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Characterization of oxygen passivated iron nanoparticles and thermal evolution to γ-Fe2O3

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Abstract

Nanocrystalline iron powders have been prepared by the inert gas evaporation method. After preparation the material has been passivated by pure oxygen and air exposure. In the present paper we describe new characterization studies of this sample by Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), X-ray Absorption Spectroscopy (XAS), Electron Energy Loss Spectroscopy (EELS) and Mössbauer Spectroscopy (MS), giving a complete chemical and structural characterization of the nanocomposite material in order to correlate its microstructure with its singular magnetic behavior.

This nanocomposite was later heated following different thermal treatments. It was found that the sample heated successively in high vacuum (10−7 torr) at 383 K for 1 h and under a residual oxygen pressure of 4 × 10−4 torr at 573 K for 3 h, results in a powder formed by nanoparticles of γ-Fe2O3 as stated from XRD, XAS and MS. This material is stable during several years and behaves almost totally like superparamagnetic at room temperature.

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Authors and Affiliations

  1. Dpto. de Química Inorgánica, Centro de Investigaciones Científicas Isla de la Cartuja, Instituto de Ciencia de Materiales de Sevilla and, Avda. Américo Vespucio s/n, 41092-, Sevilla, Spain

    T. C. Rojas, J. C. Sánchez-López & A. Fernández

  2. Laboratoire de Physique de l'Etat Condensé, UMR CNRS 6087, Université du Maine, 72085, Le Mans Cedex, France

    J. M. Greneche

  3. Dpto. de Física de la Materia Condensada, Instituto de Ciencia de Materiales de Sevilla and, P.O. Box 1065, 41080-, Sevilla, Spain

    A. Conde

Authors
  1. T. C. Rojas
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  3. J. M. Greneche
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  4. A. Conde
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  5. A. Fernández
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Rojas, T.C., Sánchez-López, J.C., Greneche, J.M. et al. Characterization of oxygen passivated iron nanoparticles and thermal evolution to γ-Fe2O3 . Journal of Materials Science 39, 4877–4885 (2004). https://doi.org/10.1023/B:JMSC.0000035328.99440.8d

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  • DOI: https://doi.org/10.1023/B:JMSC.0000035328.99440.8d

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