Low sintering temperature and high piezoelectric properties of Li-doped (Ba,Ca)(Ti,Zr)O3 lead-free ceramics
Low sintering temperature and high piezoelectric properties of Li-doped (Ba,Ca)(Ti,Zr)O3 lead-free ceramics
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DOI：
10.1016/j.jallcom.2015.01.088
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发表时间：
2015-05-25
影响因子：
6.2
通讯作者：
Li, Guorong
中科院分区：
文献类型：
--
作者：
Chen, Xiaoming;Ruan, Xuezheng;Li, Guorong
采用两步合成和固相反应法制备了掺li的Ba0.85Ca0.15Ti0.9Zr0.1O3 （BCZT）无铅压电陶瓷。li掺杂的助烧剂使陶瓷的密度和晶粒尺寸充分增加，烧结温度从1540℃左右下降到1400℃左右，x射线衍射显示li掺杂BCTZ陶瓷的相结构随烧结温度的变化而变化，这与温度相关介电曲线观察到的相变相一致。良好极化掺锂BCZT陶瓷具有较高的压电常数d(33) （512 pC/N）和平面机电耦合因子k(p)(0.49)，具有软质Pb(Zr,Ti)O-3 （PZT）压电陶瓷的特性，而机械品质因子Q(m)约为190，具有硬质PZT压电陶瓷的特性。li掺杂BCZT的性能增强是由li掺杂效应和烧结效应共同作用于微观结构和室温前后的相变来解释的。(C) 2015 Elsevier B.V.版权所有
Li-doped Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCZT) lead-free piezoelectric ceramics were prepared by the two-step synthesis and the solid-state reaction method. The density and grain size of ceramics sufficiently increases by Li-doped sintering aid, and their sintering temperature decreases from about 1540 degrees C down to about 1400 degrees C. X-ray diffraction reveals that the phase structure of Li-doped BCTZ ceramics is changed with the sintering temperature, which is consistent with their phase transition observed by the temperature-dependent dielectric curves. The well-poled Li-doped BCZT ceramics show a high piezoelectric constant d(33) (512 pC/N) and a planar electromechanical coupling factor k(p) (0.49), which have the characteristics of soft Pb(Zr,Ti)O-3 (PZT) piezoceramic, on the other hand, the mechanical quality factor Q(m) is about 190, which possesses the features of hard PZT piezoceramics. The enhanced properties of the Li-doped BCZT are explained by the combination of Li-doped effect and sintering effect on the microstructure and the phase transition around room temperature. (C) 2015 Elsevier B.V. All rights reserved.