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  • Online Resource  (7)
  • Walter de Gruyter GmbH  (7)
  • 2005-2009  (7)
  • 1
    Online Resource
    Online Resource
    The High-temperature Modification of LuAgSn and High-pressure High-temperature Experiments on DyAgSn, HoAgSn, and YbAgSn
    Walter de Gruyter GmbH ; 2008
    In:  Zeitschrift für Naturforschung B Vol. 63, No. 2 ( 2008-2-1), p. 193-198
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 63, No. 2 ( 2008-2-1), p. 193-198
    Abstract: The high-temperature modification of LuAgSn was obtained by arc-melting an equiatomic mixture of the elements followed by quenching the melt on a water-cooled copper crucible. HT-LuAgSn crystallizes with the NdPtSb-type structure, space group P6 3 mc: a = 463.5(1), c = 723.2(1) pm, wR2 = 0.0270, 151 F 2 , and 11 variables. The silver and tin atoms build up two-dimensional, puckered [Ag 3 Sn 3 ] networks (276 pm Ag-Sn) that are charge-balanced and separated by the lutetium atoms. The Ag-Sn distances between the [Ag 3 Sn 3 ] layers of 294 pm are much longer. Single crystals of isotypic DyAgSn (a = 468.3(1), c = 734.4(1) pm, wR 2 = 0.0343, 411 F 2 , and 11 variables) and HoAgSn (a = 467.2(1), c = 731.7(2) pm, wR 2 = 0.0318, 330 F 2 , and 11 variables) were obtained from arc-melted samples. Under high-pressure (up to 12.2 GPa) and high-temperature (up to 1470 K) conditions, no transitions to a ZrNiAl-related phase have been observed for DyAgSn, HoAgSn, and YbAgSn. HT-TmAgSn shows Curie-Weiss paramagnetism with μ eff = 7.53(1) μ B /Tm atom and θ P = −15.0(5) K. No magnetic ordering was evident down to 3 K. HT-LuAgSn is a Pauli paramagnet. Room-temperature 119 Sn Mössbauer spectra of HT-TmAgSn and HT-LuAgSn show singlet resonances with isomer shifts of 1.78(1) and 1.72(1) mm/s, respectively
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2008-0213
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2008
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 2
    Online Resource
    Online Resource
    Structure and Properties of α- and β-CeCuSn: A Single Crystal and Mössbauer Spectroscopic Investigation
    Walter de Gruyter GmbH ; 2007
    In:  Zeitschrift für Naturforschung B Vol. 62, No. 5 ( 2007-5-1), p. 647-657
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 62, No. 5 ( 2007-5-1), p. 647-657
    Abstract: Two modifications of CeCuSn were prepared from the elements: the high-temperature (β ) modification crystallizes directly from the quenched sample, while the low-temperature (α) modification is formed after annealing at 700 °C for one month. Both modifications were investigated by powder and single crystal X-ray diffraction. We find for β -CeCuSn the ZrBeSi-type structure, space group P6 3 /mmc, a = 458.2(1), c = 793.7(2) pm, wR2 = 0.0727, 148 F 2 values, 8 variable parameters. In the case of α-CeCuSn we find the NdPtSb-type structure, space group P6 3 mc, a = 458.4(1), c = 785.8(2) pm, wR2 = 0.0764, 233 F 2 values, 11 variable parameters. The copper and tin atoms build up layers of ordered [Cu3Sn3] hexagons. The layers are planar in β -CeCuSn, however, with highly anisotropic displacements of the copper and tin atoms. In α-CeCuSn a puckering effect is observed resulting in a decrease of the c lattice parameter. Both modifications of CeCuSn exhibit antiferromagnetic ordering, but there is a considerable difference in their magnetic behaviour. Anomalies in the physical properties of the α- and β -modifications of CeCuSn have been detected by Mössbauer spectroscopy and magnetic and specific heat measurements, which serve to explain the structure-property relations.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2007-0504
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2007
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 3
    Online Resource
    Online Resource
    Structure, Magnetic Properties and 151 Eu, 119 Sn Mössbauer Spectroscopy of Eu 5 Sn 3 S 12 and Eu 4 LuSn 3 S 12
    Walter de Gruyter GmbH ; 2007
    In:  Zeitschrift für Naturforschung B Vol. 62, No. 1 ( 2007-1-1), p. 5-14
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 62, No. 1 ( 2007-1-1), p. 5-14
    Abstract: Eu 5 Sn 3 S 12 and Eu 4 LuSn 3 S 12 were synthesized and their structures refined from single crystal data (Pmc2 1 , Eu 5 Sn 3 S 12 : a = 3.908(1), b = 20.115(4), c = 11.451(2) Å ; wR2 = 0.0519 for 3048 F 2 and 122 parameters; Eu 4 LuSn 3 S 12 : a = 3.920(1), b = 20.132(4), c = 11.459(2) Å ; wR2 = 0.0737 for 3298 F 2 and 122 parameters). The structures contain one-dimensional chains of edge-sharing SnS 2 S 4/2 octahedra and corner-sharing SnS3S2/2 trigonal bipyramids, running parallel to [100]. Five europium sites are seven- or eightfold coordinated by sulfur atoms. Lutetium atoms in Eu 4 LuSn 3 S 12 show a strong site preference for one of the two Eu 3+ positions of Eu 5 Sn 3 S 12 and no structural disorder was observed. Both compounds show static mixed valence according to Eu 2+ 3 Eu 3+ 2 Sn 4+ 3 S 2− 12 and Eu 2+ 3 Eu 3+ Lu 3+ Sn 4+ 3 S 2− 12 , which was confirmed by temperature dependent magnetic susceptibility measurements. The experimental magnetic moments of 14.6(1) (Eu 5 Sn 3 S 12 ) and 14.1(1) (Eu 4 LuSn 3 S 12 ) μ B /f.u. indicate that each of the two sulfides contains three divalent europium atoms per formula unit. Magnetic ordering for Eu 5 Sn 3 S 12 and Eu 4 LuSn 3 S 12 sets in below 5 and 3 K, respectively. Both sulfides show metamagnetic or spin-flip transitions in the magnetization curves at 3 K (2 K) with full saturation of the europium magnetic moments at 3 K (2 K) and 80 kOe. 151 Eu Mössbauer spectra fully confirm the Eu 2+ and Eu 3+ site occupancies. At 4.2 K an increase in line width indicates small hyperfine fields at the europium nuclei.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2007-0102
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2007
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 4
    Online Resource
    Online Resource
    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
    Abstract: 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.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2007-0206
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2007
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 5
    Online Resource
    Online Resource
    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
    Abstract: 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
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2006-0818
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2006
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 6
    Online Resource
    Online Resource
    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
    Abstract: 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.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2005-1003
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2005
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 7
    Online Resource
    Online Resource
    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
    Abstract: 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.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2006-0207
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2006
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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