VANEY, Jean-Baptiste; VIGNOLLE, Baptiste; DEMOURGUES, Alain; GAUDIN, Etienne; DURAND, Etienne; LABRUGÈRE, Christine; BERNARDINI, Fabio; CANO, Andrés; TENCÉ, Sophie

doi:10.1038/s41467-022-29043-8

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VANEY, Jean-Baptiste
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

VIGNOLLE, Baptiste
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DEMOURGUES, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Article de revue

Ce document a été publié dans

Nature Communications. 2022-03-18, vol. 13, p. 1462

Nature Publishing Group

Résumé en anglais

Intermetallics represent an important family of compounds, in which insertion of light elements (H, B, C, N) has been widely explored for decades to synthesize novel phases and promote functional materials such as permanent magnets or magnetocalorics. Fluorine insertion, however, has remained elusive so far since the strong reactivity of this atypical element, the most electronegative one, tends to produce the chemical decomposition of these systems. Here, we introduce a topochemical method to intercalate fluorine atoms into intermetallics, using perfluorocarbon reactant with covalent C-F bonds. We demonstrate the potential of this approach with the synthesis of non-stoichiometric mixed anion (Si-F) LaFeSiF x single-crystals, which are further shown to host FeSi-based superconductivity. Fluorine topochemistry on intermetallics is thus proven to be an effective route to provide functional materials where the coexistence of ionic and metallo-covalent blocks, and their interactions through inductive effects, is at the root of their functional properties.< Réduire

DOI

http://dx.doi.org/10.1038/s41467-022-29043-8

Project ANR

Novel As/Se-free Iron-based Superconductors - ANR-18-CE30-0018

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Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026