Origin of the large strain response in tenary SrTi0.8Zr0.2O3 modified Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3 lead-free piezoceramics

被引:36
作者
Guo, Yuchen [1 ]
Fan, Huiqing [1 ]
Shi, Jing [1 ]
机构
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
关键词
PIEZOELECTRIC RESPONSE; ZIRCONATE-TITANATE; DOMAIN-WALL; CERAMICS;
D O I
10.1007/s10853-014-8599-z
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The perovskite oxides (1 - x)Bi-0.5(Na0.9K0.1)(0.5)TiO3-xSrTi(0.8)Zr(0.2)O(3) (SZT1000x, x = 0, 0.2, 0.4, 0.6, 0.8, and 1 %) were prepared via the conventional solid-state reaction method. The room temperature ferroelectric P-E loops coordinate with polarization current density J-E curves illustrated the changes of ferroelectric domains and polar nanoregions under different driving fields exhaustively. The composition and electric field dependent strain behavior of this system were investigated to develop a lead-free piezoelectric material with a large strain response at a lower electric field. A large strain of 0.44 % (S-max/E-max = 744 pm/V) at an applied field of 50 kV/cm was obtained at the composition of 0.6 mol% SZT. Temperature-dependent hysteresis measurements reveal the primary origin of the large strain is due to the presence of a nonpolar phase at a zero field. Upon the application of an electric field, the nonpolar phase that can easily transform into a long-range ferroelectric phase, and then brings the system back to its unpoled state once the applied electric field is removed. Notably, the electric field required to deliver large strains is reduced to 40 kV/cm while the S-max/E-max reached up to 717 pm/V, indicating that the developed material is highly promising for actuator applications.
引用
收藏
页码:403 / 411
页数:9
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