Varanda, L. C. [UNESP]Jafelicci, M. [UNESP]Goya, G. F.2014-05-272014-05-272001-12-01Journal of Magnetism and Magnetic Materials, v. 226-230, n. PART II, p. 1933-1935, 2001.0304-8853http://hdl.handle.net/11449/66625Spindle-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.1933-1935engFine particlesIron particlesMagnetic pigmentsMagnetic recording mediaHematite particlesHydrogen reductionIron-finesMagnetization dataMossbauerNano-sizedOxide surfaceParticle distributionsRoom temperatureSilica-CoatedSpinel structureSuperparamagneticsSurface layersSurface oxidationsTEMHematiteIron oresMagnetic devicesMagnetic propertiesMagnetic recordingMagnetismMolybdenum oxideReaction kineticsSilicaSuperparamagnetismSurface structureMagnetic bubblesArtigo10.1016/S0304-8853(00)00668-5WOS:000170628400311Acesso restrito2-s2.0-33748695284