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Title of Journal: J Cent South Univ

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Abbravation: Journal of Central South University

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Central South University

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DOI

10.1002/pi.4980180521

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2227-5223

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Microstructure characterization of NiFeSubscript

Authors: Kaihua Shi Kechao Zhou Lei Zhang Zhiyou Li
Publish Date: 2012/09/08
Volume: 19, Issue: 9, Pages: 2411-2415
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Abstract

The solid state interdiffusion between NiFe2O4 and NiO in nitrogen atmosphere was studied by means of diffusion couple technique NiFe2O4/NiO diffusion couple with plane interfaces was made by clamping method and sintering at 1 300 °C for 10 h Scanning electronic microscopy SEM and energydispersive Xray spectrometry EDS were used to analyze the microstructure and phase composition of the diffusion couples The results indicate that a porous layer of uniform thickness forms along the NiFe2O4/NiO bonding interface and exhibits a deep penetration in the NiFe2O4 due to the Kirkendall effect Furthermore SEM observations reveal that the needlelike nickel ferrite precipitates form in NiO near the interface and the formation mechanism of them are inferred to be diffusion type solidstate phase changes

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