Compositional range and electrical properties of the morphotropic phase boundary in the Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3 system

被引：164

作者：

Otonicar, M. ^{[1
]}

Skapin, S. D. ^{[1
]}

Spreitzer, M. ^{[1
]}

Suvorov, D. ^{[1
]}

机构：

[1] Jozef Stefan Inst, Jamova 39, SI-1000 Ljubljana, Slovenia

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2010年 / 30卷 / 04期

关键词：

Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3; Sintering; Microstructure; Morphotropic phase boundary (MPB); Electrical properties; FREE PIEZOELECTRIC CERAMICS; LEAD; FERROELECTRICS; PEROVSKITES; TEMPERATURE; TRANSITIONS; BEHAVIOR;

D O I：

10.1016/j.jeurceramsoc.2009.10.006

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：

We have investigated the Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3 (NBT-KBT) system, with its complex perovskite structure, as a promising material for piezoelectric applications. The NBT-KBT samples were synthesized using a solid-state reaction method and characterized with XRD and SEM. Room-temperature XRD showed a gradual change in the crystal structure from tetragonal in the KBT to rhombohedral in the NBT, with the presence of an intermediate morphotropic region in the samples with a compositional fraction x between 0.17 and 0.25. The fitted perovskite lattice parameters confirmed an increase in the size of the crystal lattice from NBT towards KBT, which coincides with an increase in the ionic radii. Electrical measurements on the samples showed that the maximum values of the dielectric constant, the remanent polarization and the piezoelectric coefficient are reached at the morphotropic phase boundary (MPB) (epsilon = 1140 at 1 MHz; P-r = 40 mu C/cm(2); d(33) = 134 pC/N). (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：971 / 979

页数：9

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