Good temperature stability of K0.5Na0.5NbO3 based lead-free ceramics and their applications in buzzers |
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Authors: | Lang Wu Dingquan Xiao Jiagang Wu Yong Sun Dunmin Lin Jianguo Zhu Ping Yu Yan Zhuang Qun Wei |
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Affiliation: | aSchool of Material Science and Engineering, Sichuan University, Chengdu 610064, China;bSchool of Material Science and Engineering, Southwest University of Science and Technology, Sichuan, Mianyang 621010, China;cGCI Science and Technology Co. Ltd., Guangzhou 510310, China |
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Abstract: | (K0.5−xLix)Na0.5(Nb1−ySby)O3 (KLNNSx–y, x = 0–4 mol% and y = 0–8 mol%) lead-free piezoelectric ceramics were prepared by the conventional mixed oxide method. The denser microstructure and better electrical properties of the ceramics were obtained as compared to the pure K0.5Na0.5NbO3 ceramic. The temperature stability of the electrical properties of the ceramics was also investigated. The experimental results show that the KLNNS2.5–5 ceramic exhibits good electrical properties (kp 49%, k31 30% and , tan δ 0.019), and possesses good temperature stability in the temperature range of −40 to 85 °C. The related mechanisms for improved electrical properties and temperature stability were also discussed. Moreover, buzzers based on the KLNNS2.5–5 ceramic have been fabricated and their characterization is presented. These results show that the KLNNS2.5–5 ceramic is a promising lead-free material for practical application in buzzers. |
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Keywords: | Lead-free ceramics Piezoelectric properties Niobates Temperature stability (K Na)NbO3 |
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