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Stability of the Fe3 +  state in ZnO

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Abstract

We have applied implantation of radioactive 57Mn +  (T1/2 = 1.5 min) at the ISOLDE facility at CERN with 50–60 keV energy to fluences <1012 /cm2 to study the emission Mössbauer spectra from the 14.4 keV transition of the 57Fe daughter atoms. For fluences ≥5 × 1011 57Mn/cm2, the spectra are dominated by the Fe3 +  state exhibiting a slow paramagnetic relaxation. We show that the Fe3 +  state in ZnO saturated by <1012 57Mn/cm2 implantations is unstable. The crystals can be reset by annealing at T > 760 K or storage at room temperature for 12 months, after which they show dominantly the Fe2 +  state for <2 × 1010 57Mn/cm2 implantations. These findings are discussed in terms of diffusion and/or annihilation of implantation-induced defects.

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Authors and Affiliations

  1. School of Physics, University of the Witwatersrand, WITS 2050, Johannesburg, South Africa

    D. Naidoo & H. Masenda

  2. Department of Physics and Astronomy, Aarhus University, 8000, Aarhus C, Denmark

    H. P. Gunnlaugsson & G. Weyer

  3. Science Institute, University of Iceland, Dunhaga 3, 107, Reykjavik, Iceland

    T. E. Mølholt, H. P. Gislason & S. Ólafsson

  4. Laboratorio MDM IMM-CNR, 20864, Agrate Brianza, MB, Italy

    R. Mantovan

  5. School of Physics, University of KwaZulu-Natal, Durban, 4001, South Africa

    K. Bharuth-Ram

  6. EP Division, CERN, 1211, Geneva 23, Switzerland

    K. Johnston

  7. Instituut voor Kern-en Stralingsfysika, University of Leuven, 3001, Leuven, Belgium

    G. Langouche

  8. Helmholtz Forschungszentrum, 14109, Berlin, Germany

    R. Sielemann

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  1. D. Naidoo
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  2. H. P. Gunnlaugsson
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  3. T. E. Mølholt
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  4. R. Mantovan
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  5. H. Masenda
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  6. K. Bharuth-Ram
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  7. K. Johnston
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  8. H. P. Gislason
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  9. G. Langouche
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  10. S. Ólafsson
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  11. G. Weyer
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  12. R. Sielemann
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the ISOLDE Collaboration

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Correspondence to D. Naidoo.

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Naidoo, D., Gunnlaugsson, H.P., Mølholt, T.E. et al. Stability of the Fe3 +  state in ZnO. Hyperfine Interact 221, 45–51 (2013). https://doi.org/10.1007/s10751-012-0730-4

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  • DOI: https://doi.org/10.1007/s10751-012-0730-4

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