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Synthesis and Magnetic Properties of Nanostructured Maghemite

Published online by Cambridge University Press:  31 January 2011

D. Vollath ,
D. V. Szabó ,
R. D. Taylor  and
J. O. Willis
D. Vollath
Affiliation:
Institut für Materialforschung III, Forschungszentrum Karlsruhe, P.O. Box 3640, D-76021 Karlsruhe, Germany
D. V. Szabó
Affiliation:
Institut für Materialforschung III, Forschungszentrum Karlsruhe, P.O. Box 3640, D-76021 Karlsruhe, Germany
R. D. Taylor
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
J. O. Willis
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

Nanocrystalline maghemite, γ–Fe2O3, can be synthesized in a microwave plasma using FeCl3 or Fe3(CO)12 as the precursor. Electron microscopy revealed particle sizes in the range of 5 to 10 nm. In general, this material is superparamagnetic. The magnetic properties are strongly dependent on the precursor. In both cases the production process leads to a highly disordered material with the consequence of a low magnetization. The assumption of a disordered structure is also supported by electron energy loss (EEL) and Mössbauer spectroscopy. The structure of this material shows a nearly identical number of cations on tetrahedral and octahedral lattice sites.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 8 , August 1997 , pp. 2175 - 2182
Copyright
Copyright © Materials Research Society 1997

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