☆ 4.5 Article

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

SOLID STATE SCIENCES (2008)

Journal

SOLID STATE SCIENCES

Volume 10, Issue 5, Pages 550-556

Publisher

ELSEVIER

DOI: 10.1016/j.solidstatesciences.2007.10.004

Keywords

spinel; iron cobaltites; cobalt ferrites; spinodal decomposition; self-organization

Categories

Chemistry, Inorganic & Nuclear Chemistry, Physical Physics, Condensed Matter

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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 degrees C. The samples obtained at 900 degrees C are made of a single spinel phase in which CO2+ and Fe3+ ions area distributed in both octahedral and tetrahedral sites and Co3+ ions are only located in the octahedral sublattice. For heat treatments carried out at 600 degrees C two spinel phases are formed. according to the phase diagrams. Pure Co1.7Fe1.3O4 oxide annealed at 700 degrees 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. (C) 2007 Elsevier Masson SAS. All rights reserved.

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