provide a new design to optimize the performance of lead-free piezoelectrics.

Date: 2015
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DOI: 10.1038/ncomms7615

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