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 energy-dispersive X-ray 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 needle-like nickel ferrite precipitates form in NiO near the interface and the formation mechanism of them are inferred to be diffusion type solid-state phase changes.
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Foundation item: Project(50721003) supported by the National Natural Science Fund for Innovation Group of China; Project(2008AA030501) supported by the National High Technology Research and Development Program of China
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Shi, Kh., Zhou, Kc., Zhang, L. et al. Microstructure characterization of NiFe2O4-NiO solid-solid diffusion couple. J. Cent. South Univ. 19, 2411–2415 (2012). https://doi.org/10.1007/s11771-012-1289-6
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DOI: https://doi.org/10.1007/s11771-012-1289-6