Electromechanical properties and morphotropic phase boundary of Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3-BaTiO3 lead-free piezoelectric ceramics

被引：47

作者：

Chen, W ^{[1
]}

Li, YM

Xu, Q

Zhou, J

机构：

[1] Wuhan Univ Technol, Inst Mat Sci & Engn, Wuhan 430070, Peoples R China

[2] Jingdezhen Ceram Inst, Jingdezhen 333001, Peoples R China

来源：

JOURNAL OF ELECTROCERAMICS | 2005年 / 15卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Na0.5Bi0.5TiO3; piezoelectric properties; morphtropic phase boundary; perovskite;

D O I：

10.1007/s10832-005-3301-0

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 crystal structure and electromechanical properties of two ternary ceramic Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3-BaTiO3 (NBT-KBT-BT) systems were investigated. A gradual change in crystalline structure and microstructure with the increase of KBT and BT concentrations were observed. It was ascertained that the rhombohedral-tetragonal morphtropic phase boundary (MPB) lies in the range of 0.024 <= x <= 0.030 for (1-5x) NBT-4xKBT-xBT system and 0.025 <= y <= 0.035 for (1 - 3y) NBT-2y KBT-y BT system at room temperature. The piezoelectric constant d(33) and electromechanical coupling factor k(p) of the ceramics attain a maximum value of 150 pC/N and 0.298, respectively. The MPB phase diagram of NBT-KBT-BT ternary system was determined by phase analysis of XRD patterns from calcined specimens. The ferroelectric properties of the (1 - 5x) NBT-4x KBT-x BT system have been characterized. The ternary system ceramics have relatively high Curie temperature T-c.

引用

页码：229 / 235

页数：7

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