Synthesis and microstructure of cobalt ferrite nanoparticles
Identifieur interne : 000209 ( PascalFrancis/Curation ); précédent : 000208; suivant : 000210Synthesis and microstructure of cobalt ferrite nanoparticles
Auteurs : L. Ajroudi [France, Tunisie] ; S. Villain [France] ; V. Madigou [France] ; N. Mliki [Tunisie] ; Ch. Leroux [France]Source :
- Journal of crystal growth [ 0022-0248 ] ; 2010.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Cobalt.
English descriptors
- KwdEn :
Abstract
Cobalt ferrites (CoxFe3-xO4) nanoparticles with various compositions were synthesized by a new non-aqueous synthesis method. The cobalt ferrites were characterized by X-ray diffraction and transmission electron microscopy coupled with energy dispersive spectroscopy. The nanoparticles are highly crystallized with a homogeneous chemical composition. The particle size varies from 4 up to 7.5 nm, depending on the cobalt content. The smallest particles, with a size of 4 nm, are obtained for high cobalt content. These particles also have the highest micro-structural strain. Catalytic measurements were realized using Fourier transform infrared spectroscopy. The lowest activation energy and the highest conversion rate are obtained for Co1.8Fe2.4O4 in the 400-500 °C temperature range.
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<term>Fourier transform spectroscopy</term>
<term>Microstructure</term>
<term>Nanoparticles</term>
<term>Nanostructured materials</term>
<term>Particle size</term>
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<front><div type="abstract" xml:lang="en">Cobalt ferrites (Co<sub>x</sub>
Fe<sub>3-x</sub>
O<sub>4</sub>
) nanoparticles with various compositions were synthesized by a new non-aqueous synthesis method. The cobalt ferrites were characterized by X-ray diffraction and transmission electron microscopy coupled with energy dispersive spectroscopy. The nanoparticles are highly crystallized with a homogeneous chemical composition. The particle size varies from 4 up to 7.5 nm, depending on the cobalt content. The smallest particles, with a size of 4 nm, are obtained for high cobalt content. These particles also have the highest micro-structural strain. Catalytic measurements were realized using Fourier transform infrared spectroscopy. The lowest activation energy and the highest conversion rate are obtained for Co<sub>1.8</sub>
Fe<sub>2.4</sub>
O<sub>4</sub>
in the 400-500 °C temperature range.</div>
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O<sub>4</sub>
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