Microstructural origin for the piezoelectricity evolution in (K0.5Na0.5)NbO3-based lead-free ceramics

被引：54

作者：

Guo, Hanzheng ^{[1
]}

Zhang, Shujun ^{[2
]}

Beckman, Scott P. ^{[1
]}

Tan, Xiaoli ^{[1
]}

机构：

[1] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

[2] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2013年 / 114卷 / 15期

基金：

美国国家科学基金会;

关键词：

TRANSMISSION ELECTRON-MICROSCOPY; BOUNDARY CRACKING; DOMAIN-STRUCTURE; PHASE; KNBO3;

D O I：

10.1063/1.4825213

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Chemically modified (K0.5Na0.5)NbO3 compositions with finely tuned polymorphic phase boundaries (PPBs) have shown excellent piezoelectric properties. The evolution of the domain morphology and crystal structure under applied electric fields of a model material, 0.948(K0.5Na0.5)NbO3-0.052LiSbO(3), was directly visualized using in situ transmission electron microscopy. The in situ observations correlate extremely well with measurements of the electromechanical response on bulk samples. It is found that the origin of the excellent piezoelectric performance in this lead-free composition is due to a tilted monoclinic phase that emerges from the PPB when poling fields greater than 14 kV/cm are applied. (C) 2013 AIP Publishing LLC.

引用

页数：8

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