Mössbauer spectroscopy of 57Fe in ?-Al2O3 following implantation of 57Mn* (Articolo in rivista)

Type
Label
  • Mössbauer spectroscopy of 57Fe in ?-Al2O3 following implantation of 57Mn* (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s10751-010-0184-5 (literal)
Alternative label
  • H. P. Gunnlaugsson; R. Mantovan; T. E. Mølholt; D. Naidoo; K. Johnston; H. Masenda; K. Bharuth-Ram; G. Langouche; S. Ólafsson; R. Sielemann; G. Weyer; Y. Kobayashi; and the ISOLDE collaboration (2010)
    Mössbauer spectroscopy of 57Fe in ?-Al2O3 following implantation of 57Mn*
    in Hyperfine interactions (Dordr., Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • H. P. Gunnlaugsson; R. Mantovan; T. E. Mølholt; D. Naidoo; K. Johnston; H. Masenda; K. Bharuth-Ram; G. Langouche; S. Ólafsson; R. Sielemann; G. Weyer; Y. Kobayashi; and the ISOLDE collaboration (literal)
Pagina inizio
  • 5 (literal)
Pagina fine
  • 13 (literal)
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  • http://www.springerlink.com/content/e831wv32kw704465/ (literal)
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  • 198 (literal)
Rivista
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  • 9 (literal)
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  • Department of Physics and Astronomy, Aarhus University, 8000 Århus C, Denmark Laboratorio MDM, IMM-CNR, Via Olivetti 2, 20041 Agrate Brianza (MB), Italy Science Institute, University of Iceland, Dunhaga 3, 107 Reykjavík, Iceland School of Physics, University of the Witwatersrand, Private Bag 3, WITS 2050, South Africa PH Dept, ISOLDE/CERN, 1211 Geneva 23, Switzerland School of Physics, University of KwaZulu-Natal, Durban 4001, South Africa Instituut voor Kern- en Stralingsfysica, University of Leuven, 3001 Leuven, Belgium Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan (literal)
Titolo
  • Mössbauer spectroscopy of 57Fe in ?-Al2O3 following implantation of 57Mn* (literal)
Abstract
  • The valence state and annealing reactions of Mn/Fe in single crystalline ?-Al2O3 have been determined following low fluence (<1012 cm - 2) 60 keV implantations of 57Mn + (T1/2 = 1.5 min) and emission Mössbauer spectroscopy on the 57m Fe daughter nuclei in the temperature range from 110-700 K. At 110 K, most probe atoms are found in the Fe2 + state in amorphous surroundings due to the implantation damage. A fraction of the Fe is found in cubic environment, possibly nano-precipitates of ?-Al2O3. This site is found to disappear from the spectra above 500 K. Annealing of the damage sites at increasing temperatures leads first to increased incorporation of the probe atoms as Fe3 + on Al sites, and, above room temperature, also as Fe4 + . The Fe3 + sub-spectrum is masked by slow paramagnetic relaxations following a T2 dependence, as expected for a two-phonon Raman process. Our data is consistent with data from 57Co and 57Fe implantations, suggesting a general increase in the average Fe valence state with lower implantation dose and negligible annealing reactions at room temperature. (literal)
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