Abstract
In this work, we introduced ZnO through hydrothermal reaction to improve the breakdown strength and piezoelectric properties of potassium-sodium niobate (KNN) ceramics. The impact of ZnO synthesized at different reaction times on the structure, breakdown strength, dielectric performance, and piezoelectric performance of 0.9KNN-0.1ZnO ceramics was investigated. The findings reveal that the KNN ceramics incorporating ZnO exhibit a dense microstructure, reduced grain size, enhanced breakdown strength, and piezoelectric performance. Notably, the breakdown field strength of KNN-Z-3 ceramic significantly increased to 7.42 kV/mm, exhibiting an 80.98 % improvement compared to KNN ceramics (4.10 kV/mm). Furthermore, the d33 value of the KNN-Z-3 ceramic also had a significant increase, reaching 104 pC/N, having a 30 % enhancement compared to KNN ceramics (80 pC/N). Such enhancement is ascribed to the increased piezoelectric response due to the stress bending between KNN and ZnO as well as adjacent domains.
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