Study on grain growth and conduction mechanism of spinel nickel ferrite ceramics
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The important base of its application performance can be constituted by combining microstructure with electrical conductivityof spinel nickel ferrite ceramics. In this study, nickel ferrite ceramic powders were prepared by a high temperature solid-phasereaction and ceramic blocks were prepared by molding and sintering technology. X-ray diffraction, scanning electronmicroscopy, conductivity measurement and X-ray photoelectron spectrometry were employed for analyzing the phasecomposition, microstructure, electrical conductivity, and valence states of Fe ions. The grain growth mode and conductionmechanism of nickel ferrite ceramics were also discussed. Hexagonal growth spirals and growth hillocks were observed on eachcrystal plane of nickel ferrite single crystals. The growth of nickel ferrite crystals takes place by a spiral dislocation growthmechanism, indicating that the more Fe2+ ion formed in the sites of octahedral B of NiFe2O4 ceramics, the better the electricalconductivity of this ceramic materials.
Abstract
The important base of its application performance can be constituted by combining microstructure with electrical conductivityof spinel nickel ferrite ceramics. In this study, nickel ferrite ceramic powders were prepared by a high temperature solid-phasereaction and ceramic blocks were prepared by molding and sintering technology. X-ray diffraction, scanning electronmicroscopy, conductivity measurement and X-ray photoelectron spectrometry were employed for analyzing the phasecomposition, microstructure, electrical conductivity, and valence states of Fe ions. The grain growth mode and conductionmechanism of nickel ferrite ceramics were also discussed. Hexagonal growth spirals and growth hillocks were observed on eachcrystal plane of nickel ferrite single crystals. The growth of nickel ferrite crystals takes place by a spiral dislocation growthmechanism, indicating that the more Fe2+ ion formed in the sites of octahedral B of NiFe2O4 ceramics, the better the electricalconductivity of this ceramic materials.
참고문헌 (18)
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