Ternary magnesium compounds RE23Ni7Mg4 (RE = La, Ce, Pr, Nd, Sm) with Pr23Ir7Mg4 type structure
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | TUNCEL, Selcan | |
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | HERMES, Wilfried | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | CHEVALIER, Bernard | |
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | RODEWALD, Ute Ch. | |
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | PÖTTGEN, Rainer | |
| dc.date.issued | 2008 | |
| dc.identifier.issn | 0044-2313 | |
| dc.description.abstractEn | New 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.iso | en | |
| dc.publisher | Wiley-VCH Verlag | |
| dc.subject.en | Rare earth compounds | |
| dc.subject.en | Magnesium | |
| dc.subject.en | Magnetism | |
| dc.subject.en | Crystal chemistry | |
| dc.title.en | Ternary magnesium compounds RE23Ni7Mg4 (RE = La, Ce, Pr, Nd, Sm) with Pr23Ir7Mg4 type structure | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1002/zaac.200800071 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie | |
| bordeaux.page | 2140-2144 | |
| bordeaux.volume | 634 | |
| bordeaux.issue | 12-13 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00331169 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00331169v1 | |
| bordeaux.COinS | ctx_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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