Title: Insight into the Crystalline Structure of ThF4 with the Combined Use of Neutron Diffraction, 19F Magic-Angle Spinning-NMR, and Density Functional Theory Calculations
Authors: MARTEL LAURACAPELLI ELISABODY MONIQUEKLIPFEL MARCOBENES ONDREJMAKSOUD LOUISRAISON PHILIPPESUARD EVISSCHER LUCASBESSADA CATHERINELEGEIN CHRISTOPHECHARPENTIER THIBAULTKOVACS ATTILA
Citation: INORGANIC CHEMISTRY vol. 57 p. 15350 - 15360
Publisher: AMER CHEMICAL SOC
Publication Year: 2018
JRC N°: JRC113223
ISSN: 0020-1669 (online)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC113223
DOI: 10.1021/acs.inorgchem.8b02683
Type: Articles in periodicals and books
Abstract: Because of its sensitivity to the atomic scale environment, solid-state NMR offers new perspectives in terms of structural characterization, especially when applied jointly with first-principles calculations. Particularly, challenging is the study of actinide-based materials because of the electronic complexity of the actinide cations and to the hazards due to their radioactivity. Consequently, very few studies have been published in this subfield. In the present paper, we report a joint experimental−theoretical analysis of thorium tetrafluoride, ThF4, containing a closed-shell actinide (5f0) cation. Its crystalline structure has been revisited in the present work using powder neutron diffraction experiments. The 19F NMR parameters of the seven F crystallographic sites have been modeled using an empirical superposition model, periodic first-principles calculations, and a cluster-based all-electron approach. On the basis of the atomic position optimized structure, a complete and unambiguous assignment of the 19F NMR resonances to the F sites has been obtained.
JRC Directorate:Nuclear Safety and Security

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