Contribution of Mössbauer spectrometry to structural characterizations of iron-based fluorinated materials: Application to pyrochlore (NH4)CuFeF6 and a new derived hydrate - Le Mans Université Accéder directement au contenu
Article Dans Une Revue Journal of Materials Research Année : 2023

Contribution of Mössbauer spectrometry to structural characterizations of iron-based fluorinated materials: Application to pyrochlore (NH4)CuFeF6 and a new derived hydrate

Résumé

This paper brings together the latest studies on iron-based fluorides, anhydrous, hydrates, or hybrids, particularly composed of HTB sheets, with the help of 57Fe Mössbauer spectrometry to accurately describe the chemical compositions and to highlight the anionic and/or cationic orders or disorders. As an illustration, a new ammonium hexafluoride with the formulation (NH4)Cu2+Fe3+F6 is synthesized by mechanical milling. Structural analysis by powder XRD made it possible to establish the disordered cubic pyrochlore structure. Because of its local probe behavior, the hyperfine structure observed by Mössbauer spectrometry not only specifies the oxidation state of Fe species but also confirms the cationic disorder and thus the magnetic frustration with a paramagnetic doublet at 77 K for Fe3+. The hydration of (NH4)CuFeF6 leads to a new structure corresponding to the hydrate (NH4)CuFeF6(H2O)4.H2O through self-crystallization under ambient air atmosphere. Such a process, giving millimeter size single crystals, is rarely encountered.

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Chimie
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Dates et versions

hal-04095070 , version 1 (11-05-2023)

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Kévin Lemoine, Alexandre Terry, Annie Hémon-Ribaud, Jean-Marc Grenèche, Marc Leblanc, et al.. Contribution of Mössbauer spectrometry to structural characterizations of iron-based fluorinated materials: Application to pyrochlore (NH4)CuFeF6 and a new derived hydrate. Journal of Materials Research, 2023, 38 (4), pp.1138-1148. ⟨10.1557/s43578-022-00836-3⟩. ⟨hal-04095070⟩
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