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The application of HEXS and HERFD XANES for accurate structural characterisation of actinide nanomaterials: application to ThO2статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Amidani Lucia, Vaughan Gavin B.M., Plakhova Tatiana V., Romanchuk Anna Yu, Gerber Evgeny, Svetogorov Roman, Weiss Stephan, Joly Yves, Kalmykov Stephan N., Kvashnina Kristina O.
- Журнал: Chemistry - A European Journal
- Том: 26
- Год издания: 2021
- Издательство: John Wiley & Sons Ltd.
- Местоположение издательства: United Kingdom
- DOI: 10.1002/chem.202003360
- Аннотация: Structural characterization of actinide nanoparticles (NPs) is of primary importance and hard to achieve, especially for non‐homogeneous samples with NPs below 3 nm. By combining High Energy X‐ray Scattering (HEXS) and High‐Energy‐Resolution Fluorescence Detected X‐ray Near‐Edge Structure (HERFD XANES), we characterized for the first time both short‐ and medium‐range order of ThO2 NPs obtained by chemical precipitation. With this methodology, a novel insight into the structure of NPs at different steps of their formation process is achieved. The Pair Distribution Function (PDF) reveals a high concentration of ThO2 small units similar to Th hexamer clusters mixed with 1 nm ThO2 NPs in the initial steps of formation. Drying the precipitates at ⁓150 °C promotes recrystallization of the smallest units into more thermodynamically stable ThO2 NPs. HERFD XANES at Th M4 edge, a direct probe of the f states, shows variations that we correlate to the break of the local symmetry around Th atoms, which most likely concerns surface atoms. Together, HEXS and HERFD are a powerful methodology to investigate actinide NPs and their formation mechanism.
- Добавил в систему: Плахова Татьяна Вячеславовна