Effect of Ferroelectric Long-Range Order on the Unipolar and Bipolar Electric Fatigue in Bi1/2Na1/2TiO3-Based Lead-Free Piezoceramics

被引：84

作者：

Luo, Zhenhua ^{[1
]}

Granzow, Torsten ^{[2
]}

Glaum, Julia ^{[1
,2
]}

Jo, Wook ^{[2
]}

Roedel, Juergen ^{[2
]}

Hoffman, Mark ^{[1
]}

机构：

[1] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

[2] Tech Univ Darmstadt, Inst Mat Sci, D-64287 Darmstadt, Germany

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2011年 / 94卷 / 11期

基金：

澳大利亚研究理事会;

关键词：

ZIRCONATE-TITANATE CERAMICS; PIEZOELECTRIC CERAMICS; DIELECTRIC-PROPERTIES; FIELD; NA0.5BI0.5TIO3; TEMPERATURE; BEHAVIOR; SYSTEM; STRAIN;

D O I：

10.1111/j.1551-2916.2011.04605.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The fatigue behavior of the lead-free piezoelectric Bi1/2Na1/2 TiO3-BaTiO3-K0.5Na0.5NbO3 (BNT-BT-KNN) under bipolar and unipolar electrical loading is investigated. Special attention is paid to the effect of a decreasing ferroelectric order which was affected by an increase in KNN-content. It is found that, in mainly ferroelectric systems with low KNN-content, bipolar cycling leads to domain wall pinning and formation of micro-cracks, while in mainly non-ferroelectric systems with high KNN-content fatigue can be rationalized by the repeated field-induced phase transition occurring during each field cycle. Under unipolar load, fatigue in low-KNN systems is dominated by domain wall pinning and the formation of a space charge field. Only the latter effect is present in non-ferroelectric high-KNN systems, which fatigue to a smaller degree.

引用

页码：3927 / 3933

页数：7

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