Grain Growth in Fe3O4 |
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Authors: | M F YAN |
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Affiliation: | Bell Laboratories, Murray Hill, New Jersey 07974 |
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Abstract: | Sintering and microstructural evolution were studied in Fe3O4 as a model system for spinel ferrites. Fe3O4 powder, purified by the salt-crystallization method, was sintered to ~99.5% density in a CO-CO2 atmosphere. The p O2 Of the sintering atmosphere drastically affects the microstructure (grain size) of sintered Fe3O4 without significantly affecting density. The measured grain-boundary mobilities, M , of Fe3O4 fit the equation M=M 0( T ) p O2?1/2 with M 0( T ) = 2.5×105 exp-(609kJ·mol-1/ RT ](m/s)(N/m2)?l. The grain-boundary migration process appeared to be pore-drag controlled, with lattice diffusion of oxygen as the most likely rate-limiting step. |
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