Conveners
Solid State Chemistry and Physics of the Actinides
- Andreas Scheinost (HZDR Institute of Resource Ecology)
Solid State Chemistry and Physics of the Actinides
- Andreas Scheinost (HZDR Institute of Resource Ecology)
Solid State Chemistry and Physics of the Actinides
- David Shuh (LBNL)
C. H. Booth
(LBNL)
20/05/2014, 13:45
Solid State Chemistry and Physics of the Actinides
Oral
Although actinide (An) L3-edge x-ray absorption near-edge structure
(XANES) spectroscopy has been very effective in determining An oxidation states in insulating, ionically-bonded materials, such as in certain coordination compounds and mineral systems, the technique fails in systems featuring more delocalized 5f orbitals, especially in metals. Recently, actinide L3-edge resonant x-ray...
Dr
JG Tobin
(Lawrence Livermore National Lab)
20/05/2014, 14:20
Solid State Chemistry and Physics of the Actinides
Oral
Recently, X-ray absorption spectroscopy (XAS) and related derivative measurements have been used to demonstrate the Pu 5f states are strongly relativistic and have a 5f occupation number near 5. [1] Owing to the success in this regime, it has been argued that the XAS measurements should be a powerful tool to probe 5f occupation variation, both as a function of elemental nature (actinide atomic...
Claude Degueldre
(Paul Scherrer Institut)
20/05/2014, 14:55
Solid State Chemistry and Physics of the Actinides
Oral
Oxide fuels (UOx, MOx) are currently used in the nuclear reactors. The study of the actinides atomic environment in homogeneous non-irradiated/irradiated fuel samples was performed employing x-ray fluorescence (XRF) and x-ray absorption fine structure (XAFS) spectroscopy. This investigation is important from a safety view because the actinides can undergo various redox states going from III to...
Marie Caisso
(CEA Marcoule DEN/MAR/DTEC/SDTC/LEMA)
20/05/2014, 15:50
Solid State Chemistry and Physics of the Actinides
Oral
U1-xAmxO2±δ compounds (known as AmBB: americium-bearing blankets) are considered promising materials for americium transmutation in fast neutron reactors.1 The fabrication of these mixed-oxide pellets generally follows a powder metallurgy route that generates significant amounts of highly contaminant fine particles. Dustless processes which can avoid the dispersion of such fine powder in the...
Mr
Florent Lebreton
(CEA, DEN, DTEC/SDTC/LEMA – 30207 Bagnols-sur-Cèze, France)
20/05/2014, 16:15
Solid State Chemistry and Physics of the Actinides
Oral
Mixed uranium-americium oxides are regarded as promising compounds for transmutation in order to reduce americium contribution to radiotoxicity and heat load of ultimate nuclear waste [1]. These materials are thus currently studied, not only in terms of fabrication processes [2–5] or during experimental irradiations [3,6,7] but also through more fundamental research to understand their...
Dr
RENE BES
(Synchrotron SOLEIL, MARS beamline & CEA DEN/DEC/SESC/LLCC)
20/05/2014, 16:40
Solid State Chemistry and Physics of the Actinides
Oral
One of the most challenging research in nuclear energy concerns nuclear fuel and its behavior under irradiation during both normal and off-normal conditions in nuclear power plants. In each case, nuclear fuel behavior and its interaction with cladding materials strongly depend on the chemistry of fission products and actinides during corresponding process. In particular, speciation data are...
Dr
Sergei Butorin
(Department of Physics and Astronomy, Uppsala University)
21/05/2014, 08:40
Solid State Chemistry and Physics of the Actinides
Oral
Data obtained in the tender and soft x-ray ranges for the Th, U, Np and Pu systems are presented and discussed. The use of the so-called Hämäläinen scan at the actinide 3d edges by monitoring the 4f-to-3d x-ray emission transition drastically improves the energy resolution compared to conventional XANES and reveals multiple structures never seen before in contrast to a single line in...
Dr
Kristina Kvashnina
(European Synchrotron Radiation Facility)
21/05/2014, 09:15
Solid State Chemistry and Physics of the Actinides
Oral
This contribution will provide a brief overview of recent progress in X-ray spectroscopy of actinides in the hard and tender X-ray range. We will focus on the high-energy-resolution X-ray fluorescence detected (HERFD) absorption spectroscopy and resonant inelastic X-ray scattering (RIXS) at the U L3 and M4,5 edges of different uranium systems. In connection with latest results, the...
