Abstract
The thermal stability of anion interstitials (H centers) was studied in neutron irradiated single crystals of MgO. The ESR spectra of H centers were investigated, the annealing of their ESR absorption and the optical absorption of F+ centers was measured. Both defects were found to disappear in the 650—750 K temperature region. Thermal decay of H centers was investigated using fractional thermoactivation spectroscopy and a common high-temperature (300—775 K) thermoluminescence, combined with the method of controlled X-colouration. A possible mechanism for the thermal destruction of complex anion Frenkel defects in MgO, including the hopping diffusion of neutral oxygen interstitials to F centres, is proposed.
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