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Hyperfine Interactions

, Volume 195, Issue 1–3, pp 99–104 | Cite as

Mössbauer characterization of surface-coated magnetic nanoparticles for applications in transformers

  • E. S. Leite
  • A. C. Oliveira
  • V. K. Garg
  • P. P. C. Sartoratto
  • W. R. Viali
  • P. C. Morais
Article

Abstract

In this study the synthesis of very small magnetite nanoparticles is reported. Analysis of the (311) X-ray diffraction line indicates nanoparticle with 2.2 nm average diameter. The as-synthesized nanosized magnetite sample was submitted to a chemical oxidation process for conversion to maghemite. However, the yielding of the chemical oxidation process, as indicated by the analysis of the Mössbauer data, was about 20%. This finding indicates a strong size-dependence of the oxidation process, reducing the yielding of the chemical process used as the nanoparticle size reduces down to extremely low values.

Keywords

Mössbauer Magnetite nanoparticle Oxidation process Size-dependence Magnetic fluid Transformer 

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References

  1. 1.
    Sartoratto, P.P.C., Neto, A.V.S., Lima, E.C.D., Rodrigues de Sá, A.L.C., Morais, P.C.J.: Appl. Phys. 97, 10Q917 (2005)CrossRefGoogle Scholar
  2. 2.
    van Ewijk, G.A., Vroege, F.J., Philipse, A.P.: J. Magn. Magn. Mater. 201, 31 (1999)CrossRefADSGoogle Scholar
  3. 3.
    Cullity, B.D.: Elements of X-ray Diffraction, pp. 101. Addison Wesley, Reading (1978)Google Scholar
  4. 4.
    Daou, T.J., Pourroy, G., Bégin-Colin, S., Grenèche, J.M., Ulhaq-Bouillet, C., Legaré, P., Bernhardt, P., Leuvrey, C., Rogez, G.: Chem. Mater. 18, 4399 (2006)CrossRefGoogle Scholar
  5. 5.
    Morais, P.C., Skeff Neto, K.J.: Appl. Phys. 54, 307 (1983)CrossRefGoogle Scholar
  6. 6.
    Li, X., Kutal, C.J.: Alloys Comp. 349, 264 (2003)CrossRefGoogle Scholar
  7. 7.
    Sprenkel-Segel, E.L.: J. Geophys. Res. 75, 6618 (1970)CrossRefADSGoogle Scholar
  8. 8.
    Greenwood, N.N., Gibb, T.C.: Mössbauer Spectroscopy, pp. 241. Chapman and Hall, London (1971)Google Scholar
  9. 9.
    Golden, D.C., Ming, D.W., Bowen, L.H., Morris, R.V., Lauer, H.V. Jr.: Clays Clay Miner. 42, 53 (1994)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • E. S. Leite
    • 1
  • A. C. Oliveira
    • 1
  • V. K. Garg
    • 1
  • P. P. C. Sartoratto
    • 2
  • W. R. Viali
    • 2
  • P. C. Morais
    • 1
  1. 1.Instituto de Física, Núcleo de Física AplicadaUniversidade de BrasíliaBrasíliaBrazil
  2. 2.Instituto de QuímicaUniversidade Federal de GoiásGoiâniaBrazil

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