Microwave flash synthesis of iron and magnetite particles by disproportionation of ferrous alcoholic solutions

This paper reports the microwave-hydrothermal treatment of alcoholic solutions of ferrous chloride (FeCl₂) and sodium ethoxide (EtONa) solutions with a microwave autoclave designed by the authors (the RAMO system). Depending on the initial concentrations, hematite (α-Fe₂O₃), spinel phase (Fe₃ ₋ ₓ O₄...

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Bibliographic Details
Published in:Journal of materials science 2002-12, Vol.37 (23), p.5153-5158
Main Authors: Caillot, T, Aymes, D, Stuerga, D, Viart, N, Pourroy, G
Format: Article
Language:English
Subjects:
autoclaves
Autoclaving
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Disproportionation
energy
Exact sciences and technology
ferrous chloride
Fine-particle systems
Grain size
Hematite
Hydrothermal treatment
iron
Iron chlorides
Iron oxides
Magnetic properties and materials
Magnetite
Materials science
Nanocomposites
Physics
powders
Small particles and nanoscale materials
Studies of specific magnetic materials
X-ray diffraction
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Summary:This paper reports the microwave-hydrothermal treatment of alcoholic solutions of ferrous chloride (FeCl₂) and sodium ethoxide (EtONa) solutions with a microwave autoclave designed by the authors (the RAMO system). Depending on the initial concentrations, hematite (α-Fe₂O₃), spinel phase (Fe₃ ₋ ₓ O₄) or iron-magnetite (Fe⁰-Fe₃O₄) nanocomposites are obtained with a lower grain size compared to conventional composites. Indeed, X-ray diffraction (XRD) analysis reveals grain sizes close to 20 nm for magnetite and 60 nm for metallic iron. However, the amount of metal is smaller (close to 11%). Furthermore, these particles are inert in the ambient atmosphere. Consequently, the RAMO (French acronym of Reacteur Autoclave MicroOnde) system appears to provide an efficient source of energy in rapidly producing inert powders of iron, magnetite and iron-magnetite composites.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1021028809382