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Magnetic properties of spindle-type iron fine particles obtained from hematite

Authors
  • Varanda, L. C.
  • Jafelicci, M.
  • Goya, G. F.
Publication Date
Dec 01, 2001
Source
Acervo Digital da Unesp
Keywords
Language
English
License
Unknown
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Abstract

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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