Microstructure and DC electrical conductivity of spinel nickel ferrite sintered in air and nitrogen atmospheres

被引:27
作者
Liu, Baogang [1 ]
Zhou, Kechao [1 ]
Li, Zhiyou [1 ]
Zhang, Dou [1 ]
Zhang, Lei [1 ]
机构
[1] Cent South Univ, Powder Met Res Inst, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China
关键词
Ceramics; Electrical properties; Microstructure; INERT ANODES;
D O I
10.1016/j.materresbull.2010.07.003
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In recent years, the development of inert anode materials has gained considerable attention because such materials are capable of producing only environment-friendly O-2 and saving energy during aluminum electrolysis. Nickel ferrite was prepared by a solid-state reaction as the inert anode in this study and its microstructures and direct current conductivities were analyzed in detail regarding the effects of different sintering atmospheres. A single-phase spinel structure was confirmed for all samples by X-ray powder diffraction. The grain sizes and the relative densities of the samples sintered in nitrogen increased by over 7 mu m and 10.8%, respectively, compared to those sintered in air. The direct current conductivities of the samples sintered in nitrogen showed a drastic increase compared to those sintered in air, believed to be due to the effects of increased Fe2+ ion concentration at octahedral sites and the increase of the relative density. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:1668 / 1671
页数:4
相关论文
共 20 条