Electrical conductivity and dielectric analysis of La0.75(Ca,Sr)0.25Mn0.85Ga0.15O3 perovskite compound

被引：91
|
作者：
Omri, A. [1 ]
Bejar, M. [1 ]
Dhahri, E. [1 ]
Es-Souni, M. [2 ]
Valente, M. A. [3 ,4 ]
Graca, M. P. F. [3 ,4 ]
Costa, L. C. [3 ,4 ]
机构：
[1] Univ Sfax, Appl Phys Lab, Fac Sci Sfax, Sfax 3000, Tunisia
[2] Univ Appl Sci, Inst Mat & Surface Technol, Kiel, Germany
[3] Univ Aveiro, I3N, P-3810193 Aveiro, Portugal
[4] Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2012年 / 536卷
关键词：
Perovskite; Dielectric properties; ac Conductivity; Transport mechanism; IMPEDANCE; RELAXATION; TRANSITION; TRANSPORT;
D O I：
10.1016/j.jallcom.2012.04.094
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：
In the present study the tool of impedance spectroscopy was utilized to characterize dielectric behavior of AMn(0.85)Ga(0.15)O(3) (A = La0.75Ca0.08Sr0.17) composition synthesized by the solid-state reaction. The complex impedance has been investigated in the temperature range 100-360 K and in the frequency range 40 Hz-2 MHz. The Z' and Z '' versus frequency plots were found to exhibit a semi-circular arc described by an electrical equivalent circuit. The conductivity spectra have been investigated by the Jonscher universal power law: sigma(omega) = sigma(dc) + A omega(n), where omega is the frequency of the ac field, and n is the exponent. The activation energy obtained both from dc conductivity and modulus spectrum are very similar, and hence the relaxation process may be attributed to the same type of charge carriers. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：173 / 178
页数：6
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