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Thin films of Co1.7Fe1.3O4 prepared by radio frequency sputtering - the first step towards their spinodal decomposition

Bui, Thi Mai Anh and Le Trong, Hoa and Presmanes, Lionel and Barnabé, Antoine and Bonningue, Corine and Tailhades, Philippe Thin films of Co1.7Fe1.3O4 prepared by radio frequency sputtering - the first step towards their spinodal decomposition. (2014) CrystEngComm (16). 3359-3365. ISSN 1466-8033

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Official URL: http://dx.doi.org/10.1039/c3ce42588f

Abstract

Pure thin films of Co1.7Fe1.3O4 spinel iron cobaltites were prepared for the first time by radio frequency sputtering. Such films are made of small crystallites of about 20 to 30 nm in diameter. Because Co1.7Fe1.3O4 films have a composition located in the miscibility gap of Fe3O4–Co3O4, they can be submitted to spinodal transformation below about 900 °C. This transformation was also confirmed at 600 °C by X-ray diffraction and transmission electron microscopy studies. It was demonstrated however that this spinodal transformation occurs after only a few hours at low temperature. Indeed, after annealing in air at 300 to 450 °C for a few hours, the spinodal transformation leading to two-phase spinels, one rich in iron and the other rich in cobalt, was clearly revealed by Raman spectroscopy and electrical measurements.

Item Type:Article
Additional Information:Thanks to the Royal Society of Chemistry. The definitive version is available at http://www.rsc.org The original PDF of the article can be found at CrystEngComm website : http://pubs.rsc.org/en/Content/ArticleLanding/2014/CE/c3ce42588f#!divAbstract
HAL Id:hal-01153084
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:21 Jul 2014 15:32

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