A New Method to Improve the Electrical Properties of KNN-based Ceramics: Tailoring Phase Fraction
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractAlthough 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.
CitationLv 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.
SponsorsAuthors 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.