Effective coordination numbers from EXAFS: general approaches for lanthanide and actinide dioxides

Авторы: Romanchuk Anna, Trigub Alexander, Plakhova Tatiana, Kuzenkova Anastasiia, Svetogorov Roman, Kvashnina Kristina, Kalmykov Stepan
Журнал: Journal of Synchrotron Radiation
Том: 29
Номер: 2
Год издания: 2022
Издательство: Blackwell Publishing Inc.
Местоположение издательства: United Kingdom
DOI: 10.1107/s160057752101300x
Аннотация: Extended X-ray absorption fine structure (EXAFS) is a comprehensive andusable method for characterizing the structures of various materials,including radioactive and nuclear materials. Unceasing discussions about theinterpretation of EXAFS results for actinide nanoparticles (NPs) or colloidswere still present during the last decade. In this study, new experimentaldata for PuO2 and CeO2 NPs with different average sizes were compared withpublished data on AnO2 NPs that highlight the best fit and interpretation ofthe structural data. In terms of the structure, PuO2, CeO2, ThO2, and UO2NPs exhibit similar behaviors. Only ThO2 NPs have a more disordered andeven partly amorphous structure, which results in EXAFS characteristics. Theproposed new core-shell model for NPs with calculated effective coordinationnumber perfectly fits the results of the variations in a metal–metal shell with adecrease in NP size.
Добавил в систему: Романчук Анна Юрьевна

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