Ionic charge transport, thermoactivated delocalization and interaction with radiation-induced defects in LiBaF3 crystals

The ionic and ion-diffusion controlled thermally stimulated relaxation (TSR ) processes in CaF2, BaF2 and LiBaF3 crystals have been investigated at 290 -650 K by means of the ionic conductivity, ionic thermally stimulated depol arization current (TSDC) and X-ray induced optical absorption spectra TS bl eaching (TSB) techniques. In the region of the extrinsic ionic conductivity a number of the ionic TSDC peaks (anion vacancy and interstitial detrappin g) and correlated TSB stages have been detected for the first time. The TSR and TSB kinetics above RT in fluoride crystals (X-ray irradiated at RT) ar e initiated and controlled by the anion interaction with the radiation-indu ced defects, i.e., the anion-diffusion controlled processes take place.