Magnetic properties of spindle-type iron fine particles obtained from hematite
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Elsevier
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Resumo
Spindle-type iron fine particles have been prepared by reduction of silica-coated-hematite particles. Hydrogen reduction of the coated-hematite cores yielded uniform spindle-type iron particles, which were stabilized by surface oxidation. Narrow particle distributions are observed from TEM measurements. X-ray, Mössbauer and magnetization data are in agreement with the presence of nanosized α-Fe particles, having surface layer of spinel structure oxide. Mössbauer spectra show that the oxide surface is superparamagnetic at room temperature. © 2001 Elsevier Science B.V. All rights reserved.
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Fine particles , Iron particles , Magnetic pigments , Magnetic recording media , Hematite particles , Hydrogen reduction , Iron-fines , Magnetization data , Mossbauer , Nano-sized , Oxide surface , Particle distributions , Room temperature , Silica-Coated , Spinel structure , Superparamagnetics , Surface layers , Surface oxidations , TEM , Hematite , Iron ores , Magnetic devices , Magnetic properties , Magnetic recording , Magnetism , Molybdenum oxide , Reaction kinetics , Silica , Superparamagnetism , Surface structure , Magnetic bubbles
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Inglês
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Journal of Magnetism and Magnetic Materials, v. 226-230, n. PART II, p. 1933-1935, 2001.
