MAHON, Tadhg; GAUDIN, Etienne; VILLESUZANNE, Antoine; DECOURT, Rodolphe; BOBET, Jean-Louis; ISNARD, Olivier; CHEVALIER, Bernard; TENCÉ, Sophie

doi:10.1021/acs.inorgchem.8b02247

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

MAHON, Tadhg
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GAUDIN, Etienne
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

VILLESUZANNE, Antoine
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

Langue

Article de revue

Ce document a été publié dans

Inorganic Chemistry. 2018, vol. 57, n° 22, p. 14230-14239

American Chemical Society

Résumé en anglais

Intermetallic phases have been investigated with respect to their ability to accept small atoms in interstitial sites without changing the host structure. Among those, the intermetallic compounds crystallizing in the tetragonal CeScSi-type structure are able to absorb hydrogen atoms. These compounds are of particular interest because they can show electride-like character and, therefore, can be exploited as new catalysts. Here we report the case of GdScGe which uptakes hydrogen at 623 K and under a H2 gas pressure between 0.5 and 4 MPa. The formation of the hydride GdScGeH, with H atoms entering into the [Gd4] tetrahedra, preserves the host structure but induces an anisotropic volume expansion with a strong increase of the c-parameter and a slight decrease of the a-parameter. Interestingly, we show for the first time for this family of materials that hydrogen insertion reduces the dimensionality of the magnetic and transport properties from 3D to quasi-2D which results in a vanishing of the ferromagnetic order (TC = 350 K for GdScGe) and a change of the metallic conduction behavior to a nonmetallic one. As evidenced by density functional theory calculations, such drastic effects are accounted for through the Gd–H chemical bonding effect and the oxidizing effect of H whereas the volume expansion plays only a minor role.< Réduire

Métadonnées

Licence d’utilisation du document

Hydrogen insertion in the intermetallic GdScGe: a drastic reduction of the dimensionality of the magnetic and transport properties

Langue

Ce document a été publié dans

Résumé en anglais

DOI

Origine

Unités de recherche