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The thermal stability and fatigue resistance of piezoelectric ceramics are of great importance for industrialized application. In this study, the electrical properties of (0.99-x)(K0.48Na0.52)(Nb0.975Sb0.025)O3- 0.01CaZrO3-x(Bi0.5Na0.5)HfO3 ceramics are investigated. When x = 0.03, the ceramics exhibit the optimal electrical properties at room temperature and high Curie temperature (TC = 253 ℃). In addition, the ceramic has outstanding thermal stability (d3*3 ≈ 301 pm/V at 160 ℃) and fatigue resistance (variation of Pr and d3*3 ~10% after 104 electrical cycles). Subsequently, the defect configuration and crystal structure of the ceramics are studied by X-ray diffraction, temperature- dielectric property curves and impedance analysis. On one hand, the doping (Bi0.5Na0.5)HfO3 makes the dielectric constant peaks flatten. On the other hand, the defect concentration and migration are obviously depressed in the doped ceramics. Both of them can enhance the piezoelectrical properties and improve the temperature and cycling reliabilities. The present study reveals that the good piezoelectric properties can be obtained in 0.96(K0.48Na0.52)(Nb0.975Sb0.025)O3-0.01CaZrO3-0.03(Bi0.5Na0.5) HfO3 ceramics.


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Enhanced thermal and cycling reliabilities in (K,Na)(Nb,Sb)O3-CaZrO3-(Bi,Na)HfO3 ceramics

Show Author's information Yi FANaZhenxing WANGaYu HUANa( )Tao WEIa( )Xiaohui WANGb
School of Material Science and Engineering, University of Jinan, Jinan 250022, China
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

† Yi Fan and Zhenxing Wang contributed equally to this work.

Abstract

The thermal stability and fatigue resistance of piezoelectric ceramics are of great importance for industrialized application. In this study, the electrical properties of (0.99-x)(K0.48Na0.52)(Nb0.975Sb0.025)O3- 0.01CaZrO3-x(Bi0.5Na0.5)HfO3 ceramics are investigated. When x = 0.03, the ceramics exhibit the optimal electrical properties at room temperature and high Curie temperature (TC = 253 ℃). In addition, the ceramic has outstanding thermal stability (d3*3 ≈ 301 pm/V at 160 ℃) and fatigue resistance (variation of Pr and d3*3 ~10% after 104 electrical cycles). Subsequently, the defect configuration and crystal structure of the ceramics are studied by X-ray diffraction, temperature- dielectric property curves and impedance analysis. On one hand, the doping (Bi0.5Na0.5)HfO3 makes the dielectric constant peaks flatten. On the other hand, the defect concentration and migration are obviously depressed in the doped ceramics. Both of them can enhance the piezoelectrical properties and improve the temperature and cycling reliabilities. The present study reveals that the good piezoelectric properties can be obtained in 0.96(K0.48Na0.52)(Nb0.975Sb0.025)O3-0.01CaZrO3-0.03(Bi0.5Na0.5) HfO3 ceramics.

Keywords:

(Na,K)NbO3 (KNN)-based ceramics, thermal stability, fatigue resistance, crystal structure, defect structure
Received: 19 December 2019 Revised: 09 March 2020 Accepted: 10 March 2020 Published: 05 June 2020 Issue date: June 2020
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Publication history
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Publication history

Received: 19 December 2019
Revised: 09 March 2020
Accepted: 10 March 2020
Published: 05 June 2020
Issue date: June 2020

Copyright

© The Author(s) 2020

Acknowledgements

The study was supported by National Natural Science Foundation of China (Grant Nos. 51702119, 51702122, and 51972146).

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