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Hydrogenation studies on NdScSi and NdScGe

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorTENCÉ, Sophie
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMAHON, Tadgh
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGAUDIN, Etienne
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHEVALIER, Bernard
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBOBET, Jean-Louis
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorFLACAU, Roxana
hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorHEYING, Birgit
hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorRODEWALD, Ute Ch.
hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorPÖTTGEN, Rainer
dc.date.issued2016
dc.identifier.issn0022-4596
dc.description.abstractEnNdScSi and NdScGe were synthesized from the elements via arc-melting and subsequent annealing. Their ordered La2Sb type structures, with space group I4/mmm, were refined from single crystal X-ray diffractometer data: a=428.94(6) and b=1570.5(3) pm, wR2=0.0395, 309 F2 values for NdScSi and a=431.2(1) and c=1581.3(5) pm, wR2=0.1220, 227 F2 values for NdScGe, with 11 variables per refinement.Hydrogen insertion was performed on both Nd-based intermetallics by solid/gas reaction. Hydrogen uptake keeps the pristine compound space group but yields an anisotropic expansion of the unit cell with a large increase of c (≈+7%) and a slight decrease of a (≈−1.7%) parameters. Hydrogen absorption at 350 °C and under 5 bar of H2 pressure shows that the hydride NdScSiH1.48(5) is formed. An in-situ neutron diffraction study during the deuteration of NdScSi reveals for the first time in a CeScSi-type compound, the possibility to fill two interstitial sites with deuterium atoms, leading to the composition NdScSiD1.5 for the deuteride adopting then the La2Fe2Se2O3-type structure.From magnetization measurements, we evidence that hydrogenation strongly reduces the Curie temperature of NdScSi (TC=175 K) and NdScGe (TC=194 K) since NdScSiH1.5 and NdScGeHx undergo a magnetic transition at 4 K and around 2 K, respectively.
dc.language.isoen
dc.publisherElsevier
dc.subject.enSilicides
dc.subject.enGermanides
dc.subject.enCrystal chemistry
dc.subject.enHydrogenation reactions
dc.subject.enNeutron diffraction
dc.subject.enMagnetic properties
dc.title.enHydrogenation studies on NdScSi and NdScGe
dc.typeArticle de revue
dc.identifier.doi10.1016/j.jssc.2016.02.017
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Solid State Chemistry
bordeaux.page168-174
bordeaux.volume242
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-01362245
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01362245v1
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