6533b831fe1ef96bd12997f8

RESEARCH PRODUCT

Luminescence and EPR spectroscopy of neutron-irradiated single crystals of magnesium aluminium spinel

Aleksandr LushchikCh. LushchikNina Mironova-ulmaneA. PavlenkoEduard FeldbachD. M. IvanovV. IvanovE. AleksanyanV. N. ChurmanovV. Skvortsova

subject

Materials sciencePhotoluminescenceNuclear TheoryAnalytical chemistry02 engineering and technologyengineering.material01 natural scienceslaw.inventionCondensed Matter::Materials Sciencelaw0103 physical sciencesPhysics::Atomic and Molecular ClustersNuclear Experiment010306 general physicsElectron paramagnetic resonanceSpectroscopyInstrumentationHyperfine structureRadiationPulsed EPRSpinel021001 nanoscience & nanotechnologyFast fissionengineeringCondensed Matter::Strongly Correlated Electrons0210 nano-technologyLuminescenceNuclear chemistry

description

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.

yearjournalcountryeditionlanguage
2016-07-01Radiation Measurements
https://doi.org/10.1016/j.radmeas.2015.12.020