Relaxation and Dielectric Characteristics of Zn Substituted Copper-gallate Ferrite

作     者：N. N. Nikitenkov A. M. Hashhash I. P. Chernov Yu. I. Tyurin 

作者机构：Tomsk polytechnic university 

出 版 物：《沈阳理工大学学报》 (Journal of Shenyang Ligong University)

年 卷 期：2010年第29卷第2期

页      面：86-91页

学科分类：07[理学] 0703[理学-化学] 070301[理学-无机化学] 

主　　题：电介质介电常数 温度 锌 频率 

摘      要：The dielectric permittivities(ε′ & ε″) and dielectric loss tangent(tan) are studied for the prepared samples CuFe2O4 and Cu1-xZnxGa0.1Fe1.9O4 spinel ferrites with(0.0 ≤ x ≤ 0.5) from room temperature up to 700K in the frequency range(102~105Hz).Dielectric anomaly at the transition temperature Tc is pronounced in the relations of dielectric permittivitties with temperature where,the obtained Tc is found to decrease linearly with increasing Zn concentration.The relation of tan with frequency at different temperatures shows relaxation spectra where the relaxation time and the maximum frequency of the hopping conduction mechanism are determined.The variation of(ε′,ε″ and tanδ) with frequency and temperature displays a strong dependence on both gallium and zinc concentrations.The results are explained in light of the cation-anion-cation and cation-cation interactions over the octahedral sites in the spinel structure.