Chemical composition and tolerance factor at the morphotropic phase boundary in (Bi0.5Na0.5)TiO3-based piezoelectric ceramics

被引：102

作者：

Lee, Wei-Chih ^{[1
]}

Huang, Chi-Yuen ^{[1
]}

Tsao, Liang-Kuo ^{[1
]}

Wu, Yu-Chun ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Resources Engn, Tainan 70101, Taiwan

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2009年 / 29卷 / 08期

关键词：

Perovskites; Piezoelectric properties; X-ray method; Tolerance factors; (Bi; Na)TiO3; SYSTEM;

D O I：

10.1016/j.jeurceramsoc.2008.08.028

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：

A quantitative relation between the morphotropic phase boundary (MPB) composition and the tolerance factor (t) in (Bi0.5Na0.5)TiO3 (BNT)-based piezoelectric ceramics was established. The t value of the MPB compositions in BNT-based ceramics is around 0.990-0.993 and is independent of the types of added compounds. In order to experimentally demonstrate it, two piezoelectric ceramic systems (1 - x)(Bi0.5Na0.5)TiO3-x(Ba1-aSra)TiO3, a= 0.05 and 0.3 (BNBST5-x and BNBST30-x, x < 12%), were used. X-ray diffraction patterns and the lattice parameter investigations revealed that these two systems formed solid solutions within the studied stoichiometry and showed a rhombohedral-tetragonal phase transformation. Furthermore, both the structure analysis and electric properties measurements indicated that the MPB compositions were BNBST5-6 and BNBST30-8 and their corresponding t value were 0.9900 and 0.9903, respectively. The results confirm the relation between the MPB composition and t value and provide a method for designing new piezoelectric materials. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1443 / 1448

页数：6

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