Speaker
Haraldur Gunnlaugsson
(Department of Physics and Astronomy, Aarhus University, DK-8000 Århus C, Denmark)
Description
Radioactive 57Mn (T½ = 1.5 min) has been implanted into Al2O3 single crystals held at 110 – 666 K at the ISOLDE facility at CERN. Mössbauer emission spectra were measured on the 14.4 keV γ-rays of the daughter 57*Fe nucleis. The analysis of the obtained Mössbauer spectra reveals four spectral components listed below (see Fig. 1) assigned as follows: Dam: A quadrupole-split component assigned to Fe2+ in heavily damaged, possibly amorphous local environment created in the implantation process. S1: A single line due to Fe in cubic environment. The properties of this line are inconsistent with interstitial Fe; it is suggested to originate from Fe in nano-precipitates of -Al2O3. D1: A quadrupole-split component, which, on the basis of the hyperfine parameters and temperature dependence, is suggested to be due to Fe4+. Sx: A Fe3+ magnetically-split sextet component showing slow paramagnetic relaxation. Analysis of the line broadening of this sextet component with the method described in [1] shows it to be compatible with (slow) spin-lattice relaxations. In-depth argumentation for the assignments of components will be presented and discussed together with comparison to supportive data obtained previously from stable 57Fe [2] and radioactive 57Co implantations [3].
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Primary author
Haraldur Gunnlaugsson
(Department of Physics and Astronomy, Aarhus University, DK-8000 Århus C, Denmark)
Co-authors
D. Naidoo
(School of Physics, University of the Witwatersrand, WITS 2050, South Africa)
G. Langouche
(Instituut voor Kern-en Stralings fysika, University of Leuven, B-3001 Leuven, Belgium)
G. Weyer
(Department of Physics and Astronomy, Aarhus University, DK-8000 Århus C, Denmark)
K. Bharuth-Ram
(of Physics, University of KwaZulu-Natal, Durban 4001, South Africa)
K. Johnston
(PH Dept, ISOLDE/CERN, 1211 Geneva 23, Switzerland)
R. Mantovan
(Laboratorio MDM, IMM-CNR, Via Olivetti 2, 20041 Agrate Brianza (MB), Italy.)
R. Sielemann
(Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany)
S. Ólafsson
(Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, Iceland)
T. E. Mølholt
(Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavík, Iceland)
