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Etude des propriétés structurales et magnétiques de nanoparticules de maghémite dispersées dans une matrice de silice

Abstract : The objectives of this thesis concern the study of structural and magnetic behavior of powders consisting of nanoparticles of maghemite (γ-Fe2O3) of controlled size and morphology (4 ± 1 nm) obtained by coprecipitation of metal salts and then dispersed with different concentrations in a silica matrix by sol-gel process. The first part of our work was to study the structural stability of the nanoparticles by laser irradiation and depending on the temperature of treatment to control the phase transition to maghemite γ-Fe2O3 into hematite α-Fe2O3 and Epsilon. The second part of the work concerned the study of magnetic properties of nanocomposites based on the mass concentration of nanoparticles. The objective was to characterize the nature of interactions between magnetic nanoparticles.
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Submitted on : Tuesday, June 28, 2011 - 3:23:20 PM
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2011LEMA1006.pdf
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  • HAL Id : tel-00604263, version 1

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Yassine El Mendili. Etude des propriétés structurales et magnétiques de nanoparticules de maghémite dispersées dans une matrice de silice. Autre [cond-mat.other]. Université du Maine, 2011. Français. ⟨NNT : 2011LEMA1006⟩. ⟨tel-00604263⟩

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