Abstract
The valence state and annealing reactions of Mn/Fe in single crystalline {alpha}-Al{sub 2}O{sub 3} have been determined following low fluence (<10{sup 12} cm{sup - 2}) 60 keV implantations of {sup 57}Mn{sup + } (T{sub 1/2} = 1.5 min) and emission Moessbauer spectroscopy on the {sup 57m}Fe daughter nuclei in the temperature range from 110-700 K. At 110 K, most probe atoms are found in the Fe{sup 2 + } state in amorphous surroundings due to the implantation damage. A fraction of the Fe is found in cubic environment, possibly nano-precipitates of {eta}-Al{sub 2}O{sub 3}. 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 Fe{sup 3 + } on Al sites, and, above room temperature, also as Fe{sup 4 + }. The Fe{sup 3 + } sub-spectrum is masked by slow paramagnetic relaxations following a T{sup 2} dependence, as expected for a two-phonon Raman process. Our data is consistent with data from {sup 57}Co and {sup 57}Fe implantations, suggesting a general increase in the average Fe valence state with lower implantation dose and negligible annealing reactions at room temperature.
Gunnlaugsson, H. P., E-mail: hpg@phys.au.dk;
[1]
Mantovan, R;
[2]
Molholt, T E;
[3]
Naidoo, D;
[4]
Johnston, K;
[5]
Masenda, H;
[4]
Bharuth-Ram, K;
[6]
Langouche, G;
[7]
Olafsson, S;
[3]
Sielemann, R;
[8]
Weyer, G;
[1]
Kobayashi, Y;
[9]
Collaboration: ISOLDE Collaboration
- Aarhus University, Department of Physics and Astronomy (Denmark)
- Laboratorio MDM, IMM-CNR (Italy)
- University of Iceland, Science Institute (Iceland)
- University of the Witwatersrand, School of Physics (South Africa)
- PH Dept, ISOLDE/CERN (Switzerland)
- University of KwaZulu-Natal, School of Physics (South Africa)
- University of Leuven, Instituut voor Kern- en Stralingsfysica (Belgium)
- Helmholtz-Zentrum Berlin fuer Materialien und Energie (Germany)
- Institute of Physical and Chemical Research (RIKEN) (Japan)
Citation Formats
Gunnlaugsson, H. P., E-mail: hpg@phys.au.dk, Mantovan, R, Molholt, T E, Naidoo, D, Johnston, K, Masenda, H, Bharuth-Ram, K, Langouche, G, Olafsson, S, Sielemann, R, Weyer, G, Kobayashi, Y, and Collaboration: ISOLDE Collaboration.
Moessbauer spectroscopy of {sup 57}Fe in {alpha}-Al{sub 2}O{sub 3} following implantation of {sup 57}Mn{sup *}.
Netherlands: N. p.,
2010.
Web.
doi:10.1007/S10751-010-0184-5.
Gunnlaugsson, H. P., E-mail: hpg@phys.au.dk, Mantovan, R, Molholt, T E, Naidoo, D, Johnston, K, Masenda, H, Bharuth-Ram, K, Langouche, G, Olafsson, S, Sielemann, R, Weyer, G, Kobayashi, Y, & Collaboration: ISOLDE Collaboration.
Moessbauer spectroscopy of {sup 57}Fe in {alpha}-Al{sub 2}O{sub 3} following implantation of {sup 57}Mn{sup *}.
Netherlands.
https://doi.org/10.1007/S10751-010-0184-5
Gunnlaugsson, H. P., E-mail: hpg@phys.au.dk, Mantovan, R, Molholt, T E, Naidoo, D, Johnston, K, Masenda, H, Bharuth-Ram, K, Langouche, G, Olafsson, S, Sielemann, R, Weyer, G, Kobayashi, Y, and Collaboration: ISOLDE Collaboration.
2010.
"Moessbauer spectroscopy of {sup 57}Fe in {alpha}-Al{sub 2}O{sub 3} following implantation of {sup 57}Mn{sup *}."
Netherlands.
https://doi.org/10.1007/S10751-010-0184-5.
@misc{etde_22029539,
title = {Moessbauer spectroscopy of {sup 57}Fe in {alpha}-Al{sub 2}O{sub 3} following implantation of {sup 57}Mn{sup *}}
author = {Gunnlaugsson, H. P., E-mail: hpg@phys.au.dk, Mantovan, R, Molholt, T E, Naidoo, D, Johnston, K, Masenda, H, Bharuth-Ram, K, Langouche, G, Olafsson, S, Sielemann, R, Weyer, G, Kobayashi, Y, and Collaboration: ISOLDE Collaboration}
abstractNote = {The valence state and annealing reactions of Mn/Fe in single crystalline {alpha}-Al{sub 2}O{sub 3} have been determined following low fluence (<10{sup 12} cm{sup - 2}) 60 keV implantations of {sup 57}Mn{sup + } (T{sub 1/2} = 1.5 min) and emission Moessbauer spectroscopy on the {sup 57m}Fe daughter nuclei in the temperature range from 110-700 K. At 110 K, most probe atoms are found in the Fe{sup 2 + } state in amorphous surroundings due to the implantation damage. A fraction of the Fe is found in cubic environment, possibly nano-precipitates of {eta}-Al{sub 2}O{sub 3}. 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 Fe{sup 3 + } on Al sites, and, above room temperature, also as Fe{sup 4 + }. The Fe{sup 3 + } sub-spectrum is masked by slow paramagnetic relaxations following a T{sup 2} dependence, as expected for a two-phonon Raman process. Our data is consistent with data from {sup 57}Co and {sup 57}Fe implantations, suggesting a general increase in the average Fe valence state with lower implantation dose and negligible annealing reactions at room temperature.}
doi = {10.1007/S10751-010-0184-5}
journal = []
issue = {1-3}
volume = {198}
journal type = {AC}
place = {Netherlands}
year = {2010}
month = {Jun}
}
title = {Moessbauer spectroscopy of {sup 57}Fe in {alpha}-Al{sub 2}O{sub 3} following implantation of {sup 57}Mn{sup *}}
author = {Gunnlaugsson, H. P., E-mail: hpg@phys.au.dk, Mantovan, R, Molholt, T E, Naidoo, D, Johnston, K, Masenda, H, Bharuth-Ram, K, Langouche, G, Olafsson, S, Sielemann, R, Weyer, G, Kobayashi, Y, and Collaboration: ISOLDE Collaboration}
abstractNote = {The valence state and annealing reactions of Mn/Fe in single crystalline {alpha}-Al{sub 2}O{sub 3} have been determined following low fluence (<10{sup 12} cm{sup - 2}) 60 keV implantations of {sup 57}Mn{sup + } (T{sub 1/2} = 1.5 min) and emission Moessbauer spectroscopy on the {sup 57m}Fe daughter nuclei in the temperature range from 110-700 K. At 110 K, most probe atoms are found in the Fe{sup 2 + } state in amorphous surroundings due to the implantation damage. A fraction of the Fe is found in cubic environment, possibly nano-precipitates of {eta}-Al{sub 2}O{sub 3}. 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 Fe{sup 3 + } on Al sites, and, above room temperature, also as Fe{sup 4 + }. The Fe{sup 3 + } sub-spectrum is masked by slow paramagnetic relaxations following a T{sup 2} dependence, as expected for a two-phonon Raman process. Our data is consistent with data from {sup 57}Co and {sup 57}Fe implantations, suggesting a general increase in the average Fe valence state with lower implantation dose and negligible annealing reactions at room temperature.}
doi = {10.1007/S10751-010-0184-5}
journal = []
issue = {1-3}
volume = {198}
journal type = {AC}
place = {Netherlands}
year = {2010}
month = {Jun}
}