Hot isostatic pressed pyrochlore glass‐ceramics: Revealing structure insides at the reaction interface

Abstract

As potential waste forms for immobilizing actinide-rich radioactive wastes, Eu 2 Ti 2 O 7 (Eu as a surrogate for minor actinides) pyrochlore glass-ceramics were fabricated via hot isostatic pressing (HIPing) at 1200°C. The structure and microstructure at the reaction interface between the glass-ceramic waste form and the stainless steel (SS) canister under HIPing conditions were carefully investigated with scanning electron microscopy (SEM), transmission electron microscopy (TEM), and synchrotron single crystal X-ray diffraction (SC-XRD). The interactions at the reaction interface led to

Uranium oxide hydrate frameworks with Er(iii) or Y(iii) ions: revealing structural insights leading to the low symmetry

“…1,2 One issue clearly identified with these fuel systems is the need for the safe management and disposal of the spent nuclear fuel (SNF) once removed from the nuclear reactor, in order to isolate these highly radioactive materials from the general public. 3,4 With a variety of options available, changing from country to country, one of the most widely accepted approaches is the disposal of SNF in stable underground geological repositories, wherein the SNF is essentially safely isolated from the outside world. 2 To ensure this isolated SNF, most commonly present as uranium oxide (UO 2 ), is safe to store within these repositories for the long-term, studies into the behavior of these materials in these geological environments are critical.…”