Thermal annealing of disorder in Pb-ion irradiated SrTiO_3

RADIOCHAttention was paid to thermal annealing of defects in the SrTiO3 lattice preliminary irradiated by Pb2+ ions which were used to simulate the recoil-nuclei during α-decay events in actinide waste forms. Two different types of defect depending upon Pb2+ irradiation fluence and annealing temperature were characterized with their activation energy and a prefactor related to the fraction recovered per second. Such thermal annealing data are necessary to predict the matrix behaviour under the storage conditions. Additional informations were obtained on the defect structure using Rutherford backscattering spectrometry in channeling condition. The measurement of the de-channeling yield along different axes and planes in the crystal has permitted to analyse partially the isolated defect structure