Abstract
Pyrochlore (Gd 2Ti 2O 7) and zirconolite (CaZrTi 2O 7) were irradiated with 1.5 MeV Xe +, 1.0 MeV Kr +, and 0.6 MeV Ar + at temperatures from 20 to 1073 K. Critical amorphization dose increased with increasing temperature. Heavier ion irradiation increased the critical temperature. The extrapolated critical temperatures for amorphization were calculated as: 1300, 1100 and 950 K for pyrochlore irradiated with 1.5 MeV Xe +, 1.0 MeV Kr + and 0.6 MeV Ar +, respectively; 710 and 654 K for zirconolite irradiated with 1.5 MeV Xe + and 1.0 MeV Kr +, respectively. At the early stage of irradiation, pyrochlore transformed to a disordered fluorite structure; monoclinic zirconolite first transformed to partially disordered cubic pyrochlore structure followed by a disordered fluorite structure.
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