Phase structure and electrical properties of (0.8 − x) BaTiO3-0.2Bi0.5Na0.5TiO3-xBaZrO3 lead-free piezoceramics |
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Authors: | Fei ZhouLang Wu Naiming LiuYuancheng Teng Yuxiang LiJianwu Wen Xuetan Ren |
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Affiliation: | State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China |
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Abstract: | Lead-free piezoelectric ceramics (0.8 − x)BaTiO3-0.2Bi0.5Na0.5TiO3-xBaZrO3 (BT-BNT-xBZ, 0 ≤ x ≤ 0.08) doped with 0.3 wt% Li2CO3 were prepared by conventional solid-state reaction method. With the Li2CO3 doping, all the ceramics can be well sintered at 1170-1210 °C. The phase structure, dielectric, ferroelectric and piezoelectric properties of the ceramics were investigated. Results show that a morphotropic phase boundary (MPB) between tetragonal and pseudocubic phases exists at x = 0.03-0.04. The addition of Zr can improve the piezoelectric properties of BT-BNT ceramics. Furthermore, a relaxor behavior is induced and the tetragonal-cubic phase transition shifts towards lower temperatures after the addition of Zr. The ceramics with x = 0.03 possess the optimum electrical properties: d33 = 72 pC/N, kp = 15.4%, ?r = 661, Pr = 18.5 μC/cm2, Ec = 34.1 kV/cm, Tc = 150 °C. |
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Keywords: | Ceramics Ferroelectrics Dielectric properties Piezoelectricity |
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