Modeling of Irradiation-Induced Amorphization in a Titanate Ceramic

摘要

Calculations have been carried out to model the alpha decay-induced conversion of a titanate ceramic (CaPuTi sub 2 O sub 7 ) from the crystalline state to an amorphous condition. Experimental results have shown that the disordered state varies with irradiation temperature and extent of redamage, and so special consideration is given to those factors. Results of these calculations are applied to the analysis of dimensional changes during irradiation at various temperatures and release of stored energy on recovery to the crystalline state. Modeling results appear to show that it is possible to convert to the amorphous state under irradiation by two different processes. Modeling is also employed to extend experimental results on swelling from the present data base to a high damage rate characteristic of ion implantation and the low rates typical of nuclear waste storage and self-damage of natural mineral analogues. 15 refs., 5 figs.; 1 tab. (ERA citation 12:047901)