Liu, Y., Bian, L., Zhang, R., Fan, J., Huo, D., Shen, B., Huang, H., Shi, X., Wang, D., & Yao, K. (2024). Ultrahigh electromechanical response in (K,Na)NbO3-based lead-free textured piezoceramics. Applied Physics Reviews, 11(3). https://doi.org/10.1063/5.0224215
Abstract:
The progress of next-generation electromechanical devices is substantially reliant upon achieving high electromechanical coupling performance in piezoelectric materials. Here, a local stress regulation strategy is introduced to significantly enhance the overall electromechanical response of lead-free piezoceramics. A remarkable large piezoelectric coefficient (d33) of ∼800 pC N−1 and longitudinal electromechanical coupling factor (k33) of 88% are obtained in (K,Na)NbO3 (KNN)-based textured piezoceramics. From both experimental examinations and theoretical simulation, including phase-field analyses, it is found that the improved piezoelectric performance primarily stems from the stress-induced elastic field aligned with the preferred crystallographic orientation, which constrains the domain size, resulting in nanoscale short-range ordered domain structures. Such structures facilitate the flexible rotation of electric dipoles within coexisting phases due to flattened free energy distribution, thereby leading to the exceptionally large piezoelectric response. This understanding provides valuable guidance for the design of novel lead-free piezoceramics with excellent piezoelectric performance.
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Publisher Copyright
Funding Info:
This research / project is supported by the A*STAR - Advanced Manufacturing and Engineering (AME) Programmatic Fund
Grant Reference no. : A20G9b0135
Description:
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Liu, Y., Bian, L., Zhang, R., Fan, J., Huo, D., Shen, B., Huang, H., Shi, X., Wang, D., & Yao, K. (2024). Ultrahigh electromechanical response in (K,Na)NbO3-based lead-free textured piezoceramics. Applied Physics Reviews, 11(3). https://doi.org/10.1063/5.0224215
and may be found at https://doi.org/10.1063/5.0224215