Speaker
Lucas Sweet
(Pacific Northwest National Laboratory)
Description
The environmental fate and transport of transuranium elements and the search for alternative f-element separation methods require a better understanding of the speciation of transuranics under oxidizing alkaline conditions, especially in the presence of ubiquitous ligands such as peroxide and carbonate. From our exploration of the Ce and Pu peroxo-carbonate systems several new structures containing the known [(CO3)3M(O2)2Ce(CO3)3]–8 (M = Ce(IV) or Pu(IV)) dimer were found. A simplified synthetic procedure was used to prepare crystalline products of several novel compounds, namely [NH4]8[(CO3)3Ce(O2)2Ce(CO3)3]•6H2O, [C(NH2)3]8[(CO3)3Ce(O2)2Ce(CO3)3] ]•4H2O, Na8[(CO3)3Ce(O2)2Ce(CO3)3]•12H2O and K8[(CO3)3Pu(O2)2Ce(CO3)3]•12H2O. Structural characterization of the aforementioned compounds was performed using single crystal x-ray diffraction. It was observed that the crystal packing of the [(CO3)3M(O2)2Ce(CO3)3]–8 dimeric unit varied significantly depending on the cation incorporated into the structure (e.g., Na+, K+, NH4+ , and C(NH2)3+). Additional characterization of the f-element compounds was performed on single crystals using a high-resolution microscope-based Raman spectrometer.
Primary author
Lucas Sweet
(Pacific Northwest National Laboratory)
Co-authors
Kate Ziegelgruber
(Ohio State University)
Leah Arrigo
(Pacific Northwest National Laboratory)
Shane Peper
(Pacific Northwest National Laboratory)
