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RESEARCH PRODUCT

Ion diffusion-controlled thermally stimulated processes in x-ray irradiated halide crystals

I. TaleP. KulisValters ZirapsV. Graveris

subject

Nuclear and High Energy PhysicsRadiationAnnealing (metallurgy)ChemistryAnalytical chemistryHalideMineralogyIonic bondingCondensed Matter PhysicsCrystallographic defectSpace chargeIonIonic conductivityGeneral Materials ScienceIrradiation

description

The ionic and ion diffusion-controlled thermally stimulated relaxation (TSR) processes in CaF2, BaF2, LiBaF3 and KBr crystals were investigated above 290 K by means of the ionic conductivity, ionic thermally stimulated depolarisation current (TSDC) and thermal bleaching techniques. Under a DC field the halide crystals store large ionic space charge. We were able to detect in CaF2, BaF2, LiBaF3 and KBr in the extrinsic ionic conductivity region a series of the ionic defect (the interstitial anion and/or anion vacancies - in fluorides; the cation vacancies - in KBr) release stages: 3-6 wide and overlapping ionic TSDC peaks. The correlated data of the ionic TSDC and the F band thermal show that above 290 K the TSR processes are initiated and controlled by the ionic defect thermal detrapping, migration and interaction with the localised electronic and ionic charges and colour centres. The ion diffusion-controlled TSR processes take place in the above halide crystals.

yearjournalcountryeditionlanguage
2003-08-01Radiation Effects and Defects in Solids
https://doi.org/10.1080/10420150310001595319