Switching of morphotropic phase boundary and large strain response in lead-free ternary (Bi0.5Na0.5)TiO3-(K0.5Bi0.5)TiO3-(K0.5Na0.5)NbO3 system

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	Switching of morphotropic phase boundary and large strain response in lead-free ternary (Bi0.5Na0.5)TiO3-(K0.5Bi0.5)TiO3-(K0.5Na0.5)NbO3 system
	Hao, Jigong ; Shen, Bo ; Zhai, Jiwei ; Liu, Chunze ; Li, Xiaolong ; Gao, Xingyu
刊名	JOURNAL OF APPLIED PHYSICS
	2013
卷号	113 期号:11
ISSN号	0021-8979
英文摘要	In this work, we report the phase diagram of lead-free ternary (1 - y)[(1 - x)(Bi0.5Na0.5) TiO3-x (Bi0.5K0.5)TiO3]-y(K0.5Na0.5)NbO3 (BNT-BKT-KNN) system and study the switching characteristics of the morphotropic phase boundary (MPB). The addition of KNN intrinsically changes the structural nature of the system with the shift of MPB from MPB(I) between ferroelectric rhombohedral and ferroelectric tetragonal phases to MPB(II) between ferroelectric rhombohedral and relaxor pseudocubic phases. As the MPB(I) switches to MPB(II), large piezoelectric response with d(33) similar to 150pC/N that obtained for BNT-0.20BKT near MPB(I) almost disappears. Instead, a significant jump of electric-filed-induced strain S up to 0.32%-0.46% (S-max/E-max = 400-575 pm/V) is achieved near MPB(II) due to the shift of the ferroelectric-relaxor transition temperature TF-R down to room temperature. In this study, giant strain similar to 0.46% occurs in a very narrow region in the BNT-BKT-KNN system with x = 0.20, y = 0.01, which lies on an underlying tricritical triple point of a rhombohedral (R), tetragonal (T), and pseudocubic (Pc) phases. In-situ high-energy X-ray scattering experiments with external electric field reveal an initial electric-field-induced distortion from the Pc structure for the MPB(II) compositions, while those with single R phase shows no such distortion, which suggests that the large strain achieved near the MPB(II) is likely to be induced by the electric-field-induced structure distortion due to its relative instability structure. We believe that the discovery of a compositional line in the pseudo-ternary system, where the strain response is consistently derivable, should be useful for designing high-performance piezoelectric materials in other BNT-based systems by searching MPBs. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4795511]
收录类别	SCI
语种	英语
WOS记录号	WOS:000316545200048
公开日期	2014-06-13
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/13938]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	Hao, Jigong,Shen, Bo,Zhai, Jiwei,et al. Switching of morphotropic phase boundary and large strain response in lead-free ternary (Bi0.5Na0.5)TiO3-(K0.5Bi0.5)TiO3-(K0.5Na0.5)NbO3 system[J]. JOURNAL OF APPLIED PHYSICS,2013,113(11).
APA	Hao, Jigong,Shen, Bo,Zhai, Jiwei,Liu, Chunze,Li, Xiaolong,&Gao, Xingyu.(2013).Switching of morphotropic phase boundary and large strain response in lead-free ternary (Bi0.5Na0.5)TiO3-(K0.5Bi0.5)TiO3-(K0.5Na0.5)NbO3 system.JOURNAL OF APPLIED PHYSICS,113(11).
MLA	Hao, Jigong,et al."Switching of morphotropic phase boundary and large strain response in lead-free ternary (Bi0.5Na0.5)TiO3-(K0.5Bi0.5)TiO3-(K0.5Na0.5)NbO3 system".JOURNAL OF APPLIED PHYSICS 113.11(2013).