Utilization of Nonstoichiometric Nb5+ to Optimize Comprehensive Electrical Properties of KNN-Based Ceramics

An easy approach is suggested to obtain excellent piezoelectric performances in potassium sodium niobate (KNN)-based ceramics simultaneously with low dielectric loss (tanδ), high Curie temperature (T C), and electromechanical coupling factor (k p). Herein, a KNN-based ceramics system with nonstoichi...

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Bibliographic Details
Published in:Inorganic chemistry 2022-11, Vol.61 (46), p.18660-18669
Main Authors: Li, Hongjiang, Xie, Lixu, Tan, Zhi, Xing, Jie, Li, Xu, Chen, Hao, Wang, Fei, Cheng, Yuan, Tang, Manjing, Zhu, Jianguo
Format: Article
Language:English
Online Access:Get full text
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Summary:An easy approach is suggested to obtain excellent piezoelectric performances in potassium sodium niobate (KNN)-based ceramics simultaneously with low dielectric loss (tanδ), high Curie temperature (T C), and electromechanical coupling factor (k p). Herein, a KNN-based ceramics system with nonstoichiometric Nb5+ is designed. Excessive Nb5+ occupying the B-site significantly influences the microstructural features and electrical properties of KNN-based ceramics. Furthermore, the excessive Nb5+ improves the temperature stability of ceramics by providing the domain wall pegging effect and defect dipole. A high T C = 300 °C, large k p = 0.516, and d 33 = 450 pC/N can be simultaneously obtained in the KNN-based ceramics with nonstoichiometric Nb5+. These results confirm that the comprehensive electrical properties of KNN-based ceramics can be tuned by optimizing the content of nonstoichiometric Nb5+.
ISSN:0020-1669
1520-510X
DOI:10.1021/acs.inorgchem.2c03160