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  • 1
    Online Resource
    Online Resource
    Synthesis, structure and properties of Nd 2 BC containing the trans -dibora–(1,3)-butadiene [C=B–B=C] 8– -unit
    Walter de Gruyter GmbH ; 2011
    In:  Zeitschrift für Kristallographie Vol. 226, No. 1 ( 2011-01), p. 93-98
    Details
    In: Zeitschrift für Kristallographie, Walter de Gruyter GmbH, Vol. 226, No. 1 ( 2011-01), p. 93-98
    Abstract: The crystal structure of Nd 2 BC, synthesized by arc melting of the element mixture, repeated in a high frequency furnace and subsequent annealing at 1070 K, has been determined from single crystal X-ray diffraction data. It crystallizes in a new structure type in the monoclinic space group C 2/ m ( a = 12.732(2) Å, b = 3.6848(4) Å, c = 9.398(2) Å, β = 130.43(1)°, R 1 = 0.038 ( wR 2 = 0.091) for 596 reflections with I o 〉 2 σ ( I o )). Characteristic building units are C—B—B—C entities with the distances d C—B = 1.51(2) Å and d B—B = 1.65(2) Å. These units are embedded in a framework of neodymium atoms resulting from the stacking of slightly corrugated two-dimensional square nets of Nd. Within the ionic limit Nd 2 BC can be described as (Nd 2+ ) 4 [C—B—B—C] 8– or (Nd 3+ ) 4 [CBBC] 8– · 4 e – with [C=B—B=C] 8– units, which are isoelectronic to 1,3-butadiene. The measured magnetic moment of 3.65 μ B per Nd atom in Nd 2 BC is in good agreement with the expected value of 3.62 μ B for 4f 3 configuration. LMTO band structure calculations show that Nd 2 BC is metallic and the extra electrons occupy mainly bonding Nd-5d and antibonding π* states within the C—B—B—C units.
    Type of Medium: Online Resource
    ISSN: 0044-2968
    URL: Article
    DOI: 10.1524/zkri.2011.1322
    RVK:
    TE 1000
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2011
    SSG: 13
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  • 2
    Online Resource
    Online Resource
    Crystal structure of trilanthanum-triiodide-monoethanide, C2I3La3
    Walter de Gruyter GmbH ; 2008
    In:  Zeitschrift für Kristallographie - New Crystal Structures Vol. 223, No. 2 ( 2008-06), p. 107-108
    Details
    In: Zeitschrift für Kristallographie - New Crystal Structures, Walter de Gruyter GmbH, Vol. 223, No. 2 ( 2008-06), p. 107-108
    Type of Medium: Online Resource
    ISSN: 2197-4578 , 1433-7266
    URL: Article
    DOI: 10.1524/ncrs.2008.0045
    Language: Unknown
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2008
    detail.hit.zdb_id: 2039576-0
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  • 3
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    Online Resource
    Notizen: Y 7 I 6 C 3 O: Ein Carbidoxid mit kondensierten Y 6 C-Oktaedern und Y 4 O-Tetraedern / Y 7 I 6 C 3 O: A Carbide Oxide with Condensed Y 6 C-Octahedra and Y 4 O-Tetrahedra
    Walter de Gruyter GmbH ; 1993
    In:  Zeitschrift für Naturforschung B Vol. 48, No. 12 ( 1993-12-1), p. 1828-1830
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 48, No. 12 ( 1993-12-1), p. 1828-1830
    Abstract: The new compound Y 7 I 6 C 3 O is prepared by reaction of stoichiometric amounts of Y, YI 3 , Y 2 O 3 and C in closed Ta capsules at 1370 K. Y 7 I 6 C 3 O forms bronze coloured, metallic, air and moisture sensitive crystals. It crystallizes in the space group Pmma (No. 51) with the lattice constants a = 2249.4(4), b = 383.7(1), c = 1079.1(1) pm. Within the crystal structure the C atoms and the O atoms are surrounded by Y atoms octahedrally and tetrahedrally, respectively. The Y 6 C octahedra and Y 4 O tetrahedra are condensed to form ondulated layers, which are separated by double layers of I atoms.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-1993-1220
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1993
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 4
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    Online Resource
    Ordnung und Fehlordnung der Anionen in tetragonalen Boridcarbiden der Seltenerdmetalle / Order and Disorder of Anions in Tetragonal Boride Carbides of Rare Earth Metals
    Walter de Gruyter GmbH ; 2004
    In:  Zeitschrift für Naturforschung B Vol. 59, No. 11-12 ( 2004-12-01), p. 1551-1562
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 59, No. 11-12 ( 2004-12-01), p. 1551-1562
    Abstract: Compounds that feature the metal atom substructure of “La 5 B 2 C 6 ” are known for most rare earth metals (Ln). They are characterized by two types of voids surrounded by large bicapped tetragonal antiprisms and smaller distorted octahedra, respectively. For many rare earth elements, a huge variation of lattice parameters has been observed for the corresponding compounds. A series of structure determinations has beed performed in order to elucidate the reasons for this remarkable stability range. The compounds of the earlier lanthanoids (La-Nd) exhibit broad ranges of homogeneity that are due to varying occupancy of octahedral voids which can be empty or filled by varying amounts of C atoms or C 2 groups. However, the larger voids are fully occupied with disordered C 3 B groups. In most cases the disorder is completely statistical with only a few exceptions. In contrast, two different phases have been observed in the case of late rare earth metals (starting from Gd). Their ranges of homogeneity are moderate, and the larger voids are fully occupied by ordered CBC entities. The difference between these two types of phases concerns the octahedral voids which contain C atoms in the case of compounds with the idealized composition Ln 5 B 2 C 5 and C 2 groups for Ln 5 B 2 C 6 , respectively. Positional disorder is possible for both C atoms and C 2 groups. Therefore, no single well-defined compound is known that possesses the metal atom arrangement of “La 5 B 2 C 6 ”.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2004-11-1228
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2004
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 5
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    Online Resource
    La 3 Cl 3 BC – Structure, Bonding and Electrical Conductivity
    Walter de Gruyter GmbH ; 2005
    In:  Zeitschrift für Naturforschung B Vol. 60, No. 5 ( 2005-5-1), p. 499-504
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 60, No. 5 ( 2005-5-1), p. 499-504
    Abstract: A new rare earth carbide boride halide, La 3 Cl 3 BC, has been prepared by heating a mixture of stoichiometric quantities of LaCl 3 , La, B and C at 1050 °C for 10 days. La 3 Cl 3 BC (La 3 Br 3 BC type) crystallizes in the monoclinic system with space group P2 1 /m (No. 11), a = 8.2040(16), b = 3.8824(8), c=11.328(2)Å , β =100.82(3)°. In the structure, monocapped trigonal prisms containing B-C units are condensed into chains along the b direction, and the chains are further linked by Cl atoms in the a and c directions. The condensation results in a polymeric anion 1 ∞ [BC] with a spine of B atoms in a trigonal prismatic coordination by La, and the C atoms attached in a square pyramidal coordination. The B-B and B-C distances are 2.16 and 1.63 Å , respectively. La 3 Cl 3 BC is metallic. The EH calculation shows that the distribution of valence electrons can be formulated as (La 3+ ) 3 (Cl − ) 3 (BC) 5− · e − .
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2005-0504
    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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  • 6
    Online Resource
    Online Resource
    Crystal Structure of the Terbium Borocarbide Tb 2 B 2 C 3
    Walter de Gruyter GmbH ; 2008
    In:  Zeitschrift für Naturforschung B Vol. 63, No. 8 ( 2008-8-1), p. 929-933
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 63, No. 8 ( 2008-8-1), p. 929-933
    Abstract: The title compound was prepared from the elements by arc-melting followed by annealing in silica tubes at 1270 K for one week. The crystal structure was investigated by means of single-crystal X-ray diffraction: space group Cmmm, a = 3.412(1), b = 13.699(8), c = 3.669(1) Å, V = 171.5(1) Å 3 , Z = 2, R1 = 0.032; wR2 = 0.087 for 123 unique reflections with I o ≥ 2σ (I o ) and 11 refined parameters.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2008-0802
    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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  • 7
    Online Resource
    Online Resource
    Pr 2 CBr: Ein Ferromagnet mit Pr 2 C-Schichten/ Pr 2 CBr: A Ferromagnet with Pr 2 C Layers
    Walter de Gruyter GmbH ; 2009
    In:  Zeitschrift für Naturforschung B Vol. 64, No. 4 ( 2009-4-1), p. 371-374
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 64, No. 4 ( 2009-4-1), p. 371-374
    Abstract: Pr 2 CBr: Ein Ferromagnet mit Pr 2 C-Schichten/ Pr 2 CBr: A Ferromagnet with Pr 2 C Layers
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2009-0402
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2009
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 8
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    Online Resource
    Y 7 I 12 C 2 N: Eine Verbindung aus Einheiten zweier Y 6 (C 2 )-Oktaeder und eines Y 6 N 2 -Tetraederdoppels / Y 7 I 12 C 2 N: A Compound with Units of Two Y 6 (C 2 ) Octahedra and a Y 6 N 2 Double Tetrahedron
    Walter de Gruyter GmbH ; 1995
    In:  Zeitschrift für Naturforschung B Vol. 50, No. 6 ( 1995-6-1), p. 931-936
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 50, No. 6 ( 1995-6-1), p. 931-936
    Abstract: The new compounds Y 7 I 12 C 2 N and Ho 7 I 12 C 2 N have been prepared by reaction of stoichiometric amounts of the metals (RE), REI 3 , REN and C in closed Ta capsules at 1150 and 1120K, respectively. Pure samples of the compounds were obtained after 5 days annealing time. The crystals with xenomorphic shape are olive-green (Y 7 I 12 C 2 N) or red-brown (Ho 7 I 12 C 2 N) in colour and sensitive to air and moisture. Y 7 I 12 C 2 N crystallizes in the space group P 1̄ (No. 2) with lattice constants a = 971.24(7), b = 1030.38(7), c = 1673.58(11) pm and α = 101.366(5), β = 92.758(5), γ = 112.799(5)°. According to Guinier photographs Ho7I12C2N is isotypic with the lattice consiants u - 968.8(3), b = 1028.7(3), r. = 1667.8(5) pm and α = 101.31(2), β = 92.78(2), γ = 112.80(1)°. In the structure the C atoms are present as C 2 units with a C -C distance of 144 pm. These C 2 units are octahedrally coordinated by Y atoms (o 1 ). The N atoms are in the center of Y 4 tetrahedra, which are linked via a common edge to form double tetrahedra (t 2 ). By condensation of N-centered double tetrahedra (t 2 ) with a C 2 -centered Y octahedron (o 1 ) the characteristic units o 1 t 2 o 1 are formed. The I atoms coordinate all free edges and corners of these units and connect them via I i - I a contacts parallel [100] and [001] . The compounds are semiconducting. Ho 7 I 12 C 2 N exhibits Curie-Weiss behaviour with θ = 15(1) K and μ eff = 10.5(1) μ B .
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-1995-0615
    RVK:
    WA 15000
    RVK:
    VA 8360
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 1995
    detail.hit.zdb_id: 2078109-X
    detail.hit.zdb_id: 124635-5
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  • 9
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    Dysprosiumcarbidiodide Dy 10 (C 2 ) 2 I 18 , Dy 4 (C 2 )I 6 und Dy 12 (C 2 ) 3 I 17 / Dysprosium Carbide Iodides Dy 10 (C 2 ) 2 I 18 , Dy 4 (C 2 )I 6 , and Dy 12 (C 2 ) 3 I 17
    Walter de Gruyter GmbH ; 2007
    In:  Zeitschrift für Naturforschung B Vol. 62, No. 2 ( 2007-2-1), p. 148-154
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 62, No. 2 ( 2007-2-1), p. 148-154
    Abstract: The title compounds are formed by reaction of Dyl 3 , Dy metal and C in stoichiometric amounts in closed Ta ampoules, Dy 10 (C 2 ) 2 I 18 at 930 °C 7days, Dy 4 (C 2 )I 6 at 950 °C for 6 days and Dy 12 (C 2 ) 3 I 17 at 900 °C for 11 days as pure samples according to X-ray powder diffraction. Dy 10 (C 2 ) 2 I 18 crystallizes in space group P2 1/c with a = 10.470(2), b = 17.152(3), c = 13.983(3) Å and β = 121.14(3)°, Dy 4 (C 2 )I 6 in Pnnm with a = 13.622(3), b = 14.335(3) and c = 8.396(2) Å , and Dy 12 (C 2 ) 3 I 17 in C2/c with a = 19.149(4), b = 12.069(2), c = 18.595(4) Å , and β = 90.54(3)°. The crystal structure of Dy 10 (C 2 ) 2 I 18 is composed of Dy double octahedra centered by (C2) 6− groups (ethanide) with the iodide ions above the edges and the corners of the Dy 10 (C 2 )2 units. In Dy 4 (C 2 )I 6 the Dy atoms form chains of trans-edge sharing octahedra with embedded (C 2 ) groups. In the structure of Dy 12 (C 2 ) 3 I 17 alternately cis-, trans-edge-condensed Dy 6 octahedra centered by (C 2 ) groups occur. The iodine atoms surround the chains like in the M 6 X 12 cluster and interconnect neighboring chains.
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2007-0202
    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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  • 10
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    Online Resource
    Einige Phosphidhalogenide des Lanthans und verwandte Verbindungen/ Some Phosphide Halides of Lanthanum and Related Compounds
    Walter de Gruyter GmbH ; 2007
    In:  Zeitschrift für Naturforschung B Vol. 62, No. 11 ( 2007-11-1), p. 1377-1382
    Details
    In: Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 62, No. 11 ( 2007-11-1), p. 1377-1382
    Abstract: The pnictide halides La 2 I 2 P, La 2 I 2 As, La 2 I 2 Sb, La 2 Br 2 P and Y 2 Br 2 P have been synthesized from lanthanum and yttrium, red phosphorus, arsenic, and antimony, respectively, and the corresponding metal trihalides. Their structures contain close-packed metal atom double layers with pnicogen atoms in the octahedral voids. These layers are sandwiched by halogen atom layers. The compounds crystallize in the trigonal 1T-type with one sandwich-like layer per unit cell, or in the rhombohedral 3R-type with three layers per unit cell. Polytypism and twinning have been observed. For 3R-La 2 I 2 P, conductivity measurements have shown metallic behaviour
    Type of Medium: Online Resource
    ISSN: 1865-7117 , 0932-0776
    URL: Article
    DOI: 10.1515/znb-2007-1105
    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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