|About this Abstract
||Materials Science & Technology 2012
||Materials Issues in Nuclear Waste Management in the 21st Century
||Advanced Ceramic Waste Forms for the Immobilisation of Radioactive Wastes
||Neil Hyatt, Martin Stennett, Amy Gandy, Claire Corkhill, Paul Heath, Laura Casey
|On-Site Speaker (Planned)
This presentation will present progress in three areas of research in advanced nuclear ceramic waste forms:
1. The development of a methodology to probe the structure and evolution of the radiation damaged structure of model wasteform materials, combining ex-situ ion beam irradiation of bulk ceramics with X-ray Absorption Spectroscopy to quantify damage induced changes in element speciation.2. The crystal structure of Ce0.975Ti2O5.95 a potential actinide host. The presence of both Ce and O vacancies was confirmed from Rietveld analysis and defect energy calculations. Formation of oxygen vacancies, charge compensated by Ce vacancies, relieves considerable Coulombic repulsion associated with short O-O contacts.3. The novel and rapid synthesis of Pb5(VO4)3I, a potential immobilisation host for iodine radioisotopes, by microwave dielectric heating. Microwave irradiation of a mixture of PbO, PbI2, and V2O5 at a power of 800W (at 2.45 GHz) in an open container lead to the formation of Pb5(VO4)3I 180s.