РАДИАЦИОННОЕ ДЕФЕКТООБРАЗОВАНИЕ В СТЕАТИТОВОЙ КЕРАМИКЕ СК-1

Аннотация

Object of research: the defects formation in steatite ceramics SK-1 under high-dose y- and n-y-reactor radiation. Purpose of work: the purpose of this work is to establish the mechanisms of radiation-induced defect formation processes in the steatite ceramics SK-1 under у -radiation with the 6()Co source and the reactor n-y radiation. Methods of research: TL, GL, X-ray luminescence and photo-luminescence, EPR, X-ray structure and activation analysis. The results obtained and their novelty: In the work the nature of radiation defects is identified and mechanism of Mn2‘ luminescence is proposed. For the first time by using the complex method the processes of radiation-induced defects formation were studied in steatite ceramics SK-1. It was demonstrated that the radiation defects induced in SK-1 ceramics were caused by sub-threshold mechanism and mainly took place at the interface of crystal and glassy phases. Ions excitation, emission and quenching of recombination luminescence arc verified. It is established that the degradation of optical properties of SK-1 ceramics at high temperature annealing (Tann >850 °C) is caused by the phase transitions in crystal phase and partial crystallization of glassy phase. In the steatite ceramics SK-1 under the reactor irradiation new structure defects, like nonbridging oxygen hole centers (NBOHC) and different types of V- centers arc formed as compared to the y-irradiated reference sample. Practical value: The obtained results significantly expand the variety of peculiarities in mechanisms of radiation-induced processes in complex oxide compounds which arc the ceramics insulators with complex phase-mineralogical composition. Degree of embed and economic effectivity: The results can be implemented in the atomic energy, radiation physics and other fields of science and technology. Field of application: physics of condensed state, atomic energy, radiation physics, material sciences and high-energy physics.