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The stannides RE2Ni2Sn (RE = Pr, Ho, Er, Tm) - Structural transition from the W2B2Co to Mo2B2Fe type as a function of the rare earth size

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
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHEVALIER, Bernard
dc.date.issued2013
dc.identifier.issn0932-0776
dc.description.abstractEnThe stannides RE2Ni2Sn (RE = Pr, Ho, Er, Tm) were synthesized by arc-melting of the elements and characterized by powder X-ray diffraction. Pr2Ni2Sn crystallizes with the orthorhombic W2B2Co-type structure, Immm, a = 443.8(1), b = 572.1(1), c = 855.1(2) pm, wR2 = 0.0693, 293 F2 values, 13 variables. A structural transition to the tetragonal Mo2B2Fe type occurs for the heavier rare earth elements. The structures of Ho2Ni2Sn (a = 729.26(9), c = 366.66(7) pm, wR2 = 0.0504, 250 F2 values, 12 variables), Er2Ni2Sn (a = 727.2(2), c = 364.3(1) pm, wR2 = 0.0397, 262 F2 values, 12 variables), and Tm2Ni2Sn (a = 725.2(1), c = 362.8(1) pm, wR2 = 0.0545, 258 F2 values, 12 variables) were refined from single-crystal diffractometer data. The switch in structure type is driven by the size of the rare earth element. The [Ni2Sn] substructures are composed of Ni2Sn2 squares and Ni4Sn2 hexagons in Pr2Ni2Sn, and of Ni3Sn2 pentagons in Er2Ni2Sn. The Ni4Sn2 hexagons and Ni3Sn2 pentagons exhibit Ni2 pairs with Ni-Ni distances of 247 pm in Pr2Ni2Sn, and of 250 pm in Er2Ni2Sn.
dc.language.isoen
dc.publisherVerlag der Zeitschrift Fuer Naturforschung
dc.subjectStannides
dc.subjectCrystal Structure
dc.subjectLanthanoid contraction
dc.title.enThe stannides RE2Ni2Sn (RE = Pr, Ho, Er, Tm) - Structural transition from the W2B2Co to Mo2B2Fe type as a function of the rare earth size
dc.typeArticle de revue
dc.identifier.doi10.5560/ZNB.2013-2296
dc.subject.halChimie/Matériaux
bordeaux.journalZeitschrift fur Naturforschung B
bordeaux.page10-16
bordeaux.volume68
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-00776959
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00776959v1
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