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Article Dans Une Revue Advanced Materials Année : 2022

The Third Dimension of Ferroelectric Domain Walls

Résumé

Abstract 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.

Dates et versions

hal-03766643 , version 1 (01-09-2022)

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Erik Roede, Konstantin Shapovalov, Thomas Moran, Aleksander Mosberg, Zewu Yan, et al.. The Third Dimension of Ferroelectric Domain Walls. Advanced Materials, 2022, 34 (36), pp.2202614. ⟨10.1002/adma.202202614⟩. ⟨hal-03766643⟩

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