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

IF 2.4 3区物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION

Journal of Synchrotron Radiation Pub Date : 2022-03-01 Epub Date: 2022-01-27 DOI:10.1107/S160057752101300X

Anna Romanchuk, Alexander Trigub, Tatiana Plakhova, Anastasiia Kuzenkova, Roman Svetogorov, Kristina Kvashnina, Stepan Kalmykov

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引用次数: 0

Abstract

Extended X-ray absorption fine structure (EXAFS) is a comprehensive and usable method for characterizing the structures of various materials, including radioactive and nuclear materials. Unceasing discussions about the interpretation of EXAFS results for actinide nanoparticles (NPs) or colloids were still present during the last decade. In this study, new experimental data for PuO₂ and CeO₂ NPs with different average sizes were compared with published data on AnO₂ NPs that highlight the best fit and interpretation of the structural data. In terms of the structure, PuO₂, CeO₂, ThO₂, and UO₂ NPs exhibit similar behaviors. Only ThO₂ NPs have a more disordered and even partly amorphous structure, which results in EXAFS characteristics. The proposed new core-shell model for NPs with calculated effective coordination number perfectly fits the results of the variations in a metal-metal shell with a decrease in NP size.

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EXAFS的有效配位数：镧系和锕系二氧化物的一般方法

尺寸范围为2的PuO2和CeO2纳米颗粒的新实验EXAFS结果 nm与其它镧系元素和锕系元素二氧化物的已公布数据进行比较。为了适应EXAFS的变化，提出了一个概念核壳模型，并计算了有效配位数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Synchrotron Radiation 物理-光学

CiteScore

5.10

自引率

12.00%

发文量

289

审稿时长

4-8 weeks

期刊介绍： Synchrotron radiation research is rapidly expanding with many new sources of radiation being created globally. Synchrotron radiation plays a leading role in pure science and in emerging technologies. The Journal of Synchrotron Radiation provides comprehensive coverage of the entire field of synchrotron radiation and free-electron laser research including instrumentation, theory, computing and scientific applications in areas such as biology, nanoscience and materials science. Rapid publication ensures an up-to-date information resource for scientists and engineers in the field.