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Characterization of Fe states in dilute 57 Mn implanted SnO 2 film |
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| Authors: | H. P. Gunnlaugsson K. Nomura T. E. Mølholt S. Shayestehaminzadeh K. Johnston R. Mantovan H. Masenda M. Ncube K. Bharuth-Ram H. Gislason G. Langouche D. Naidoo S. Ólafsson G. Weyer |
| Affiliation: | 1. Department of Physics and Astronomy, Aarhus University, 8000, Aarhus, Denmark 2. School of Engineering, The University of Tokyo, Tokyo, 113-8656, Japan 3. Science Institute, University of Iceland, 107, Reykjavík, Iceland 4. PH Department, ISOLDE/CERN, 1211, Geneva 23, Switzerland 5. Laboratorio MDM, IMM-CNR, Via Olivetti 2, 20864, Agrate Brianza, MB, Italy 6. School of Physics, University of the Witwatersrand, Johannesburg, South Africa 7. School of Physics, Durban University of Technology, Durban, 4000, South Africa 8. Instituut voor Kern-en Stralings fysika, University of Leuven, 3001, Leuven, Belgium |
| Abstract: | States of dilute Fe in SnO2 have been monitored using 57Fe emission Mössbauer spectroscopy following implantation of 57Mn (T 1/2 = 85.4 s) in the temperature range from 143 K to 711 K. A sharp annealing stage is observed at ~330 K where the Fe3?+?/Fe2?+? ratio shows a marked increase. It is suggested that this annealing stage is due to the dissociation of Mn-VO pairs during the lifetime of 57Mn; the activation energy for this dissociation is estimated to be 0.9(1) eV. Fe3?+? is found in a paramagnetic state showing spin-lattice relaxation rates consistent with an expected T 2 dependence derived for a Raman process. In addition, a sharp lined doublet in the Mössbauer spectra is interpreted as due to recoil produced interstitial Fe. |
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