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Mössbauer and vibrational DOS studies of diluted magnetic tin oxides and nano iron oxides

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LACAME 2012

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Abstract

The magnetic properties and Mössbauer results for SnO2 doped with 57Fe are reviewed, and the values of isomer shift and quadrupole splitting are compared with the results obtained by ab initio calculations. It is concluded that the exchange interactions between oxygen defects and magnetic atoms are responsible for long range magnetic interactions of dilute Fe ions dispersed in SnO2. Fe atom precipitated clusters may be formed in highly Fe doped SnO2 samples by annealing at relatively high temperatures for several hours. The reduction of the particle size to nano-scale dimensions induces magnetization, which can be associated with oxygen defects. We have measured the nuclear inelastic scattering (NIS) spectra of Fe oxides, and 57Fe and (Co or Mn) doped SnO2 synthesized mainly by sol–gel methods and we have derived the vibration density of states (VDOS). The local phonons are sensitive to the presence of precipitated clusters.

Proceedings of the Thirteenth Latin American Conference on the Applications of the Mössbauer Effect (LACAME 2012), Medellín, Colombia, 11–16 November 2012.

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Authors and Affiliations

  1. School of Engineering, The University of Tokyo, Tokyo, Japan

    K. Nomura & A. I. Rykov

  2. Mössbauer Effect Data Centre, Dalian, China

    A. I. Rykov

  3. Universidad Nacional de La Plata, La Plata, Argentina

    A. M. Mudarra Navarro, C. E. Rodriguez Torres & L. A. Errico

  4. University of Antioquia, Madellín, Colombia

    C. A. Barrero

  5. Japan Synchrotron Radiation Research Institute, Hyogo, Japan

    Y. Yoda

Authors
  1. K. Nomura
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  2. A. I. Rykov
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  3. A. M. Mudarra Navarro
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  4. C. E. Rodriguez Torres
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  5. L. A. Errico
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  6. C. A. Barrero
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  7. Y. Yoda
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Corresponding author

Correspondence to K. Nomura .

Editor information

Editors and Affiliations

  1. Instituto de Física, Universidad de Antioquia, Medellín, Colombia

    C. A. Barrero Meneses

  2. Centro de Ciências Exatas Departamento de Física, Universidade Federal do Espírito Santo, Vitória, ES, Brazil

    E. Passamani Caetano

  3. Departamento de Física y Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Argentina

    C. E. Rodríguez Torres

  4. Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile

    C. Pizarro

  5. Departamento de Física, Universidad del Valle, Cali, Colombia

    L. E. Zamora Alfonso

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Nomura, K. et al. (2013). Mössbauer and vibrational DOS studies of diluted magnetic tin oxides and nano iron oxides. In: Meneses, C.A.B., Caetano, E.P., Torres, C.E.R., Pizarro, C., Alfonso, L.E.Z. (eds) LACAME 2012. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6482-8_3

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