Giant electrostrain coefficient under low driving electric field in sodium potassium niobate piezoelectric ceramics with symmetrical bipolar strain

Fuzhi Cao, Zhenyong Cen (), Ze Xu, Xin Zhang, Xiaoming Shi (), Houbing Huang, Zhaobo Liu, Yi-Xuan Liu, Xianxian Cai, Dongze Zhu, Ke Wang, Zhongshang Dou, Chaofeng Wu () and Nengneng Luo ()
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Fuzhi Cao: Environment and Materials, Guangxi University, MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, School of Resources
Zhenyong Cen: Environment and Materials, Guangxi University, MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, School of Resources
Ze Xu: Tsinghua University, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering
Xin Zhang: Tsinghua University, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering
Xiaoming Shi: University of Science and Technology Beijing, Department of Physics
Houbing Huang: Beijing Institute of Technology, Advanced Research Institute of Multidisciplinary Science
Zhaobo Liu: Beijing Institute of Technology, Advanced Research Institute of Multidisciplinary Science
Yi-Xuan Liu: Tsinghua University, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering
Xianxian Cai: Tsinghua University, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering
Dongze Zhu: Tsinghua University, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering
Ke Wang: Tsinghua University, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering
Zhongshang Dou: Wuzhen Laboratory, Research Center for Advanced Functional Ceramics
Chaofeng Wu: Tsinghua University, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering
Nengneng Luo: Environment and Materials, Guangxi University, MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials, Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, School of Resources

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Currently, achieving highly symmetrical bipolar strain and high electrostrain under low driving electric field remains challenging in piezoelectric materials. The designed potassium sodium niobate-based ceramics exhibit highly symmetrical bipolar strain and ultrahigh electrostrain coefficient (~2000 pm/V) under a low driving electric field of 8.4 kV/cm through A-site defect engineering and charge compensation. The highly symmetrical bipolar strain is related strongly to the lowly aligned defect dipoles by partially substituting A-site (Na+/K+) ions with Mn2+. The eye-catching performance is ascribed to the unique microstructure of atomic-scale polar nanoregions embedded in nano-domains (~34 nm) by tuning Na+/K+ ions deficiency and coexistence of multiple phases. Phase-field simulations reveal that flattened energy barrier and multiphase nanodomains interplay to boost electrostrain at low driving fields. This work provides an innovative way of designing lead-free piezoelectric materials with highly symmetrical bipolar strain and giant electrostrain coefficient at low driving electric field, promising for high-precision actuators applications.

Date: 2025
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DOI: 10.1038/s41467-025-65521-5

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