AC ionic conductivity investigations on the CsK(SO4)•Te(OH)6 material

被引：12

作者：

Chabchoub, N ^{[1
]}

Khemakhem, H ^{[1
]}

机构：

[1] Fac Sci Sfax, Appl Phys Lab, Sfax 3018, Tunisia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2004年 / 370卷 / 1-2期

关键词：

dielectric relaxation; superionic conduction; modulus formalism;

D O I：

10.1016/j.jallcom.2003.08.091

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：

Single crystals of CsK(SO4)Te-.(OH)(6) are obtained by slow evaporation at room temperature. Differential scanning calorimetry (DSC) measurements have been carried out in the temperature range 350-650 K. It reveals three anomalies in the studied temperature range. Complex impedance measurements are performed on this material as a function of both temperature and frequency. The electric conduction and dielectric relaxation have been studied. The temperature dependence of DC conductivity indicates that the sample became an ionic conductor at high temperature. The frequency dependence of conductivity follows the Jonscher's dynamic law. The high level of conductivity at high temperature is explained by the dynamical disordering of protons between the neighboring SO4 groups. This behavior indicates the presence of superprotonic phase transition in CsK(SO4).Te(OH)(6). (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：8 / 17

页数：10

共 18 条

[1] TEMPERATURE-DEPENDENCE OF THE AC CONDUCTIVITY OF NA BETA-ALUMINA [J].