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

来源：

MATERIALS RESEARCH BULLETIN | 2010年 / 45卷 / 11期

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

页码：1668 / 1671

页数：4

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