Large Piezoelectric Effect in Pb-Free Ceramics

被引：2420

作者：

Liu, Wenfeng ^{[1
,2
,3
]}

Ren, Xiaobing ^{[3
]}

机构：

[1] Xi An Jiao Tong Univ, Multidisciplinary Mat Res Ctr, Xian 710049, Peoples R China

[2] Xi An Jiao Tong Univ, State Key Lab Elect Insulat & Power Equipment, Xian 710049, Peoples R China

[3] Natl Inst Mat Sci, Ferro Phys Grp, Tsukuba, Ibaraki 3050047, Japan

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 25期

基金：

中国国家自然科学基金;

关键词：

ELECTROMECHANICAL RESPONSE; POLARIZATION ROTATION; SINGLE-CRYSTALS; PHASE; STRAIN;

D O I：

10.1103/PhysRevLett.103.257602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a non-Pb piezoelectric ceramic system Ba(Ti0.8Zr0.2)O-3-(Ba0.7Ca0.3)TiO3 which shows a surprisingly high piezoelectric coefficient of d(33)similar to 620 pC/N at optimal composition. Its phase diagram shows a morphortropic phase boundary (MPB) starting from a tricritical triple point of a cubic paraelectric phase (C), ferroelectric rhombohedral (R), and tetragonal (T) phases. The high piezoelectricity of the MPB compositions stems from the composition proximity of the MPB to the tricritical triple point, which leads to a nearly vanishing polarization anisotropy and thus facilitates polarization rotation between << 001 >> T and << 111 >> R states. We predict that the single-crystal form of the MPB composition of the present system may reach a giant d(33)=1500-2000 pC/N. Our work may provide a new recipe for designing highly piezoelectric materials (both Pb-free and Pb-containing) by searching MPBs starting from a TCP.

引用

页数：4

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