A New Method to Improve the Electrical Properties of KNN-based Ceramics: Tailoring Phase Fraction
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ArticleKAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Date
2017-08-18Online Publication Date
2017-08-18Print Publication Date
2018-01Permanent link to this record
http://hdl.handle.net/10754/625357
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Although both the phase type and fraction of multi-phase coexistence can affect the electrical properties of (K,Na)NbO3 (KNN)-based ceramics, effects of phase fraction on their electrical properties were few concerned. In this work, through changing the calcination temperature of CaZrO3 powders, we successfully developed the 0.96K0.5Na0.5Nb0.96Sb0.04O3-0.01CaZrO3-0.03Bi0.5Na0.5HfO3 ceramics containing a wide rhombohedral-tetragonal (R-T) phase coexistence with the variations of T (or R) phase fractions. It was found that higher T phase fraction can warrant a larger piezoelectric constant (d33) and d33 also showed a linear variation with respect to tetragonality ratio (c/a). More importantly, a number of domain patterns were observed due to high T phase fraction and large c/a ratio, greatly benefiting the piezoelectricity. In addition, the improved ferroelectric fatigue behavior and thermal stability were also shown in the ceramics containing high T phase fraction. Therefore, this work can bring a new viewpoint into the physical mechanism of KNN-based ceramics behind R-T phase coexistence.Citation
Lv X, Wu J, Zhu J, Xiao D, Zhangb X (2017) A New Method to Improve the Electrical Properties of KNN-based Ceramics: Tailoring Phase Fraction. Journal of the European Ceramic Society. Available: http://dx.doi.org/10.1016/j.jeurceramsoc.2017.08.016.Sponsors
Authors gratefully acknowledge the supports of the National Science Foundation of China (NSFC Nos., 51332003 and 51272164) and King Abdullah University of Science and Technology. We thank Mrs. Wang Hui for measuring FE-SEM images.Publisher
Elsevier BVAdditional Links
http://www.sciencedirect.com/science/article/pii/S0955221917305551ae974a485f413a2113503eed53cd6c53
10.1016/j.jeurceramsoc.2017.08.016