Luminescence and EPR spectroscopy of neutron-irradiated single crystals of magnesium aluminium spinel. (July 2016)

• Record Type: Journal Article
• Authors: Mironova-Ulmane, N.; Skvortsova, V.; Pavlenko, A.; Feldbach, E.; Lushchik, A.; Lushchik, Ch.; Churmanov, V.; Ivanov, D.; Ivanov, V.; Aleksanyan, E.
• Is Part Of: Radiation measurements. Volume 90(2016:Jul.)
• Page Start: 122
• Page End: 126
• Publication Date: 2016-07
• Subjects: Magnesium aluminium spinel -- Photo- and cathodo-luminescence -- EPR; Nuclear emulsions -- Periodicals; Particle tracks (Nuclear physics) -- Periodicals; Thermoluminescence -- Periodicals; Cosmic rays -- Periodicals; Radiation -- Measurement -- Periodicals; Radiometry -- Periodicals; Radiation Monitoring -- Periodicals; Émulsions nucléaires -- Périodiques; Particules (Physique nucléaire) -- Traces -- Périodiques; Thermoluminescence -- Périodiques; Rayonnement cosmique -- Périodiques; Radiométrie -- Périodiques; 539.77
• DOI: 10.1016/j.radmeas.2015.12.020
• Languages: English
• ISSNs: 1350-4487

Abstract

Abstract: Neutron irradiated single crystals of stoichiometric MgAl2 O4 and MgAl2 O4 :Mn 2+ (0.15 wt. %) were studied using the methods of luminescence spectroscopy and versions of electron paramagnetic resonance. In stoichiometric MgAl2 O4 :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. Highlights: Photo-, cathodo- and thermally stimulated luminescence; conventional and pulse EPR. In irradiated spinel Mn 2+ ions are moved from tetrahedral to octahedral interstices. An electron from an F + centre is in superhyperfine interaction with 27 Al nuclei.