HANSEN, Mads; VANEY, Jean-Baptiste; DE RANGO, Patricia; SALAUN, Mathieu; TENCÉ, Sophie; NASSIF, V.; TOULEMONDE, Pierre

doi:10.1016/j.jallcom.2023.169281

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HANSEN, Mads
Matériaux, Rayonnements, Structure [NEEL - MRS]

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

DE RANGO, Patricia
Matériaux, Rayonnements, Structure [NEEL - MRS]

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Article de revue

Ce document a été publié dans

Journal of Alloys and Compounds. 2023, vol. 945, p. 169281

Elsevier

Résumé en anglais

In this study we investigate the topotactical deuteration of LaFeSi using in-situ neutron powder diffraction, yielding superconducting LaFeSi(H,D). The structural changes are linked to the thermodynamic nature of the chemical process, investigated using thermogravimetric analysis, differential thermal analysis, and mass spectroscopy. Pressure-composition-isotherm measurements further show a remarkably low equilibrium pressure. The reaction is found to be binary with two separate phases LaFeSi and LaFeSiD coexisting during the reaction. The reaction enthalpy, determined using differential thermal analysis is found to be ΔH = − 54.5 kJ/mol. Furthermore the anisotropy of the thermal expansion is observed to change significantly as αc∕αa changes from 6.6 to 1.2. All the LaFeSi(H,D) obtained samples were found to be superconducting with Tc ∼ 10 K, i.e. the value corresponding to stoichiometric composition. We conclude that this gas-solid process does not produce a solid solution with a tunable x(H), LaFeSiHx, where Tc would be continuously changed.< Réduire

Mots clés en anglais

Iron-based superconductors

Intermetallics

Hydrogenation

In-situneutron powder diffraction

Crystallography

DOI

http://dx.doi.org/10.1016/j.jallcom.2023.169281

Project ANR

Laboratory of Alliances on Nanosciences - Energy for the Future - ANR-10-LABX-0051
Novel As/Se-free Iron-based Superconductors - ANR-18-CE30-0018

Origine

Importé de hal

Unités de recherche

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