Large Piezoelectric Effect in Pb-Free Ceramics
Large Piezoelectric Effect in Pb-Free Ceramics
复制标题
无铅陶瓷中的大压电效应
DOI：
10.1103/physrevlett.103.257602
复制
发表时间：
2009-12-18
影响因子：
8.6
通讯作者：
Ren, Xiaobing
中科院分区：
文献类型：
--
作者：
Liu, Wenfeng;Ren, Xiaobing
本文报道了一种无铅压电陶瓷Ba（Ti_（0.8）Zr_（0.2））O_（3-）（Ba_（0.7）Ca_（0.3））TiO_3，在最佳组成下，其压电系数d（33）达到620 pC/N。其相图显示了从立方顺电相（C）、铁电菱面体相（R）和四面体相（T）的三临界三相点开始的准同型相界（MPB）。MPB组合物的高压电性源于MPB与三临界三相点的组合物接近，这导致几乎消失的极化各向异性，从而促进> T和> R状态之间的极化旋转。我们预测，本系统的MPB组成的单晶形式可能达到巨大的d（33）=1500-2000 pC/N。我们的工作可能会提供一个新的配方设计高压电材料（包括无铅和含铅）从TCP开始搜索MPBs。
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 > T and > 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.