Contribution of irreversible non-180° domain to performance for multiphase coexisted potassium sodium niobate ceramics

Bo Wu, Lin Zhao, Jiaqing Feng, Yiting Zhang, Xilong Song, Jian Ma, Hong Tao (), Ze Xu, Yi-Xuan Liu, Shidong Wang (), Jingtong Lu, Fangyuan Zhu, Bing Han () and Ke Wang ()
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Bo Wu: Southwest Minzu University
Lin Zhao: Southwest Minzu University
Jiaqing Feng: Southwest Minzu University
Yiting Zhang: Southwest Minzu University
Xilong Song: Southwest Minzu University
Jian Ma: Southwest Minzu University
Hong Tao: Southwest Minzu University
Ze Xu: School of Materials Science and Engineering, Tsinghua University
Yi-Xuan Liu: School of Materials Science and Engineering, Tsinghua University
Shidong Wang: Peking University People’s Hospital
Jingtong Lu: School of Materials Science and Engineering, Tsinghua University
Fangyuan Zhu: Shanghai Advanced Research Institute, Chinese Academy of Sciences
Bing Han: Peking University School and Hospital of Stomatology
Ke Wang: School of Materials Science and Engineering, Tsinghua University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Despite the dominance of lead-based piezoelectric materials with ultrahigh electric-field-induced strain in actuating applications, seeking eco-friendly substitutes with an equivalent performance remains an urgent demand. Here, a strategy of regulating the irreversible non-180° domain via phase engineering is introduced to optimize the available strain (the difference between the maximum strain and the remnant strain in a unipolar strain curve) in the lead-free potassium–sodium niobate-based piezoelectric ceramics. In situ synchrotron X-ray diffraction and Rayleigh analysis reveal the contribution of the non-180° domain to available strain in the tetragonal–orthorhombic–rhombohedral phase boundary. The reducing orthorhombic phase and increasing rhombohedral/tetragonal phase accompanied by the reduced irreversible non-180° domain are obtained with increasing doping of Sb5+, resulting in an enlarged available strain due to the significantly lowered remnant strain. This optimization is mainly attributed to the reduced irreversible non-180° domain wall motion and the increased lattice distortion, which are beneficial to decrease extrinsic contribution and enhance intrinsic contribution. The mesoscopic structure of miniaturized nanosized domain with facilitated domain switching also contributes to the enhancement of available strain due to the improved random field and decreased energy barrier. The study will shed light on the design of lead-free high-performance piezoelectric ceramics for actuator applications.

Date: 2024
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DOI: 10.1038/s41467-024-46800-z

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