Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 25    No. 11    November 2015

[PDF Download]        

    

Effect of Cu ion substitution on structural anddielectric properties of Ni-Zn ferrites
Guang-sheng LUO1,2,3, Wei-ping ZHOU1,2,4, Jian-de LI3, Gui-wen JIANG3, Shao-long TANG1,2, You-wei DU1,2

1. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;
2. Department of Physics, Nanjing University, Nanjing 210093, China;
3. Academy of Space Technology, Nanchang University, Nanchang 330031, China;
4. Department of Applied Physics, School of Science,
Nanjing University of Science and Technology, Nanjing 210094, China

Abstract:A series of Cu-substituted Ni0.5-xCuxZn0.5Fe2O4 (x=0.12, 0.16, 0.20, 0.24 and 0.28) spinel ferrites were prepared by conventional ceramic method to investigate the effects of Cu compositional variation on the structure and dielectric properties. XRD patterns demonstrate that all the samples are crystallized in single-phase cubic spinel structure and the lattice constant increases with increasing Cu content. White grains observed by SEM are Cu-rich phase. The dielectric constant versus frequency curve displays a normal dielectric behavior of spinel ferrites. While the frequency dependence of dielectric loss tangent is found to be abnormal, exhibiting a peak at certain frequency for all Cu-substituted Ni-Zn ferrites. A maximum of the resistivity is observed at x=0.2 due to the decrease of hopping electrons between Fe2+ and Fe3+ in per unit volume, which is in contrast with the Cu content dependence of dielectric constant and dielectric loss.

 

Key words: ferrite; Cu ion substitution; dielectric constant; dielectric dispersion; dielectric loss; resistivity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com