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1Author    Ratikanta Mishra, Rainer Pöttgen, Gunter KotzybaRequires cookie*
 Title    New Metal-Rich Compounds NblrSi, NblrGe, and TalrSi -Synthesis, Structure, and Magnetic Properties  
 Abstract    The metal-rich intermetallic compounds NblrSi, NblrGe, and TalrSi were synthesized by arc-melting of the elements and subsequent annealing in glassy carbon crucibles in a high-fre-quency furnace. The three compounds were investigated by X-ray diffraction on powders and single crystals: TiNiSi type, Pnma, a = 641.27(3), b = 379.48(2), c = 727.70(3) pm, wR2 = 0.0773, 430 F 2 values for NblrSi, a = 645.48(3), b = 389.21(2), c = 741.11(4) pm, wR2 = 0.0981, 297 F 2 values for NblrGe, and a = 638.11(3), b = 378.69(2), c = 726.78(3) pm, wR2 = 0.0887, 290 F 2 values for TalrSi with 20 variables for each refinement. The iridium and silicon (germanium) atoms form a three-dimensional network of puckered IrjSi3 and Ir3Ge3 hexagons in which the niobium (tantalum) atoms fill larger cages. Magnetic susceptibility measurements on NblrSi and TalrSi indicate Pauli paramagnetism with room temperature susceptibilities of 0.30(5)-10~9 and 0.97(5)-10-9 m3/mol, respectively. 
  Reference    Z. Naturforsch. 56b, 463 (2001); received April 30 2001 
  Published    2001 
  Keywords    Silicides, Germanides, Magnetic Properties 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0463.pdf 
 Identifier    ZNB-2001-56b-0463 
 Volume    56 
2Author    Thom As Fickenscher, G. Unter Kotzyba, Rolf-D Ieter, H. Offm, Ann, R. Ainer Pöttgen, H. P. FritzRequires cookie*
 Title    Synthesis, Structure, and Magnetic Properties of EuAgCd and YbAgCd  
 Abstract    New intermetallic compounds EuAgCd and YbAgCd were synthesized in quantitative yield by reaction of the elements in sealed tantalum tubes in a high-frequency furnace. Both com­ pounds were investigated by X-ray diffraction on powders and single crystals: KHg2 type, Imma, a = 490.41(8), b = 771.0(1), c = 834.4(2) pm, wR2 = 0.0624, 255 F values, 12 variables for EuAgCd, and MgZn2 type, Pb^/mmc, a = 584.66(5), c = 946.83(9) pm, wR2 = 0.0502, 187 F 2 values, 11 variables for YbAgCd. Owing to the very small difference in scattering power, no long range ordering of the silver and cadmium atoms is evident from the X-ray data, although Ag-Cd ordering is expected. The silver and cadmium atoms randomly occupy the mercury and zinc positions of the KHg2 and MgZn2 type structures, respectively. In EuAgCd the [AgCd] substructure consists of strongly puckered, orthorhombically distorted Ag3 Cd3 hexagons, while a three-dimensional network of face-and comer-sharing tetrahedra is observed in YbAgCd. The rare earth atoms fill the space between the Ag3 Cd3 hexagons (EuAgCd) or within the three-dimensional tetrahedral network (YbAgCd). Magnetic susceptibility measurements in­ dicate Pauli paramagnetism for YbAgCd and Curie-Weiss behavior above 60 K for EuAgCd with an experimental magnetic moment of 7.82(3) /j b/Eu indicating divalent ytterbium and europium. Ferromagnetic ordering at Tc = 28.0(5) K is observed for EuAgCd. At 2 K and 5 T the saturation magnetization is 5.85(5) /iß/Eu. 
  Reference    Z. Naturforsch. 56b, 598—603 (2001); received April 12 2001 
  Published    2001 
  Keywords    Cadmium, Crystal Structure, Magnetic Properties 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0598.pdf 
 Identifier    ZNB-2001-56b-0598 
 Volume    56 
3Author    Martin Pfisterer, Günter NagorsenRequires cookie*
 Title    Bindungsverhältnisse und magnetische Eigenschaften ternärer Arsenide ET2As2 Bonding and Magnetic Properties in Ternary Arsenides ET2AS2  
 Abstract    The interatomic distances of ternary arsenides ET2AS2 with ThCr2Si2-structure were determined by X-ray powder methods (E = Ca, Sr, Ba; T = Cr, Fe, Co, Ni, Cu). The phases were found to behave according to the Zintl-Klemm-Busmann concept. Magnetic susceptibilities were measured. 
  Reference    Z. Naturforsch. 38b, 811—814 (1983); eingegangen am 21. März 1983 
  Published    1983 
  Keywords    Ternary Arsenides, Crystallographic Data, Magnetic Properties 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0811.pdf 
 Identifier    ZNB-1983-38b-0811 
 Volume    38 
4Author    Wolfgang Jeitschko, Reinhold BrinkRequires cookie*
 Title    Preparation, Crystal Structures and Properties of Two Modifications of UCr6P4  
 Abstract    U Cr6P4 was prepared from a tin flux in two forms at low (a) and high (ß) temperatures (880 °C and 1000 °C), respectively. The crystal structures o f both m odifications were deter­ 
  Reference    Z. Naturforsch. 47b, 192—196 (1992); received September 5 1991 
  Published    1992 
  Keywords    Tin Flux, Crystal Structure, Magnetic Properties, Structural Relationships 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0192.pdf 
 Identifier    ZNB-1992-47b-0192 
 Volume    47 
5Author    YalcinE. Lerm Ana+, MehmetK. Abaka, Ingrid Svobodab, H. Artm Ut Fuessb-, KlausG. Riesarc, WolfgangH. AasecRequires cookie*
 Title    X-Ray Structure and Magnetic Properties of the Tetracupferronato-bis(//-methoxy)-diiron(III) Complex  
 Abstract    The tetracupferronato-bis(w-methoxy)-diiron(III) complex has been synthesized in aceto­ nitrile and its crystal structure determined. C i6H->6N80 1(>Fe2, monoclinic, space group C2/c, a =18.425(3), b = 12.999(2), c = 15.046(3) A, ß = 12 4 .6 6 (2)°,> = 2964(1) A , Z = 4, wR(2) = 0.097 from 1491 reflections (F2). Two iron(III) atoms are at special positions in six-fold co­ ordination, bridged by O with a F e -O -F e angle of 102.4(1)° and a distance between two iron(III) centers of 3.075(1) A. Temperature-dependent magnetic susceptibility measure­ ments reveal a antiferromagnetic exchange interaction (J = -1 4 cm -1) betw een the iron(III) centers. 
  Reference    Z. Naturforsch. 50b, 1587—1590 (1995); received January 11 1995 
  Published    1995 
  Keywords    X -Ray, Magnetic Properties, Antiferromagnetic Coupling 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1587.pdf 
 Identifier    ZNB-1995-50b-1587 
 Volume    50 
6Author    W. Müncha, L. Walz, M. KönigbRequires cookie*
 Title    Magnetische Eigenschaften von [C u JO C ^ C F ^ N ^ H t^ IN C O ^ im Bereich von 10 bis 240 K Magnetic Properties of [Cu{OCH2CH2N(C4H9)2 }NCO]4 in the Temperature Range from 10 to 240 K  
 Abstract    The magnetic properties of the title compound were re-investigated, since a new phase below 240 K has recently been identified. The exchange parameters were evaluated from the temperature dependence of the magnetic susceptibility with a Heisenberg operator taking into account the high pseudo-symmetry of the tetrameric units observed. 
  Reference    (Z. Naturforsch. 53b, 58—62 [1998]; eingegangen am 16. Oktober 1995 -31. Oktober 1997) 
  Published    1998 
  Keywords    Copper Complexes, Magnetic Properties, Theoretical Calculations 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0058.pdf 
 Identifier    ZNB-1998-53b-0058 
 Volume    53 
7Author    G. A. Ennas, Falqur, G. Piccaluga, S. Solinas, D. Gatteschi, C. Sangregorio, A. BenedettiRequires cookie*
 Title    Properties of Nanocrystalline Nickel Particles in Ni-Si0 2 Composites  
 Abstract    Nickel-Silica nanocomposites with a nickel content equal to 10, 15, 20 wt% have been prepared by a sol-gel method starting from ethanolic solutions of tetraethoxysilane and nickel nitrate hex-ahydrate. After selation the samples were reduced in H-> flow at selected temperature (450 °C < T < 600 °C). The morphological, structural and magnetic properties were investigated by transmission electron microscopy (TEM), wide and small angle X-ray scattering (WAXS, SAXS), magnetic susceptibility in zero field cooled and field cooled mode (ZFC and FC), and magnetic hysteresis loop. Nanometric nickel particles are observed in all the investigated samples. TEM, WAXS and SAXS techniques indicate that the average nickel particle size grows slightly but almost regularly with the nickel concentration. TEM results moreover indicate that also the width of the particle size distribution, which can be simulated by log-normal functions, follows this trend. All the sample treated in hydrogen show superparamagnetic behaviour. The magnetisation falls to reach saturation up to highest measuring field of 70 kOe even at 3 K, while the observed coercivity H c is much higher than the theoretical bulk one. Some uncertainty in the complete interpretation of the sequence of magnetic measurements is attributed to a progressive oxidation of the samples when these are air exposed. 
  Reference    Z. Naturforsch. 55a, 581—588 (2000); received March 9 2000 
  Published    2000 
  Keywords    Nanocomposites, Nickel-Silica, X-ray Diffraction, TEM, Magnetic Properties 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0581.pdf 
 Identifier    ZNA-2000-55a-0581 
 Volume    55 
8Author    Thomas Gerdau, Reinhard KramolowskyRequires cookie*
 Title    Koordinationschemie von Liganden mit den Donatoren Phosphor und Schwefel, I Nickel(II)-Komplexe mit Phosphinomethylthioethera als Liganden Gleichgewicht zwischen planarem und tetraedrischem Nickel(II) Coordination Chemistry of Ligands with the Donors Phosphorus and Sulfur, I Nickel(II) Complexes with Phosphinomethylthioethers as Ligands A Planar-Tetrahedral Equilibrium with Nickel(II)  
 Abstract    The preparation and structural characterization of phosphinomethylthioethernickel(II) complexes of the general type [NiX2(Ph2PCH2SR)2] (X = CI, Br, I, NCS: R = Me, Ph) are reported. In all the complexes the phosphinomethylthioethers act as monodentate ligands coordinating via the phosphorus atom. The isothiocyanate complexes are diamagnetic both in solution and in the solid state and have been assigned trans-planar configuration. As shown by magnetic measurements and by electronic spectroscopy, the halo complexes exhibit a square-planar (diamagnetic) ^ distorted-tetrahedral (paramagnetic) equilibrium in solution, while in the solid state the complexes are either square-planar or distorted-tetrahedral. For the complex [NiBr2(Ph2PCH2SMe)2] both isomers have been isolated in the solid state. 
  Reference    Z. Naturforsch. 37b, 332—340 (1982); eingegangen am 20. November 1981 
  Published    1982 
  Keywords    Phosphinomethylthioethernickel(II) Complexes, Planar-Tetrahedral Equilibrium, Electronic Spectra, Magnetic Properties 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0332.pdf 
 Identifier    ZNB-1982-37b-0332 
 Volume    37 
9Author    L. Horner, U. KapsRequires cookie*
 Title    Studien zum Vorgang der Wasserstoffübertragung, 77 [1] Hydrierungs-und Desulfurierungsstudien mit Raney-Nickel und Nickel-Träger-Katalysatoren Studies on the Occurrence of Hydrogen Transfer, 77 [1] Hydrogenation and Desulfurization Studies with Raney-Nickel and Nickel Support Catalysts  
 Abstract    To characterize nickel catalysts the capability for the hydrogenation and desulfurization under standard conditions is investigated. Depending on the conditions for the preparation the catalysts are subdivided in four classes: Raney-nickel-type, two types of nickel support catalysts and nickel-Al 2 0 3 -borides. Table I shows the rates of the hydrogenation of sodium cinnamate and the values for the desulfurization of diphenylsulfide, carbondisulfide and sodiumthiosulfate. The values for the specific surface, for the volume of the pores and for the adsorption energies are determined (Table II). ESCA-measurements give an orienting impression on the composition of the surface of some selected catalysts (Table III). Table IV contains some analytical values for the nickel-Al 2 0 3 -borides. The capability for the magnetizability of some catalysts before and after the desulfurization is registrated qualitatively. 
  Reference    Z. Naturforsch. 40b, 826—832 (1985); eingegangen am 25. Februar 1985 
  Published    1985 
  Keywords    Raney-Nickel-Type Catalysts, Nickel Support Catalysts, ESCA Investigations, Magnetic Properties 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0826.pdf 
 Identifier    ZNB-1985-40b-0826 
 Volume    40 
10Author    Yuzo Nishida, Naoko Oshino, Tadashi TokiiRequires cookie*
 Title    Crystal Structure and Magnetic Property of the Binuclear Manganese(III) Complex with /u-Acetate and Di-ji-Alkoxo Bridges  
 Abstract    Binuclear manganese(III) complex, [Mn : L(u-OCH 3)0<-CH 3 COO)(OHCH : ,)]ClO 4 was pre-pared and characterized in terms of crystal structure determination, magnetic measurement, and ESR spectroscopy, where H 3 L represents the Schiff base derived from salicylaldehvde and 1,5-diamino-3-pentanol. 
  Reference    Z. Naturforsch. 43b, 472—474 (1988); received November 9/December 17 1987 
  Published    1988 
  Keywords    Binuclear Manganese(III) Complex, Crystal Structure, ESR Spectra, Magnetic Property 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0472.pdf 
 Identifier    ZNB-1988-43b-0472 
 Volume    43 
11Author    Z. NaturforschRequires cookie*
 Title    Structure and Magnetic Properties of a Dinuclear Complex with Iron(III) in Octahedral and Pyramidal Coordination  
 Abstract    [FeL(M eO H)C l]2 (L = N-(2-hydroxyphenyl)salicylaldimine) was synthesized and its crystal structure determ ined, [C27H 20N 2O5Cl2Fe2], monoclinic, space group P 2 a/c, a = 9.528(1), b = 7.684(1), c = 18.365(2) Ä , ß = 109.83(1)°, V = 1264.8 Ä 3, Z = 2. Two identical [FeL(M eOH)Cl] fragments, related by an inversion centre, are combined by the two bridging O atoms, to form a binuclear unit. The iron(III) centers are separated by 3.163(2) A and weakly antiferro-magnetically coupled (J = -8 .0 (1) cm -1), which follows from temperature -dependent mag­ netic susceptibility m easurements in the range 4.2 to 288 K. The effective magnetic moment per iron(III) is /ueff = 7.4 /uB at 288 K. 
  Reference    Z. Naturforsch. 49b, 1239—1242 (1994); received March 28 1994 
  Published    1994 
  Keywords    Dinuclear Iron(III) Complex, X-Ray, Structure, Magnetic Properties, Antiferromagnetic Coupling 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1239.pdf 
 Identifier    ZNB-1994-49b-1239 
 Volume    49 
12Author    Ayhan Elmalia, Yalcin Elerman3, Ingrid Svoboda, Hartmut Fuessb, Klaus Griesar0, Wolfgang HaasecRequires cookie*
 Title    Structure and Spin-Spin Interactions in a Linear Trinuclear Ni(II) Complex  
 Abstract    [Ni3(C2H302)2(C3H8N0)2L2] 1(L=N,N'-1,3-propyl-disalicylaldimine), (C2H30 2)=acetate, (C3H><NO)=hydroxymethyl-dimethylamine] has been synthesized and its crystal structure de­ termined, [C44H54N6OioNi3], triclinic, space group Pi, a = 9.560(1), b = 10.681(1), c = 12.200(1) A ,a = 112.17(1), ß = 101.25(1), 7 = 90.32(1)°, V = 1127.3 A \ Z = l.The molecule is linearly trinuclear with octahedral coordination of each nickel ion. The Ni-Ni distance is 3.048(1) A. Each nickel(II) atom is in an octahedral coordination. Magnetic susceptibility mea­ surements in the range 4.2 < T < 280 K have revealed antiferromagnetic coupling between adjacent Ni atoms (J\ = -2.2 cm-1) and between the terminal Ni atoms (/2 = -1 .7 cm-1). 
  Reference    Z. Naturforsch. 51b, 665—670 (1996); received October 20 1994 
  Published    1996 
  Keywords    X-Ray, Linear Trinuclear Nickel Complex, Magnetic Properties, Antiferromagnetic Coupling 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0665.pdf 
 Identifier    ZNB-1996-51b-0665 
 Volume    51 
13Author    Ayhan Elmali3, Yalcin Elermana, Ingrid Svobodab, Hartmut Fuessb, Klaus Griesar0, Wolfgang HaasecRequires cookie*
 Title    Structure and Magnetic Properties of a Dinuclear Copper(II) Complex  
 Abstract    [Cu2L] (L=N-2-hydroxy-4-methylphenyl-4-oxo-2-pentalketimine) was synthesized and its crystal structure determined. C24H?6Cu2N204 monoclinic space group P2|/n with a= 10.978(2), 17.045(3), c= 11.958(2) Ä, ß = 101.89(1)°, V = 2189.6(7) A3,Z = 4. Two copper(II) atoms in a distorted square-planar coordination are bridged by two oxygen atoms to form a dinuclear unit. The copperfll) centers are separated by 3.025(1) A and antiferro-magnetically coupled (7=-222.3 cm), which follows from temperature-dependent magnetic susceptibility measurements in the range 4.2 to 300 K. 
  Reference    Z. Naturforsch. 52b, 157—161 (1997); received September 30 1996 
  Published    1997 
  Keywords    Dinuclear Cu(II) Complex, X-Ray, Structure, Magnetic Properties, Antiferromagnetic Coupling 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0157.pdf 
 Identifier    ZNB-1997-52b-0157 
 Volume    52 
14Author    M. Sorescu, E. T. KnobbeRequires cookie*
 Title    Mössbauer Spectroscopy Evidence for Phase Selectivity in Excimer Laser Induced Amorphization of Thermally Annealed FeCoBSi Metallic Glass  
 Abstract    Pulsed excimer laser irradiation effects (/. = 308 nm, T = 10 ns, w = 3 J/cm 2 , N = 2 laser pulses/ spot, repetition rate 1 Hz) on the magnetic properties and phase composition of thermally annealed Fe 66 Co 18 B 15 Si 1 metallic glass have been studied by transmission and conversion electron Möss-bauer spectroscopy (CEMS). Radiation-driven surface modifications were examined by scanning electron microscopy (SEM). Excimer laser induced amorphization was observed in partially crystal-lized Fe 66 Co 18 B 15 Si 1 samples (7" A = 648 K, r A = 1 hour) and was found to be accompanied by the development of laser-induced magnetic anisotropy. In totally crystallized Fe^Co^B^Si! speci-mens (T A = 723 K, = 1 hour), the effect of excimer laser induced amorphization exhibited phase selectivity with respect to the crystalline components of the alloy system. When compared to bulk data, a different behavior of the surface magnetic texture and relative abundance of alloy phases was observed. The laser-induced phase transformation of thermally annealed Fe 66 Co 18 B 15 Si 1 specimens was shown to consist of partial amorphization and surface oxidation of the irradiated material. 
  Reference    Z. Naturforsch. 51a, 389—395 (1996); received February 3 1996 
  Published    1996 
  Keywords    Metallic glasses, Laser processing, Phase transformations, Magnetic properties, Möss-bauer spectroscopy 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0389.pdf 
 Identifier    ZNA-1996-51a-0389 
 Volume    51 
15Author    Wolfgang Jeitschko, Jörg Wallinda, MartinV. Dewalsky, Ulrich WortmannRequires cookie*
 Title    Preparation, Properties, and Structure of the Polyphosphides VM4P16, NbNi4P16, and WNi4P16  
 Abstract    The title compounds were prepared by reacting powders of the binary transition metal alloys with phosphorus in a tin melt. They crystallize with a monoclinic structure of space group C 2/c, which was determined from single-crystal X-ray data; VNi4P16: a = 1956.0(3), b = 565.9(1), c = 1106.6(2) pm, ß = 100.99(1)°, R -0.020 for 1904 structure factors and 97 variable parameters; NbNi4P16: a = 1973.0(3), b = 571.2(3), c = 1117.2(2) pm, ß = 100.74(1)°, R = 0.023 for 2431 F-values and 97 variables; WNi4P16: a = 1964.2(3), b = 568.3(2), c = 1109.3(2) pm,/? = 101.04(2)°, R = 0.031 for 371 F-values and 43 variables. The T atoms (T = V, Nb, W) have eight P neighbors, which form a slightly distorted square antiprism, and the Ni atoms have appro­ ximately octahedral P coordination. The P atoms form novel P8 units, which consist of 6 -mem-bered rings with a P2 side chain. Chemical bonding is discussed on the basis of classical two-electron bonds. A comparison of the interatomic distances suggests that the Fermi level cuts through a band formed by antibonding nickel-phosphorus states. A band structure is propos­ ed, which also rationalizes the metallic conductivity and the Pauli paramagnetism of the com­ pounds. 
  Reference    Z. Naturforsch. 48b, 1774—1780 (1993); received July 291993 
  Published    1993 
  Keywords    Crystal Structure, Magnetic Properties, Electrical Conductivity, Chemical Bonding, Transition Metal Polyphosphides 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1774.pdf 
 Identifier    ZNB-1993-48b-1774 
 Volume    48 
16Author    Ralf Czekalla, Wolfgang Jeitschko, Rolf-Dieter Hoffmann, Helmut RabeneckRequires cookie*
 Title    Preparation, Crystal Structure, and Properties of the Lanthanoid Carbides Ln4C7 with Ln = Ho, Er, Tm, and Lu  
 Abstract    The isotypic carbides Ln4C7 (Ln = Ho, Er, Tm, Lu) were prepared by arc-melting of the elemental components, followed by annealing at 1300 °C. The positions of the metal and of some carbon atoms of the monoclinic crystal structure of LU4C7 were determined from X-ray powder data, and the last carbon positions were found and refined from neutron powder diffraction data: P2,/c, a = 360.4(1), b = 1351.4(3), c = 629.0(2) pm, ß = 104.97(2)°, Z = 2, R = 0.026 for 429 structure factors and 15 positional parameters. The structure contains isolated carbon atoms with octahedral lutetium coordination and linear Cvunits, with C-C bond lengths of 132(1) and 135(1) pm. This carbide may therefore be considered as derived from methane and propadiene. The hydrolysis of LU4C7 with distilled water yields mainly methane and propine, while the hydrolyses of the corresponding holmium and erbium carbides resulted in relatively large amounts of saturated and unsaturated C2-hydrocarbons in addition to the expected products methane and propine. The structure comprises two-dimensionally infinite NaCl-type building elements, which are separated by the C3-units. It may be described as a stacking variant of a previously reported structure of H04C7, now designated as the a-modification. The Lu4C7-type /^-modification was obtained at higher temperatures. Its structure was refined by the Rietveld method from X-ray powder data to a residual R = 0.037 for 320 F values and 15 positional parameters. Lu4C7 is Pauli paramagnetic; /3-H04C7 and Er4C7 show Curie-Weiss behavior with magnetic ordering temperatures of less than 20 K. 
  Reference    Z. Naturforsch. 51b, 646—654 (1996); received August 28 1995 
  Published    1996 
  Keywords    Binary Lanthanoid Carbides, Magnetic Properties, Hydrolyses of Carbides, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0646.pdf 
 Identifier    ZNB-1996-51b-0646 
 Volume    51 
17Author    R. Pöttgen, K. H. Wachtmann, W. Jeitschko, A. Lang, T. EbelRequires cookie*
 Title    Er5Re2C7, Tm5Re2C7, and Lu5Re2C7 with Sc5Re2C7 Type, and Yb2ReC2 with Pr2ReC2 Type Structures  
 Abstract    ErsReiCy, TmsRe2C7, and LusReaC? were prepared by arc-melting of the elemental compo­ nents and subsequent annealing at 800 °C. ErsRe^Cy forms only after the annealing process, whereas the other two carbides were already present in the as cast samples. They crystallize with a ScsReiC? type structure, which was refined from single-crystal X-ray data of LusRe2C7: Cmmm, a = 791.44(5), b = 1418.08(8), c = 332.79(2) pm, Z = 2, R = 0.037 for 544 structure factors and 21 variable parameters. The structure contains linear centrosymmetric C3 units with a C-C bond length of 133(2) pm and isolated carbon atoms in octahedral coordination of four lutetium and two rhenium atoms. The rhenium atoms within the two-dimensionally infinite polymeric sheets [ReiC-tln are electronically saturated as is indicated by the diamagnetism and the semiconductivity of this carbide. Yf>2ReC2 was prepared by reacting the elements in a sealed tantalum tube with a high-frequency furnace. It crystallizes with a Pr2ReC2 type structure: Pnma, a = 645.91(6), b = 498.64(6), and c = 966.05(6) pm. Magnetic susceptibility measurements indicate the ytterbium atoms to be trivalent in this compound. 
  Reference    Z. Naturforsch. 52b, 231—236 (1997); received November 15 1996 
  Published    1997 
  Keywords    Crystal Structure, Magnetic Properties, Rare Earth Metal Rhenium Carbides, Polymeric Rhenium-Carbon Polyanions 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0231.pdf 
 Identifier    ZNB-1997-52b-0231 
 Volume    52