Dielectric relaxation and ionic conductivity studies of [N(CH3)4]2Cu0.5Zn0.5Cl4

被引：66

作者：

Ben Rhaiem, A. ^{[1
]}

Hlel, F. ^{[1
]}

Guidara, K. ^{[1
]}

Gargouri, A. ^{[1
]}

机构：

[1] Fac Sci Sfax, Lab Etat Solide, Sfax 3038, Tunisia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2008年 / 463卷 / 1-2期

关键词：

dielectric measurements; AC conductivity; hopping frequency; equivalent circuit;

D O I：

10.1016/j.jallcom.2007.09.032

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The complex impedance of the compound [N(CH3)(4)](2)Cu0.5Zn0.5Cl4 have been investigated in the temperature range 443-532K and in the frequency range 200Hz-5MHz. Dielectric data were analyzed using complex permittivity epsilon* and complex electrical modulus M* for the sample at various temperatures. The modulus plot can be characterized by full width at half height or in terms of a non-experiential decay function phi(t) = exp(-t/tau)(beta). The frequency dependence of the conductivity is interpreted in term of Jonschers law: sigma(omega) = sigma(DC) +A omega(n). The conductivity follows the Arrhenius relation. Hopping frequency was determined and activation energy of hopping is almost equal to the activation energy of conduction. The Z' and Z '' versus frequency plots are well fitted to an equivalent circuit model. The circuits consist of the parallel combination of bulk resistance R-p and constant phase elements CPE. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：440 / 445

页数：6

共 35 条

[1] Analysis of the ferroelastic phase transition of N(CH3)(4)MnCl3 (TMMC) by means of x-ray diffraction study [J].