Dielectric relaxation behavior and mechanism of Y2/3Cu3Ti4O12 ceramic

被引：91

作者：

Deng, Jianming ^{[1
]}

Liu, Laijun ^{[1
]}

Sun, Xiaojun ^{[1
]}

Liu, Saisai ^{[1
]}

Yan, Tianxiang ^{[1
]}

Fang, Liang ^{[1
]}

Elouadi, Brahim ^{[2
]}

机构：

[1] Guilin Univ Technol, Guangxi Univ Key Lab Nonferrous Met Oxide Elect F, Key Lab Nonferrous Mat & New Proc Technol, Minist Educ,Coll Mat Sci & Engn, Guilin 541004, Peoples R China

[2] Univ La Rochelle, Lab Chem Anal Elaborat & Mat, Engn LEACIM, Ave Michel Crepeau, F-17042 La Rochelle 01, France

来源：

MATERIALS RESEARCH BULLETIN | 2017年 / 88卷

关键词：

Y2/3Cu3Ti4O12; Ceramics; Scaling behavior; Polaron hopping; Dielectric relaxation; ELECTRICAL-PROPERTIES; CONDUCTIVITY SPECTRA; CACU3TI4O12; CERAMICS; SCALING PROPERTIES; SPECTROSCOPY; TEMPERATURE; CONSTANT; BI2/3CU3TI4O12; PERMITTIVITY; HEXAFERRITE;

D O I：

10.1016/j.materresbull.2017.01.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Y2/3Cu3Ti4O12 (YCTO) ceramics were sintered in air (YCTO-air) and pure O-2 atmosphere (YCTO-O-2), respectively. It was found that the permittivity and dielectric loss of YCTO-O-2 were decreased drastically in low frequency. The frequency dependent impedance (Z '') and modulus (M '') spectra of YCTO-air and YCTO-O-2 show a thermal activated process. The scaling behavior of both Z '' and M '' spectra further suggest that the distribution of relaxation times is temperature independent. The Cole-Cole plot in impedance formalism shows that electrical response of the samples originates from both grains and grain-boundaries. Conductivity (sigma') spectra follow Universal Dielectric Repose law. The short-range translation hopping assisted by small polaron hopping mechanisms for YCTO-O-2. Moreover, the scaling behavior of sigma' spectra further confirms that the distribution of local electrical response time is temperature independent. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：320 / 329

页数：10

共 54 条

[1] Dielectric relaxation in BaTi0.85(Fe1/2Nb1/2)0.15O3 perovskite ceramic [J].