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Phase decomposition study in CoxFe3−xO4 iron cobaltites: Synthesis and structural characterization of the spinodal transformation

Le Trong , H. and Barnabé, Antoine and Presmanes, Lionel and Tailhades, Philippe Phase decomposition study in CoxFe3−xO4 iron cobaltites: Synthesis and structural characterization of the spinodal transformation. (2008) Solid State Sciences, vol. 10 (n° 5). pp. 550-556. ISSN 1293-2558

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Official URL: http://dx.doi.org/10.1016/j.solidstatesciences.2007.10.004

Abstract

CoxFe3−xO4 iron cobaltites (1.21 < x < 2.35) have been prepared in the form of submicronic particles from mixed oxalic precursors heat treated at 900 and 600 °C. The samples obtained at 900 °C are made of a single spinel phase in which Co2+ and Fe3+ ions are distributed in both octahedral and tetrahedral sites and Co3+ ions are only located in the octahedral sublattice. For heat treatments carried out at 600 °C two spinel phases are formed according to the phase diagrams. Pure Co1.7Fe1.3O4 oxide annealed at 700 °C progressively transformed into two iron-rich and cobalt-rich spinel phases, respectively. More than 120 h of heat treatment is required to get the complete decomposition of the pristine oxide. At the beginning this oxide is submitted to a spinodal transformation. Alternating regions of iron-rich and cobalt-rich spinels are then created. The periodicity of the nanostructuration of the material is estimated to be close to 5 nm.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Solid State Sciences website :http://www.sciencedirect.com/science/journal/12932558
Audience (journal):International peer-reviewed journal
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Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Celine Cabaup

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