Superlattice in single crystal barium-doped sodium bismuth titanate

被引：48

作者：

Soukhojak, AN ^{[1
]}

Wang, H ^{[1
]}

Farrey, GW ^{[1
]}

Chiang, YM ^{[1
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2000年 / 61卷 / 02期

基金：

美国国家科学基金会;

关键词：

piezoelectricity; superlattices; complex perovskites;

D O I：

10.1016/S0022-3697(99)00297-8

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Na1/2Bi1/2TiO3 (NBT) doped with BaTiO3 (BT) has recently shown promising piezoelectric properties in single crystal form. The piezoelectric properties appear to be highly dependent on BT concentration, with compositions close to the morphotropic phase boundary (similar to 6% BT) having the highest piezoelectric coefficients. Previous studies have resulted in conflicting conclusions regarding the presence and nature of the superlattice in NET. Using HREM and hot-stage TEM electron diffraction, we show that flux-grown single crystals of compositions (1 - x)NBT-xBT with x < 0.08 exhibit superlattice reflections that are present from room temperature up to 500 degrees C, above which temperature they reversibly vanish. The reflections are consistent with a superstructure due to single-axis in-phase octahedral tilt (a(0)a(0)c(+)). The dependence of the superlattice reflection intensity on temperature and BT content as well as possible mechanisms of superlattice formation are discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：301 / 304

页数：4

共 8 条

[1] Lead-free high-strain single-crystal piezoelectrics in the alkaline-bismuth-titanate perovskite family [J].