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Different cerium valence transitions observed by hydrogenation of the ternary germanides CeRhGe and CeIrGe - structure, physical properties and chemical bonding

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.authorGAUDIN, Etienne
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorAL ALAM, Adel F.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMATAR, Samir F.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierCentre de Ressources en Microscopie Electronique et Microanalyse
dc.contributor.authorWEILL, François
hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorHEYING, Birgit
hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorPÖTTGEN, Rainer
dc.date.issued2008
dc.identifier.issn0932-0776
dc.description.abstractEnThe ternary germanides CeRhGe and CeIrGe which crystallize in the orthorhombic TiNiSi-type structure, absorb hydrogen at 523 K. X-Ray powder diffraction and transmission electron microscopy indicate that the hydrides CeRhGeH1.8 and CeIrGeH1.8 adopt the hexagonal ZrBeSi-type structure. Magnetization, electrical resistivity and thermoelectric power measurements reveal that these hydrides are intermediate-valence compounds. An unusual transition from antiferromagnetic to spin fluctuation behavior occurs upon hydrogenation of CeRhGe, while on the contrary, CeIrGeH1.8 presents a Kondo temperature of 285 K smaller than that observed for CeIrGe (610 K). In order to explain these opposite valence transitions, the electronic structures of the hydrides have been selfconsistently calculated within the local spin density functional theory (LSDF). The structures are compared to those reported previously by us for CeRhGe and CeIrGe.
dc.language.isoen
dc.publisherVerlag der Zeitschrift Fuer Naturforschung
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/
dc.subject.enHydrogenation
dc.subject.enStructural transition
dc.subject.enIntermediate-valence compounds
dc.subject.enElectronic structure calculation
dc.title.enDifferent cerium valence transitions observed by hydrogenation of the ternary germanides CeRhGe and CeIrGe - structure, physical properties and chemical bonding
dc.typeArticle de revue
dc.identifier.doi10.1515/znb-2008-0615
dc.subject.halChimie/Matériaux
bordeaux.journalZeitschrift fur Naturforschung B
bordeaux.page685-694
bordeaux.volume63
bordeaux.issue6
bordeaux.peerReviewedoui
hal.identifierhal-00283172
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00283172v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Zeitschrift%20fur%20Naturforschung%20B&rft.date=2008&rft.volume=63&rft.issue=6&rft.spage=685-694&rft.epage=685-694&rft.eissn=0932-0776&rft.issn=0932-0776&rft.au=CHEVALIER,%20Bernard&GAUDIN,%20Etienne&AL%20ALAM,%20Adel%20F.&MATAR,%20Samir%20F.&WEILL,%20Fran%C3%A7ois&rft.genre=article


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