Synergetic Contributions in Phase Boundary Engineering to the Piezoelectricity of Potassium Sodium Niobate Lead-Free Piezoceramics
Type
ArticleKAUST Department
Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 239955, Kingdom of Saudi Arabia.Physical Science and Engineering (PSE) Division
Material Science and Engineering Program
Date
2020-08-04Online Publication Date
2020-08-04Print Publication Date
2020-09-02Embargo End Date
2021-08-04Permanent link to this record
http://hdl.handle.net/10754/664513
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Although the pronounced piezoelectricity was obtained in (K, Na)NbO3 piezoceramics with the phase boundary engineering (PBE), the physical mechanisms remain pending. Here we revealed for the first time how PBE influences the piezoelectric properties through synergetic contributions. Cryogenic experiments confirm that PBE constructs a phase coexistence, consisting of rhombohedral (R), orthorhombic (O), and tetragonal (T) phases, with a structural softening, by which a high piezoelectric coefficient d33 of 555 pC/N and the enhanced temperature stability of strain are achieved. The phenomenological theory and transmission electron microscope demonstrate that the superior d33 hinges on the flattened Gibbs free energy and the abundant nano-domains (10-80 nm), which respectively induce the enhanced permittivity and the coexisting single-domain and multi-domain zones. In particular, we disclosed a trade-off relationship between ferroelectric domains and polarnanoregions (PNRs) and found the “double-edged sword” role of PNRs in the piezoelectricity enhancement. Therefore, this work helps understand the physical mechanisms of the piezoelectricity enhancement, benefiting the future research of lead-free piezoceramics.Citation
Lv, X., Zhang, J., Liu, Y., Li, F., Zhang, X., & Wu, J. (2020). Synergetic Contributions in Phase Boundary Engineering to the Piezoelectricity of Potassium Sodium Niobate Lead-Free Piezoceramics. ACS Applied Materials & Interfaces. doi:10.1021/acsami.0c12424Sponsors
The authors gratefully acknowledge the support of the National Natural Science Foundation of China (Nos. 51722208 and 51972215) and the Key Technologies Research and Development Program of Sichuan Province (No. 2018JY0007). Dr. X. Lv and Dr. J. Zhang contributed equally to this work.Publisher
American Chemical Society (ACS)Additional Links
https://pubs.acs.org/doi/10.1021/acsami.0c12424ae974a485f413a2113503eed53cd6c53
10.1021/acsami.0c12424