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Rare-earth-rich magnesium compounds RE<sub>23</sub>Rh<sub>7</sub>Mg<sub>4</sub> (RE = La, Ce, Pr, Nd, Sm, Gd) with tetrahedral Mg4 clusters

hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorLINSINGER, Stefan
hal.structure.identifierInstitut für Anorganische und Analytische Chemie
hal.structure.identifierLaboratoire de Cristallographie
dc.contributor.authorTUNCEL, Selcan
hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorHERMES, Wilfried
dc.contributor.authorEUL, Matthias
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.authorPÖTTGEN, Rainer
dc.date.issued2009
dc.identifier.issn0044-2313
dc.description.abstractEnThe rare earth-rich compounds <i>RE</i><sub>23</sub>Rh<sub>7</sub>Mg<sub>4</sub> (<i>RE</i> = La, Ce, Pr, Nd, Sm, Gd) were prepared by induction-melting the elements in sealed tantalum tubes. The new compounds were characterized by X-ray powder diffraction. They crystallize with the hexagonal Pr<sub>23</sub>Ir<sub>7</sub>Mg<sub>4</sub> type structure, space group <i>P</i>6<sub>3</sub><i>mc</i>. The structures of La<sub>23</sub>Rh<sub>7</sub>Mg<sub>4</sub> (<i>a</i> = 1019.1(1), <i>c</i> = 2303.7(4) pm, wR2 = 0.0827, 1979 F<sup>2</sup> values, 69 variables), Nd<sub>23</sub>Rh<sub>7</sub>Mg<sub>4</sub> (<i>a</i> = 995.4(2), <i>c</i> = 2242.3(5) pm, wR2 = 0.0592, 2555 F<sup>2</sup> values, 74 variables) and Gd<sub>23</sub>Rh<sub>6.86(5)</sub>Mg<sub>4</sub> (<i>a</i> = 980.5(2), <i>c</i> = 2205.9(5) pm, wR2 = 0.0390, 2083 F<sup>2</sup> values, 71 variables) were refined from single crystal X-ray diffractometer data. The three crystallographically different rhodium atoms have trigonal prismatic rare earth coordination with short <i>RE</i>-Rh distances (283-300 pm in Nd<sub>23</sub>Rh<sub>7</sub>Mg<sub>4</sub>). The prisms are condensed via common edges, leading to a rigid three-dimensional network in which isolated Mg<sub>4</sub> tetrahedra (312-317 pm Mg-Mg in Nd<sub>23</sub>Rh<sub>7</sub>Mg<sub>4</sub>) are embedded. Temperature dependent magnetic susceptibility data of Ce<sub>23</sub>Rh<sub>7</sub>Mg<sub>4</sub> indicate Curie-Weiss behavior with an experimental magnetic moment of 2.52(1) <sub>B</sub>/Ce atom, indicative for stable trivalent cerium. Antiferromagnetic ordering is evident at 2.9 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.enRare-earth-rich magnesium compounds RE<sub>23</sub>Rh<sub>7</sub>Mg<sub>4</sub> (RE = La, Ce, Pr, Nd, Sm, Gd) with tetrahedral Mg4 clusters
dc.typeArticle de revue
dc.identifier.doi10.1002/zaac.200800361
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie
bordeaux.page282-286
bordeaux.volume635
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-00362485
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00362485v1
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