Luminescence and EPR spectroscopy of neutron-irradiated single crystals of magnesium aluminium spinel.
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| Title: | Luminescence and EPR spectroscopy of neutron-irradiated single crystals of magnesium aluminium spinel. |
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| Authors: | Mironova-Ulmane, N.1 nina@cfi.lu.lv, Skvortsova, V.1, Pavlenko, A.1, Feldbach, E.2, Lushchik, A.2, Lushchik, Ch.2, Churmanov, V.3, Ivanov, D.3, Ivanov, V.3, Aleksanyan, E.4 |
| Source: | Radiation Measurements. Jul2016, Vol. 90, p122-126. 5p. |
| Subjects: | Electron paramagnetic resonance spectroscopy, Neutrons, Single crystals, Spinel, Irradiation, Cathodoluminescence, Photoluminescence |
| Abstract: | Neutron irradiated single crystals of stoichiometric MgAl 2 O 4 and MgAl 2 O 4 :Mn 2+ (0.15 wt. %) were studied using the methods of luminescence spectroscopy and versions of electron paramagnetic resonance. In stoichiometric MgAl 2 O 4 :Mn 2+ single crystals, the transition of a part of manganese impurity ions from tetrahedral to octahedral coordination, caused by irradiation with fast fission neutrons, is detected using photoluminescence spectra. This fact confirms the partial inversion of a normal spinel due to neutron-irradiation. Using pulse EPR technique it is shown that an electron in the field of oxygen vacancy (i.e. from neutron-irradiation induced F + centres, which are spatially separated from each other) is in hyperfine interaction only with neighbouring 27 Al nuclei with nuclear spin 5/2. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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