Abstract
Lead-free K0.5Na0.5NbO3 (KNN)-based single crystals have been prepared by a seed-free, solid-state crystal growth method. The effects of the calcined temperature of ingredients on the growth, structure and electrical properties of the single crystals are systematically studied. Results show that increasing the calcined temperature is beneficial to the synthesis of pure orthorhombic-phase powder, but it hardly affects the phase structure of the single crystals. When the calcined temperature is in the range of 700–850 °C, it is more useful for obtaining larger KNN-based crystals. What is more, the width of the domains in the crystals first decreases and then increases with rising of the calcined temperature, which is in well agreement with the changing regularity of the structure and electrical properties. The single crystals with good electrical properties can be obtained in a wide calcined-temperature range of 700–850 °C: the piezoelectric constant d33 of 155–209 pC N−1, dielectric constant ε of 291–389, dielectric loss tanδ of 2.0–3.4%, and remnant polarization Pr of 25.4–49.1 μC cm−2.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (51562004, 61571142), Guangxi Natural Science Outstanding Youth Foundation (2016GXNSFFA380007), Guangxi Key Laboratory of Information Materials (Guilin University of Electronic Technology, Project No. 171004-Z) and Program for Bagui Scholars of Guangxi.
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Yao, X., Jiang, M., Li, W. et al. Effects of the calcined temperature of ingredients on the growth, structure and electrical properties of (K0.5Na0.5)NbO3-based single crystals. J Mater Sci: Mater Electron 31, 21971–21980 (2020). https://doi.org/10.1007/s10854-020-04700-0
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DOI: https://doi.org/10.1007/s10854-020-04700-0