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Sur des oxydes de cérium contenant du fer nanostructurés et de morphologies contrôlées

Abstract : This work deals with the synthesis and characterization of Ce1−xFexO2−x2 nanoparticles.Two different synthesis routes were used : the coprecipitation technique and the microwaveassisted synthesis route. This later allowed the obtention of controled morphologies such asnanocubic or nanorod particles, characterized by HRTEM. Compared to hydrothermal synthesisroute the time of reaction was limited to one hour. X-Ray Diffraction analysis showedthat the lattice parameter decreases versus the iron content. Local environment and oxidationstate of iron were analyzed by Mössbauer, EPR and XANES spectroscopies showingthe presence of two kinds of iron sites : isolated (distorted) octahedral sites and clusters. Acomparison between both synthesis routes shows clearly the differences at a local scale. Thenanoparticles were then further characterized during annealing and under different atmospheres.The solid solution undergoes a demixtion phenomenon around 600°C which does notdepend on the atmosphere conditions.
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Iona Moog. Sur des oxydes de cérium contenant du fer nanostructurés et de morphologies contrôlées. Autre. Université Sciences et Technologies - Bordeaux I, 2012. Français. ⟨NNT : 2012BOR14583⟩. ⟨tel-00806578⟩

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