Frequency and temperature dependent dielectric and conductivity behavior of 0.95(K0.5Na0.5)NbO3-0.05BaTiO3 ceramic

被引：89

作者：

Liu, Laijun ^{[1
]}

Wu, Meixia ^{[1
]}

Huang, Yanmin ^{[1
]}

Yang, Zhao ^{[1
]}

Fang, Liang ^{[1
]}

Hu, Changzheng ^{[1
]}

机构：

[1] Guilin Univ Technol, Key Lab New Proc Technol Nonferrous Met & Mat, State Key Lab Breeding Base Nonferrous Met & Spec, Minist Educ,Coll Mat Sci & Engn, Guilin 541004, Guangxi, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2011年 / 126卷 / 03期

关键词：

Sodium potassium niobate; Dielectric relaxation; Conductivity; PIEZOELECTRIC PROPERTIES; ELECTRICAL-PROPERTIES; MICROSTRUCTURE; MNO2;

D O I：

10.1016/j.matchemphys.2010.12.046

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dielectric and conductivity measurements were carried out on the 0.95(K0.5Na0.5)NbO3-0.05BaTiO(3) (KNN-5BT) ceramic both as a function of temperature (similar to 350-850 K) and frequency (40 Hz to 100 MHz). A high-temperature dielectric relaxation above Curie temperature (similar to 590 K) was observed and analyzed with the Cole-Cole function. Frequency dependent conductivity was analyzed with an augmented Jonscher relation and exhibited a universal conductivity behavior. The activation energy of dielectric relaxation was estimated to be 1.09 eV. It could be attributed to the thermal motion of double ionized oxygen vacancy or to the formation of defect dipoles between the acceptor ion and charge compensating oxygen vacancies. The mechanism for both the high-temperature dielectric relaxation and the frequency dependent conductivity was proposed based on a possible mode of incorporation of Ba2+ and Ti4+ ions into the KNN lattice sites. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：769 / 772

页数：4

共 30 条

[1] Structural variation and piezoelectric properties of 0.95(Na0.5K0.5)NbO3-0.05BaTiO3 ceramics [J].