Dose rate and temperature effects in radiation disorder creation in SrTiO3

An important aspect of assessing the physical and chemical stability of SrTiO3 phase under radiation is to evaluate the disorder caused by α-decays in the actinide loaded nuclear waste form during the repository time. Indeed, radiation can affect considerably the chemical durability of the solid waste forms, especially for α-emitter immobilisation. It is already known that amorphization in SrTiO3 can be described at room temperature, by the cascade-overlap model with an additional term representing the initial disorder creation. In the present work, it is shown by using Pb-ion beam to simulate the α-recoil nuclei for creating the disorder that Pb-dose rate and sample temperature during irradiation are two important factors that affect SrTiO3 susceptibility to proceed toward amorphization