Microstructure characterization of NiFe₂O₄-NiO solid-solid diffusion couple

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.

Keywords

NiFe₂O₄ / microstructure / diffusion / Kirkendall effect

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