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1Microstructure characterization of NiFe_2O_4-NiO solid-solid diffusion couple显示文摘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.时凯华 周科朝 张雷 李志友 2012Journal of Central South University2012,19,9:0
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