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Strong Piezoelectricity in (1 – x)(K0.4Na0.6)(Nb0.96Sb0.04)O3xBi0.5K0.5Zr1–ySnyO3 Lead-Free Binary System: Identification and Role of Multiphase Coexistence

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journal contribution
posted on 18.03.2015, 00:00 by Ting Zheng, Jiagang Wu, Dingquan Xiao, Jianguo Zhu, Xiangjian Wang, Lipeng Xin, Xiaojie Lou
Here we report a strong piezoelectric activity in (1 – x)­(K0.4Na0.6)­(Nb0.96Sb0.04)­O3-xBi0.5K0.5Zr1–ySnyO3 lead-free ceramics by designing different phase boundaries. The phase boundaries concerning rhombohedral-orthorhombic-tetragonal (R-O-T) and rhombohedral-tetragonal (R-T) multiphase coexistence were attained by changing BKZS and Sn contents and then were identified by the X-ray diffraction patterns as well as temperature-dependent permittivity and ν1 Raman modes associated with BO6 perovskite octahedron. A high strain (strain = 0.21–0.28% and d33* = 707–880 pm/V) and a strong piezoelectric coefficient (d33 = 415–460 pC/N) were shown in the ceramics located at the multiphase coexistence region. The reported results of this work are superior to that (d33* ∼ 570 pm/V and d33 ∼ 416 pC/N) of the textured (K,Na,Li)­(Nb,Ta,Sb)­O3 ceramics [Nature 2004, 432, 84]. We believe that the material system of this work will become one of the most promising candidates for piezoelectric actuators.