RadChem 2018

Session

TAN 3

TAN.3

17 May 2018, 13:30

Casino Conference Centre

Conveners

TAN 3

• Igor Izosimov
• Peter Kaden (Helmholtz-Zentrum Dresden - Rossendorf e.V.)

655. Electrochemical Behavior of Plutonium in Nitric Acid and n-Tributyl Phosphate

Philippe Moisy (CEA/DEN/DMRC)

17/05/2018, 13:30

Chemistry of Actinide and Trans-actinide Elements

Verbal

The redox behavior of actinides is particularly complex because these elements have both many degrees of oxidation and many disproportionation reactions. In the case of plutonium, the most common oxidation states in the aqueous phase are +3 to +6. For the +3 and +4 oxidation states the solution ions are in the aquo hydrate form whereas the +5 and +6 oxidation states are in the "yle" form, ie...

465. New Insights into the Chemistry of the An-Se-oxosystem

Mr Eike Langer (Forschungszentrum Jülich GmbH)

17/05/2018, 13:45

Chemistry of Actinide and Trans-actinide Elements

Verbal

Complexity of An chemistry in aqueous oxo-salt systems is dominated by their redox behavior. It’s became even more complex in the systems where oxo-salts are also redox sensitive, for example in Se and I based systems. In order to better understand the chemistry of An in Se based oxo-systems we performed a series of systematic research on reactivity and phase formation of An bearing selenates...

533. Sublattices of actinide atoms in crystal structures

Anton Savchenkov (Samara National Research University)

17/05/2018, 14:00

Chemistry of Actinide and Trans-actinide Elements

Verbal

As known, in classical crystal chemistry special attention is paid to closest sphere packings, which satisfy the Laves’ maximum space filling (MSF) principle. The most important to crystal chemistry closest sphere packings are the face-centered cubic (fcc) and hexagonal close-packed (hcp) ones. In terms of such packings, atoms in crystal structures are treated as hard spheres of constant...

637. Astatine: Halogen or Metal?

Dr Gilles Montavon (SUBATECH)

17/05/2018, 14:15

Chemistry of Actinide and Trans-actinide Elements

Verbal

The halogen family is generally assumed to stop at iodine. Does astatine, element 85, continue the vertical trend of the halogens, does it behave like a metal? Unfortunately, little is known of the basic chemistry of astatine: it is a rare (only short-lived isotopes can be produced) and “invisible” (the amount of produced 211At requires working at ultra-trace concentrations) element. In the...

547. Impact of charge transfer to ligands on magnetism of Uranium compounds

Ladislav Havela (Charles University)

17/05/2018, 14:30

Chemistry of Actinide and Trans-actinide Elements

Verbal

Uranium metal as well as other light actinides are weak Pauli paramagnets, i.e. do not exhibit magnetic moments. The reason is a large overlap of the 5f wave functions centered on nearest U neighbours. The 5f states form consequently a broad 5f band. Increasing the U-U spacing in compounds makes the 5f band narrower and eventually U moments are formed and order (ferro- or antiferromagnetic...

638. Thermodynamic and Structural study of uranyl phosphonate-based ligands as potential uranium decorporation agents

Mr Gaoyang YE (Université Paris-Sud)

17/05/2018, 14:45

Chemistry of Actinide and Trans-actinide Elements

Verbal

Éric Simoni1, Jérome Roques1, Christophe Den Auwer2, Loïc J. Charbonnière3,Pier-Lorenzo Solari4
1Institut de Physique Nucléaire d’Orsay, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, Orsay, France
2Institut de Chimie de Nice, Université Côte d’Azur, CNRS, Nice, France
3IPHC, UMR 7178 CNRS/ Université de Strasbourg, Strasbourg , France
4MARS beamline, Synchrotron SOLEIL, Gif...