[en] Several perovskite-structure oxide compounds, including CaTiO₃, SrTiO₃, BaTiO₃, KNbO₃, and KTaO₃ were irradiated by 800 keV Kr⁺ ions in order to investigate and compare their response to heavy-ion irradiation. The critical amorphization temperature T_c, above which amorphization temperature T_c, above which amorphization could not be induced, was found to increase in the order SrTiO₃ → CaTiO₃ → BaTiO₃ → KNbO₃ → KTaO₃. No single physical parameter explains the observed sequence, although T_c correlates well with the melting temperatures. The well-known temperature-driven phase transformations in these materials did not have a significant effect on the dose required for amorphization. Domain boundaries were observed in the pristine samples; however, after only a low dose, the boundaries became poorly defined and, with increasing dose, eventually disappeared. Dislocation loops were observed to aggregate at the domain boundaries