Solid-State NMR Characterization of Synroc
EMSL Project ID
2021
Abstract
Synroc is a titanate based multiphase ceramic developed for immobilizing high level waste from nuclear fuel reprocessing. The main constituent phases are zirconolite (CaZrTi2O7), perovskite (CaTiO3), hollandite (Ba(Al,Ti)2Ti6O16) and reduced rutile (TiO2). It can also contain nearly all fission products and actinides from high level waste in dilute solid solution. There has already been a large synthetic effort directed at producing the individual components, such that isotopic labels have been incorporated to facilitate NMR analysis. Previous efforts at natural abundance 47/49Ti solid state NMR generate compilcated powder pattern as the gyromagetic ratios of each isotope are very close. In the case of 91Zr the width of the line (due mainly to large quadrupole coupling interactions) has typically prohibited the use of solid state NMR and forced the researchers to turn to NQR methods. However with the advent of high field instrumentation such as the 18.8 T medium bore magnet, there is now the possibility of looking at these metals and extracting information about their environments.
Project Details
Project type
Capability Research
Start Date
2000-11-06
End Date
2001-03-06
Status
Closed
Released Data Link
Team
Principal Investigator