Lead-free electrostrictive (Bi0.5Na0.5)TiO3-(Bi0.5K0.5)TiO3-(K0.5Na0.5)NbO3 ceramics with good thermostability and fatigue-free behavior

被引:47
作者
Hao, Jigong [1 ]
Xu, Zhijun [1 ]
Chu, Ruiqing [1 ]
Li, Wei [1 ]
Du, Juan [1 ]
机构
[1] Liaocheng Univ, Coll Mat Sci & Engn, Liaocheng 252059, Peoples R China
基金
国家高技术研究发展计划(863计划); 中国国家自然科学基金;
关键词
PEROVSKITE FERROELECTRICS; PHASE-TRANSITIONS; RELAXOR BEHAVIOR; SPECTROSCOPY; STRAINS;
D O I
10.1007/s10853-015-9080-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this study, we designed a series of compositions deep in pseudocubic region based on ternary (1-x)[(1-y)(Bi0.5Na0.5)TiO3-y(Bi0.5K0.5)TiO3]-x(K0.5Na0.5)NbO3 (BNKT100y-100xKNN) system for electrostrictive applications. Results show that the KNN substitution into BNKT100y induces a significant disruption of the ferroelectric order, and tends to enhance the electrostrictive properties of the ceramics. A high, purely electrostrictive effect with large electrostrictive coefficient Q (33) of 0.025 m(4)/C-2 and good thermostability comparable with that of traditional Pb-based electrostrictors is obtained for BNKT100y-xKNN (y = 0.20, x = 0.16) ceramics, which lies deep in pseudocubic region along the MPB compositions of the ternary system. Temperature-dependent structural analysis suggests that the good electrostrictive properties insensitive to temperature can be ascribed to the stable relaxor pseudocubic phase over a wide temperature range. Furthermore, it is found that the electrostrictive coefficient Q (33) exhibits only small degradation within 2 % at the field amplitude of 80 kV/cm up to 10(5) switching cycles. The large and purely electrostrictive effect with the exceptionally good fatigue resistance and thermostability makes this material a great potential to be applied to the environmental-friendly solid-state actuators.
引用
收藏
页码:5328 / 5336
页数:9
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