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'Magnetic Properties' in keywords Facet   Publication Year 1996  [X]
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Publication Year
1996[X]
1Author    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 
2Author    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 
3Author    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