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  • Online-Ressource  (17)
  • Walter de Gruyter GmbH  (17)
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  • Online-Ressource  (17)
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  • Walter de Gruyter GmbH  (17)
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  • 11
    Online-Ressource
    Online-Ressource
    Ferromagnetic Ordering in the Thallide EuPdTl 2
    Walter de Gruyter GmbH ; 2006
    In:  Zeitschrift für Naturforschung B Vol. 61, No. 2 ( 2006-2-1), p. 159-163
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 61, No. 2 ( 2006-2-1), p. 159-163
    Kurzfassung: The new thallide EuPdTl 2 , synthesized from the elements in a sealed tantalum tube in a highfrequency furnace, was investigated by X-ray diffraction on powders and single crystals: MgCuAl 2 type, Cmcm, Z = 4, a = 446.6(1), b = 1076.7(2), c = 812.0(2) pm, wR2 = 0.0632, 336 F 2 values, 16 variables. The structure can be considered as an orthorhombically distorted, palladium-filled variant of the binary Zintl phase EuTl 2 . The palladium and thallium atoms build up a three-dimensional [PdTl 2 ] polya nion with significant Pd-Tl (286 - 287 pm) and Tl-Tl (323 - 329 pm) interactions. The europium atoms fill distorted hexagonal channels of the [PdTl 2 ] polyanion. Susceptibility measurements show a magnetic moment of 7.46(5) μ B /Eu atom, indicative of divalent europium. EuPdTl 2 is a soft ferromagnet with a Curie temperature of T C = 12.5(5) K.
    Materialart: Online-Ressource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2006-0207
    RVK:
    WA 15000
    RVK:
    VA 8360
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2006
    ZDB Id: 2078109-X
    ZDB Id: 124635-5
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  • 12
    Online-Ressource
    Online-Ressource
    Structural Investigation of ScAuSi and ScAuGe using 45 Sc Solid State NMR
    Walter de Gruyter GmbH ; 2007
    In:  Zeitschrift für Naturforschung B Vol. 62, No. 2 ( 2007-2-1), p. 173-176
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 62, No. 2 ( 2007-2-1), p. 173-176
    Kurzfassung: The hexagonal scandium compounds ScAuSi (P6̄m2, a = 421.7(1), c = 680.7(1) pm) and ScAuGe (P63mc, a = 431.03(9), c = 685.5(1) pm) were synthesized in X-ray pure form via arc-melting of the elements. The structures are derived from the AlB 2 -type. The gold and silicon (germanium) atoms build up strongly puckered layers of Au 3 Si 3 and Au 3 Ge 3 hexagons. Due to a different puckering pattern and stacking sequence of the hexagons, the ScAuGe structure has one and the ScAuSi structure two crystallographically independent scandium sites, which can be unambiguously distinguished on the basis of 45 Sc- 29 Si magnetic dipole-dipole interactions measured in a site selective fashion on an isotopically enriched material by solid state NMR.
    Materialart: Online-Ressource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2007-0206
    RVK:
    WA 15000
    RVK:
    VA 8360
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2007
    ZDB Id: 2078109-X
    ZDB Id: 124635-5
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  • 13
    Online-Ressource
    Online-Ressource
    Structure Refinements Of REAuSn (Re = Sm, Gd, Tm)
    Walter de Gruyter GmbH ; 2006
    In:  Zeitschrift für Naturforschung B Vol. 61, No. 8 ( 2006-8-1), p. 1045-1047
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 61, No. 8 ( 2006-8-1), p. 1045-1047
    Kurzfassung: Well-shaped single crystals of the stannides REAuSn (RE = Sm, Gd, Tm) were obtained from arc-melted ingots. The samples were investigated on the basis of X-ray powder and single crystal data: NdPtSb type, P6 3 mc, Z = 2, a = 467.3(1), c = 748.9(2) pm, wR2 = 0.0468, BASF = 0.273(14), 273 F 2 values, 12 variables for SmAuSn, a = 465.14(9), c = 742.4(1) pm, wR2 = 0.0686, 265 F 2 values, 11 variables for GdAuSn, and MgAgAs type, F4̅3m, Z = 4, a = 658.54(9) pm, wR2 = 0.0384, 120 F 2 values, 5 variables for TmAuSn. The [AuSn] networks in SmAuSn and GdAuSn are two-dimensional with intralayer Au-Sn distances of 278 and 277 pm in the slightly puckered Au3Sn3 hexagons, respectively. The interlayer Au-Sn distances of 308 and 302 pm are much longer. TmAuSn has a network of corner-sharing AuSn4/4 tetrahedra with Au-Sn distances of 285 pm. The thulium atoms fill octahedral sites formed by the tin atoms. The crystal chemistry of these REAuSn stannides is briefly discussed
    Materialart: Online-Ressource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2006-0818
    RVK:
    WA 15000
    RVK:
    VA 8360
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2006
    ZDB Id: 2078109-X
    ZDB Id: 124635-5
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  • 14
    Online-Ressource
    Online-Ressource
    Osmium and magnesium: structural segregation in the rare earth-rich intermetallics RE 4 OsMg ( RE =La–Nd, Sm) and RE 9 T Mg 4 ( RE =Gd, Tb)
    Walter de Gruyter GmbH ; 2019
    In:  Zeitschrift für Naturforschung B Vol. 74, No. 6 ( 2019-06-26), p. 519-525
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 74, No. 6 ( 2019-06-26), p. 519-525
    Kurzfassung: Ternary rare earth metal-rich intermetallic phases containing osmium and magnesium were obtained by induction melting of the elements in sealed niobium ampoules under argon followed by annealing in muffle furnaces. The large rare earth elements form the series of Gd 4 RhIn-type ( F 4̅3 m ) intermetallics RE 4 OsMg with RE  = La–Nd and Sm, while the smaller rare earth metals gadolinium and terbium form the Y 9 CoMg 4 -type ( P 6 3 / mmc ) phases Gd 9 OsMg 4 and Tb 9 OsMg 4 . All samples were characterized by X-ray powder diffraction (Guinier technique). The structures of Ce 4 Os 0.973 Mg 1.027 ( a  = 1406.54(7) pm, wR 2 = 0.0478), Nd 4 Os 0.978 Mg 1.022 ( a  = 1402.00(7) pm, wR 2 = 0.0463), Sm 4 Os 0.920 Mg 1.080 ( a  = 1387.33(5) pm, wR 2 = 0.0378) and Gd 9 OsMg 4 ( a  = 971.01(5), c  = 980.43(5) pm, wR 2 = 0.0494) were refined from single-crystal X-ray diffractometer data. The three RE 4 OsMg phases show small degrees of Os/Mg mixing, as is frequently observed for Rh/In in Gd 4 RhIn-type intermetallics. The basic building units in both structures are osmium-centered RE 6 trigonal prisms that are condensed with empty RE 6 octahedra. The magnesium atoms in both types build Mg 4 tetrahedra. The latter are isolated (312 pm Mg–Mg in Ce 4 OsMg) and incorporated within the three-dimensional network of prisms and octahedra in the RE 4 OsMg phases while one observes rows of corner- and face-sharing tetrahedra in Gd 9 OsMg 4 (305 and 314 pm Mg–Mg). In both structure types direct Os–Mg bonding is not observed.
    Materialart: Online-Ressource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2019-0070
    RVK:
    WA 15000
    RVK:
    VA 8360
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2019
    ZDB Id: 2078109-X
    ZDB Id: 124635-5
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 15
    Online-Ressource
    Online-Ressource
    Rows of corner- and face-sharing Mg 4 tetrahedra arranged as hexagonal rod packing in the hexagonal Laves phases RE Mg 2 and the rare earth-rich phases RE 9 CoMg 4 ( RE =Y, Dy-Tm, Lu)
    Walter de Gruyter GmbH ; 2018
    In:  Zeitschrift für Kristallographie - Crystalline Materials Vol. 233, No. 9-10 ( 2018-09-25), p. 607-613
    Details
    In: Zeitschrift für Kristallographie - Crystalline Materials, Walter de Gruyter GmbH, Vol. 233, No. 9-10 ( 2018-09-25), p. 607-613
    Kurzfassung: Six new rare earth metal-rich intermetallic compounds RE 9 CoMg 4 with RE =Y, Dy, Ho, Er, Tm and Lu were synthesized by induction-melting the elements in sealed niobium ampoules followed by annealing in muffle furnaces. The structures of Y 9 CoMg 4 and Tm 8.56 CoMg 4.44 were refined from single-crystal X-ray diffraction data: P 6 3 / mmc , a =965.65(6), c =971.07(5) pm, wR 2=0.0599, 614 F 2 values, 20 variables for Y 9 CoMg 4 and a =945.20(4), c =953.11(5) pm, wR 2=0.0358, 585 F 2 values, 21 variables for Tm 8.56 CoMg 4.44 (a small homogeneity range results from Tm/Mg mixing). The RE 9 CoMg 4 phases crystallize with a coloring variant of the aristotype Co 2 Al 5 . The striking structural motif is a hexagonal rod packing of rows of corner- and face-sharing tetrahedral Mg 4 clusters with Mg–Mg distances ranging from 304 to 317 pm in Y 9 CoMg 4 . These rows are similar to the hexagonal Laves phases RE Mg 2 . The space between the rows is filled with rows of face-sharing Co@Y 6 trigonal prisms (TP) and empty Y 6 octahedra (O) in the sequence –TP–O–O–. The many isopointal coloring variants of the aristotype Co 2 Al 5 are briefly discussed.
    Materialart: Online-Ressource
    ISSN: 2196-7105 , 2194-4946
    URL: Article
    DOI: 10.1515/zkri-2017-2124
    RVK:
    VA 8180
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2018
    SSG: 13
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  • 16
    Online-Ressource
    Online-Ressource
    Ternary indides RE 3 T 2 In 4 ( RE =Dy–Tm; T =Pd, Ir)
    Walter de Gruyter GmbH ; 2018
    In:  Zeitschrift für Naturforschung B Vol. 73, No. 11 ( 2018-11-27), p. 765-772
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 73, No. 11 ( 2018-11-27), p. 765-772
    Kurzfassung: The ternary rare earth transition metal-indides RE 3 T 2 In 4 ( RE =Dy–Tm; T =Pd, Ir) were obtained from high-temperature reactions in sealed niobium ampoules. These indides adopt a hexagonal structure of the Lu 3 Co 1.87 In 4 type (space group P 6̅), a ternary ordered superstructure of the aristotype Fe 2 P. The structures of three different compounds were refined from single-crystal X-ray diffractometer data: a =768.20(6), c =381.97(3) pm, 1441 F 2 values, 24 parameters, wR 2=0.0338 (Ho 3 Pd 1.90 In 4 ); a =774.98(3), c =378.51(2) pm, 577 F 2 values, 23 parameters, wR 2=0.0742 (Ho 3 Ir 1.69 In 4.31 ) and a =780.3(1), c =369.4(1) pm, 573 F 2 values, 22 parameters, wR 2=0.0403 (Tm 3 Ir 1.51 In 4.49 ). Refinements of the occupancies revealed homogeneity ranges in case of the iridium-based crystals resulting from Ir/In mixing. The refined composition of the palladium compound was Ho 3 Pd 1.90 In 4 resulting from defects on the Wyckoff position 1 d , which was already reported for the prototype Lu 3 Co 1.87 In 4 . The geometrical motifs of the RE 3 T 2 In 4 structures are three different types of tricapped trigonal prisms around the transition metal and indium atoms which are condensed via common edges and triangular faces. Temperature dependent magnetic susceptibility measurements of Dy 3 Ir 2 In 4 and Tm 3 Ir 2 In 4 showed Curie-Weiss behavior and the experimental magnetic moments of 10.59(2) μ B (Dy 3 Ir 2 In 4 ) and 7.40(2) μ B (Tm 3 Ir 2 In 4 ) confirming stable trivalent RE 3+ states. Dy 3 Ir 2 In 4 and Tm 3 Ir 2 In 4 order antiferromagnetically with Néel temperatures of T N =13.6(5) and 5.4(5) K, respectively.
    Materialart: Online-Ressource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2018-0091
    RVK:
    WA 15000
    RVK:
    VA 8360
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2018
    ZDB Id: 2078109-X
    ZDB Id: 124635-5
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 17
    Online-Ressource
    Online-Ressource
    Structure, Chemical Bonding and 119 Sn Mössbauer Spectroscopy of LaRhSn and CeRhSn
    Walter de Gruyter GmbH ; 2005
    In:  Zeitschrift für Naturforschung B Vol. 60, No. 10 ( 2005-10-1), p. 1036-1042
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 60, No. 10 ( 2005-10-1), p. 1036-1042
    Kurzfassung: The rare earth (RE) stannides LaRhSn and CeRhSn were prepared from the elements by arcmelting or by reactions in sealed tantalum tubes in a high-frequency furnace. The structures have been refined from X-ray single crystal diffractometer data: ZrNiAl type, P6̅2̅m, a = 748.74(5), c = 422.16(3) pm, wR2 = 0.0307, 310 F 2 values for LaRhSn and a = 745.8(1), c = 408.62(9) pm, wR2 = 0.0397, 354 F 2 values for CeRhSn with 14 variables per refinement. The structures contain two crystallographically different rhodium sites which both have a tricapped trigonal prismatic coordination: [Rh1Sn 3 RE 6 ] and [Rh2Sn 6 RE 3 ]. Together the rhodium and tin atoms (280 - 288 pm Rh-Sn distances in LaRhSn and 277 - 285 pm in CeRhSn) build up three-dimensional [RhSn] networks in which the rare earth atoms fill distorted hexagonal channels. DFT band structure calculations reveal a large cerium 4 f contribution at the Fermi level and a strong mixing of cerium 5d/4 f with rhodium 4d orbitals. These results are in agreement with the short Ce-Rh bonds (304 and 309 pm) and also with the electronic and magnetic properties. 119 Sn Mössbauer spectra of LaRhSn and CeRhSn show a single tin site at isomer shifts of δ = 1.98(2) (LaRhSn) and 1.79(1) mm/s (CeRhSn) subject to quadrupole splitting of Δ E Q = 0.79(4) (LaRhSn) and 1.12(3) mm/s (CeRhSn). The 1.8 K data show no transferred hyperfine field at the tin site for CeRhSn.
    Materialart: Online-Ressource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2005-1003
    RVK:
    WA 15000
    RVK:
    VA 8360
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2005
    ZDB Id: 2078109-X
    ZDB Id: 124635-5
    Standort Signatur Einschränkungen Verfügbarkeit
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