JRP CALL information
Supported By

European Commission

Short description of the work
We have performed X-Ray Absoprtion Near Edge Structure (XANES) Studies on the sodium uranates Na3UO4, Na4UO5 and Na2U2O7 at the Rossendorf Beamline (ROBL, ESRF, Grenoble) under the Talisman framework. We have established the local structure and charge distribution of the uranium cation in those compounds. Na4UO5 and Na2U2O7 present uranium in the oxidation state (VI). In the case of the Na3UO4 compound however, XANES spectra have revealed uranium (VI) and not uranium (V) as expected. This has led us to revisit the compound’s structure and chemical composition, namely Na3.2U0.8O4, by incorporation of 20% excess sodium on the uranium site. Those results have direct consequences from thermodynamics’ perspectives for the fuel-sodium interaction.

Main visitor contact data
Name: Anna Smith
Organisation: Institute for Transuranium Elements

JRP Identification
JRP nr: TALI-C01-02
JRP title: XANES studies of the sodium uranates Na3UO4, Na4UO5 and Na2U2O7
JRP scope: Scope 3: Actinide materials

Visited Associated Pooled Facility
Visited APF during the stay: HZDR - ROBL
Name of the APF Contact Person: Andreas Scheinost

Other APF and organisation involved in the JRP
Other organisations involved: University of Cambridge, Department of Materials Science and Metallurgy
Other APF involved in the project: HZDR - ROBL

Description of the work done at the associated pooled facility
Start date of the stay: 9/25/2013
End date of the stay: 9/27/2013
Quantity of access: 6
Access Unit: Shifts

Other APF visitors of the JRP during the stay
Visitor 2: Damien Prieur (ITU)
Visitor 3: Philippe Raison (ITU)
Visitor 4:
Visitor 5: