Morphotropic phase boundary and electrical properties of lead-free (K0.5Bi0.5)TiO3–Bi(Ni0.5Ti0.5)O3 relaxor ferroelectric ceramics
Morphotropic phase boundary and electrical properties of lead-free (K0.5Bi0.5)TiO3–Bi(Ni0.5Ti0.5)O3 relaxor ferroelectric ceramics
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DOI：
10.1016/j.ceramint.2013.05.009
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发表时间：
2013-12
影响因子：
5.2
通讯作者：
Wanli Zhao;R. Zuo
中科院分区：
文献类型：
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作者：
Wanli Zhao;R. Zuo
采用传统的固相法制备了无铅弛豫铁电陶瓷（1−x）（K 0. 5 Bi 0. 5）TiO 3-xBi（Ni 0. 5 Ti 0. 5）O3，研究了其相变行为和电学性能。在0.05<x<0.07的范围内发现了一个典型的菱方铁电相和四方铁电相之间的准同型相界（MPB），在此范围内，获得了最佳的压电和机电性能：d33 =126 pC/N，kP =18%。最重要的是，在MPB组合物中获得了~320 °C的高居里温度，在该温度附近，材料显示出典型的弛豫铁电行为，其特征在于存在扩散相变和频率色散，显著高于一些现有的MPB无铅钛酸盐系统的居里温度。这些结果表明，一个巨大的潜力的研究系统的设备应用程序。
Lead-free relaxor ferroelectric ceramics (1−x)(K0.5Bi0.5)TiO3–xBi(Ni0.5Ti0.5)O3were prepared by a conventional solid-state route, the phase transition behavior and corresponding electrical properties were investigated. A typical morphotropic phase boundary (MPB) between rhombohedral and tetragonal ferroelectric phases was identified to be in the range of 0.05<x<0.07 where the optimum piezoelectric and electromechanical properties ofd33=126 pC/N andkP=18% were achieved. Most importantly, a high Curie temperature ~320 °C, around which the material shows a typical relaxor ferroelectric behavior characterized by the presence of diffuse phase transition and frequency dispersion, was obtained in MPB compositions, significantly higher than those of some existing MPB lead-free titanate systems. These results demonstrate a tremendous potential of the studied system for device applications.