Talk (non-conference) (Invited)

FZJ-2022-04694

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Inorganic chemistry of 5f elements in oxo-systems: from normal to extreme conditions.

Alekseev, E. (Corresponding author)FZJ*

2022

Abstract: Actinides show a great diversity in their chemistry due to the complex structure of 5f electron shells and delocalization of 5f-electrones within early actinides family. One of the most remarkable properties of early actinides is a multi-valence accomplished by a great coordination diversity. For example, uranium demonstrates valences from II to VI in solid state, where IV and VI are the most usual and stable. Similar situation is with Np, P and Am. In the talk some recent aspects of early actinides (Th, U, Np and Pu) chemistry in oxo-salt systems under normal and extreme conditions (HP/HT) will be presented. Stabilization of rare U(V) with aliovalent substitution will be discussed. The importance of pressure and temperature on An-bearing phase formation and their structures will be demonstrated on examples of Th and U oxo-borate phases.

Keyword(s): Energy (1st) ; Chemistry (2nd)

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)

Research Program(s):

1. 1232 - Power-based Fuels and Chemicals (POF4-123) (POF4-123)

Appears in the scientific report 2022

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