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Institute of Energy and Climate Research

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Solid State Chemistry

The actinide elements are of particular concern due to their long half-life and their high radiotoxicity. Knowledge of the stability and the reactivity of actinide compounds under conditions relevant for a waste repository system require a deep understanding of their chemistry in different conditions, including solid state. From a solid state chemistry perspective, the actinides with their characteristic 5f electrons, exhibit an extremely complex redox and binding behaviour in general and in the solid state in particular. The relationship between the structure of actinide-based materials and their properties is one of the most important questions of fundamental actinide science.

Our research is oriented on understanding fundamental composition and structural properties of actinide in solid state oxo-phases. The research includes understanding oxo-phases formation, their structures, spectroscopic, thermodynamic and materials properties. The priority in this research is given to mineral-like and naturally occurring materials. These phases are mostly based on oxo-anions, simple or complex oxides. State-of-the-art techniques are used for structure characterization and thermodynamic characterization of synthetized phases. The work is mostly focused on uranium (U) and thorium (Th) but some experiments are carried out with transuranic elements such as neptunium (Np) and plutonium (Pu). The formation of materials is studied under normal and extreme conditions (high-temperature/high-pressure). The potential behaviour of americium (Am3+) and curium (Cm3+) under extreme conditions is studied with using lanthanides (Ln3+) as surrogates.

Additional Information

Contact

Prof. Dr. Evgeny Alekseev

Tel.: +49 2461 61-6606
Fax: +49 2461 61-2450

e.alekseev@fz-juelich.de


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