Transformation and clustering of defects induced by electron irradiation in barium hollandite ceramics for radioactive cesium storage: Electron paramagnetic resonance study

摘要: Barium hollandite-type ceramics have been envisaged for the immobilization of radioactive cesium. To evaluate their stability under irradiation, a hollandite ceramic composition Ba1.16Al2.32Ti5.68O16 was irradiated with electrons at temperature close to room simulate effect β- and γ-decays Ti3+ O2- paramagnetic defects induced by electron irradiation [V. Aubin-Chevaldonnet et al., J. Phys.: Condens. Matter 18, 4007 (2006)] were detected resonance. As in bulk waste form could reach 300 °C beginning storage, thermal these also studied. Isothermal annealing treatments isochronal between 50 °C 800 °C show that (E1 E2 centers) O2− (H do not recombine. Instead, they partially transform during annealing, respectively, into titanyl TiO+ centers (E3 grain s...