The irradiation behavior of 2M, 3O and 4M polytypes zirconolite solid solutions under α particles

Subjects: Physics >> Interdisciplinary Physics and Related Areas of Science and Technology Subjects: Materials Science >> Ceramics submitted time 2024-03-20

Shiyin Ji Xiuhua ji Yanhao Song Yi Ding Changzhong Liao Yuhong Li

Abstract： The long-term structural stability of high-level radioactive wastes was the key for deep geological disposal under irradiation. In this work, 500 keV He²⁺ ion beams irradiation of zirconolite-2M, zirconolite-3O and zirconolite-4M three-type solid solutions were performed to study the structure damage from α decay in long-term deep geological disposal. All samples were synthesized through conventional high-temperature solid-state reaction at 1400℃ sintered twice 48h. The grazing incidence x-ray diffraction (GIXRD), Raman and x-ray photoelectron spectroscopy (XPS) results indicated that zirconlite-2M sample experienced crystalline phase evolution from zirconolite-2M to zirconolite-4M to disorder pyrochlore and amorphous with irradiation dose increased. For zirconolite-3O sample, the phase transformed to perovskite at 5×10¹⁵ ions/cm² dose, and perovskite quickly transformed to disorder pyrochlore at higher dose. Disorder pyrochlore became major crystal structure when dose increased to 1×10¹⁷ ions/cm². Zirconolite-4M remained with disorder pyrochlore or defect fluorite second phase under 1×10¹⁷ ions/cm² irradiation. Summarily, the irradiation damage resistance of zirconolite-2M was similar with zirconolite-3O, and lower than zirconolite-4M.
 

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