Article ID Journal Published Year Pages File Type
1490875 Materials Research Bulletin 2010 4 Pages PDF
Abstract

In recent years, the development of inert anode materials has gained considerable attention because such materials are capable of producing only environment-friendly O2 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 μm 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.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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