Structural dielectric and electrical studies in tungsten doped SrBi2Ta2O9 ferroelectric ceramics

被引:37
作者
Coondoo, Indrani
Jha, A. K.
Agarwal, S. K.
机构
[1] Delhi Coll Engn, Dept Appl Phys, Delhi 110042, India
[2] Natl Phys Lab, New Delhi 110012, India
关键词
dielectric properties; impedance; ferroelectric ceramics; solid state reaction; X-ray diffraction;
D O I
10.1016/j.ceramint.2005.07.013
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
The effect of tungsten doping on the structural, dielectric and impedance properties of SrBi2Ta2O9 (SBT) ferroelectric ceramics is reported. Tungsten doped SrBi2(WxTa1-x)(2)O-9 (0.0 <= x <= 0.20) ceramics were synthesized by the solid state reaction method. X-ray diffractograms of the samples reveal the single phase layered perovskite structure formation with tungsten content x <= 0.05. Variation in the lattice parameters has been explained in terms of the limited structural constraint and relaxation imposed by the Bi-O interlayer. Dielectric constant (epsilon) and dielectric loss (tan delta) measurements as a function of temperature reveal a decrease in the Curie temperature (T-c) from 320 degrees C (for x = 0.0) to 291 degrees C (for x = 0.025) and an increasing trend over the doping range of 0.05 <= x <= 0.20. Significant reduction in the dielectric loss with tungsten addition have been observed. The observed changes in epsilon and tan delta with frequency and temperature have been considered in the light of oxygen and cationic vacancies in tungsten doped samples. Dielectric constant of the samples increases with tungsten doping at their respective Curie temperatures. These have been viewed in terms of relative dominance of the ionic and electronic polarizations. Bulk conductivity of the samples as deduced through ac impedance investigations indicate an increased electronic conduction beyond the observed solubility limit of 0.05 of tungsten doping. (c) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码:41 / 47
页数:7
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