Effect of storage temperature of self-irradiation damage of 238Pu-substituted zirconolite

238Pu-substituted cubic zirconolite (CaPuTi2O7) was stored at ambient temperature, 575 K and 875 K until alpha decay doses of 2.4 to 3.6 x 1025/m3 had been accumulated. The ambient temperature material swelled to a saturation value of 5.5 vol%, and the originally crystalline structure was transformed to one with an amorphous matrix and small domains that had retained their crystallinity. At 575 K lesser amounts of swelling (4.1 vol%) and transformation were observed, reflecting concurrent partial recovery. The material held at 875 K remained crystalline, swelled only 0.4 vol%, and exhibited formation of isolated defect clusters