Enhanced energy storage performance and fatigue resistance of Mn-doped 0.7Na0.5Bi0.5TiO3-0.3Sr0.7Bi0.2TiO3 lead-free ferroelectric ceramics

被引:7
|
作者
Wang, Jinbo [1 ]
Fan, Huiqing [1 ]
机构
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
关键词
perovskites; energy storage; ceramic; ferroelectric;
D O I
10.1557/s43578-020-00082-5
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The validity of Mn element on enhanced energy storage performance and fatigue resistance of Mn-doped 0.7Na(0.5)Bi(0.5)TiO(3)-0.3Sr(0.7)Bi(0.2)TiO(3) lead-free ferroelectric ceramics (BNT-BST-xMn) is certified by doping. The effects of Mn modification on the dielectric behavior, ferroelectric, energy storage properties, and AC impedance are comprehensively investigated. It is found that the average grain size of the ceramics modified by Mn additions is reduced slightly. Moreover, the relaxor properties are evidently enhanced with the increased Mn content. The AC impedance spectra can even better clarify the dielectric response and relaxor behavior. The results suggest that both of the dielectric response and relaxor behavior are determined by defects especially concentration of the oxygen vacancy. The superior energy storage properties are realized at x = 0.05 with an energy storage density (W-rec) of 1.33 J/cm(3) as well as energy storage efficiency (eta) of 86.2% at 100 kV/cm, accompanied with a superior thermal stability. BNT-BST-5Mn ceramics can maintain a stable energy storage performance within 10(6) fatigue cycles, indicating an excellent fatigue resistance.
引用
收藏
页码:1161 / 1170
页数:10
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