About thermal stability of the F+ centers in MgO single crystals irradiated by fast neutrons or energetic Ar ions
Baubekova G. Assylbayev R. Podelinska A. Seeman V. Shablonin E. Vasilchenko E. Lushchik A.
January 2025Elsevier Ltd
Radiation Measurements
2025#180
Single crystals of MgO have been exposed to 70-MeV argon ions with varying fluence of 4 × 1012-3 × 1014 cm−2. The dependence of radiation-induced optical absorption (RIOA) at 1.7–6.5 eV on irradiation fluence has been analyzed. The EPR signal of the F+ center in ion-irradiated crystal has been detected and via the EPR parameters proved to be the same as in well-studied neutron-irradiated MgO crystals. The precise isothermal annealing of the F + EPR signal has been performed for the first time in a temperature range of 400–1100 K for both a fast neutron irradiated (2.7 × 1018 cm−2) and Ar-irradiated (3 × 1014 cm−2) MgO crystals. In both cases, the F + EPR decay starts only above 700 K and ends at 950–1060 K, depending on irradiation type. Using the same stepwise annealing procedure, the changes in RIOA for ion-irradiated samples have also been analyzed and possible reasons for the discrepancy in the thermal behaviour of optical and EPR F + -absorption have been considered.
Electron paramagnetic resonance , Irradiation by energetic ions or neutrons , Isochronal thermal annealing , MgO single crystals , Oxygen-related frenkel defects , Radiation-induced optical absorption
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L.N. Gumilyov Eurasian National University, Munaitpasov Str. 13, Astana, 010008, Kazakhstan
Margulan University, Toraigyrov str. 58, Pavlodar, 140000, Kazakhstan
Institute of Physics, University of Tartu, W. Ostwald Str. 1, Tartu, 50411, Estonia
L.N. Gumilyov Eurasian National University
Margulan University
Institute of Physics
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