Abstract
The dependence of structure and piezoelectric response d33 on individual excess A-site K or Na in K0.5Na0.5NbO3 based lead-free piezoceramics is reported. The coexistence of orthorhombic, tetragonal, and monoclinic phases at room temperature is observed in the investigated 0.94K0.5+xNa0.5NbO3–0.06LiNbO3 and 0.94K0.5Na0.5+yNbO3–0.06LiNbO3 ceramics (x, y = 0–0.025). The weight ratio of three phases, orthorhombic-tetragonal phase transition temperature, and d33 value are highly sensitive to A-site K or Na nonstoichiometry. A-site Na nonstiochiometry plays a dominant role in enhancing the electrical properties of KNN by significantly reducing the weight ratio percentage of monoclinic phase and shifting the orthorhombic-tetragonal phase transition temperature to lower temperatures.
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Acknowledgments
This work was financially supported by the Program for the National Natural Science Foundation of China (Grant no. 51172053 and 51302150) and the Science Research Funding of Shenzhen Municipality (Grant no. JC201105160545A and JCYJ20140509142357196).
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Ma, Q., Wan, B., Cheng, L. et al. Structure and piezoelectric properties of K0.5Na0.5NbO3 based lead-free piezoceramics with slight deviation from A-site K or Na stoichiometry. J Electroceram 36, 30–39 (2016). https://doi.org/10.1007/s10832-016-0013-6
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DOI: https://doi.org/10.1007/s10832-016-0013-6