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  • Online Resource  (3)
  • Walter de Gruyter GmbH  (3)
  • Rayaprol, Sudhindra  (3)
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  • Online Resource  (3)
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  • Walter de Gruyter GmbH  (3)
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  • 1
    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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    Online Resource
  • 2
    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
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    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
    Location Call Number Limitation Availability
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    Online Resource
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