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Synthesis of pure amorphous Fe2O3

Published online by Cambridge University Press:  31 January 2011

X. Cao ,
R. Prozorov ,
Yu. Koltypin ,
G. Kataby ,
I. Felner  and
A. Gedanken
X. Cao
Affiliation:
Department of Chemistry, Bar-Ilan University, Ramat-Gan, Israel, 52900
R. Prozorov
Affiliation:
Department of Physics, Bar-Ilan University, Ramat-Gan, Israel, 52900
Yu. Koltypin
Affiliation:
Department of Chemistry, Bar-Ilan University, Ramat-Gan, Israel, 52900
G. Kataby
Affiliation:
Department of Chemistry, Bar-Ilan University, Ramat-Gan, Israel, 52900
I. Felner
Affiliation:
Racah Institute of Physics, Hebrew University, Jerusalem, Israel
A. Gedanken
Affiliation:
Department of Chemistry, Bar-Ilan University, Ramat-Gan, Israel, 52900
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Abstract

A method for the preparation of pure amorphous Fe2O3 powder with particle size of 25 nm is reported in this article. Pure amorphous Fe2O3 can be simply synthesized by the sonication of neat Fe(CO)5 or its solution in decalin under an air atmosphere. The Fe2O3 nanoparticles are converted to crystalline Fe3O4 nanoparticles when heated to 420 °C under vacuum or when heated to the same temperature under a nitrogen atmosphere. The crystalline Fe3O4 nanoparticles were characterized by x-ray diffraction and M¨ossbauer spectroscopy. The Fe2O3 amorphous nanoparticles were examined by Transmission Electron Micrography (TEM), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), and Quantum Design SQUID magnetization measurements. The magnetization of pure amorphous Fe2O3 at room temperature is very low (<1.5 emu/g) and it crystallizes at 268 °C.

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Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 2 , February 1997 , pp. 402 - 406
Copyright
Copyright © Materials Research Society 1997

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