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Ternary magnesium compounds RE23Ni7Mg4 (RE = La, Ce, Pr, Nd, Sm) with Pr23Ir7Mg4 type structure

hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorTUNCEL, Selcan
hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorHERMES, Wilfried
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHEVALIER, Bernard
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.issued2008
dc.identifier.issn0044-2313
dc.description.abstractEnNew rare earth-rich compounds RE23Ni7Mg4 (RE = La, Ce, Pr, Nd, Sm) were synthesized from the elements in sealed tantalum tubes in a water-cooled sample chamber of an induction furnace. The samples were characterized via X-ray powder diffraction. The RE23Ni7Mg4 compounds crystallize with the hexagonal Pr23Ir7Mg4 type structure, space group P63mc. The structures of La23Ni7Mg4 (a = 1013.7(3), c = 2295.2(8) pm, wR2 = 0.0371, 2283 F2 values, 75 variables) and Pr23Ni7Mg4 (a = 992.8(3), c = 2243.0(5) pm, wR2 = 0.0634, 2462 F2 values, 74 variables) were refined from single crystal X-ray diffractometer data. Striking structural motifs are nickel centered trigonal prisms formed by the rare earth elements and isolated Mg4 tetrahedra (319 pm as Mg-Mg distance in La23Ni7Mg4). The trigonal RE6Ni prisms exhibit short RE-Ni distances (287-306 pm in La23Ni7Mg4). The prisms are condensed via common edges, leading to a rigid three-dimensional network in which the Mg4 tetrahedra are embedded. Temperature dependent magnetic susceptibility data of Ce23Ni7Mg4 indicate Curie-Weiss behavior with an experimental magnetic moment of 2.54 B/Ce atom, indicative for stable trivalent cerium. No magnetic ordering is evident down to 3 K.
dc.language.isoen
dc.publisherWiley-VCH Verlag
dc.subject.enRare earth compounds
dc.subject.enMagnesium
dc.subject.enMagnetism
dc.subject.enCrystal chemistry
dc.title.enTernary magnesium compounds RE23Ni7Mg4 (RE = La, Ce, Pr, Nd, Sm) with Pr23Ir7Mg4 type structure
dc.typeArticle de revue
dc.identifier.doi10.1002/zaac.200800071
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie
bordeaux.page2140-2144
bordeaux.volume634
bordeaux.issue12-13
bordeaux.peerReviewedoui
hal.identifierhal-00331169
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00331169v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Inorganic%20and%20General%20Chemistry%20/%20Zeitschrift%20f%C3%BCr%20anorganische%20und%20allgemeine%20Chemie&rft.date=2008&rft.volume=634&rft.issue=12-13&rft.spage=2140-2144&rft.epage=2140-2144&rft.eissn=0044-2313&rft.issn=0044-2313&rft.au=TUNCEL,%20Selcan&HERMES,%20Wilfried&CHEVALIER,%20Bernard&RODEWALD,%20Ute%20Ch.&P%C3%96TTGEN,%20Rainer&rft.genre=article


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