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1998 (1)
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1Author    Mohamed Yalpani, WernerE. KlotzbücherRequires cookie*
 Title    Transformations in Thin Solid Layers: The Reversible Polymerization-Depolymerization of 2,6-Di-n-propyl- l,3>5,7-tetraoxa-2,6-dibora-4,8-octalindiones at Low Temperatures  
 Abstract    The course of Aggregation of molecules of the title compound (lb) through different, spectro-scopically discernible and chemically identifiable forms of associations could be followed by matrix isolation and thin film infrared and UV-visible spectroscopy. It was found that molecules of lb in thin films form clusters which at low temperatures interact weakly, probably through the carbonyl oxygens of one and the boron atoms of the neighbouring molecules. On warming to 260 K this association gradually takes the form of more defined chelate bonds, probably with ordered three-dimensional intermolecular structures. Above this temperature spontaneous for-mation of crystallites of the previously reported 'hot' and 'cold' modifications was observed. Studies with films of varying thickness indicate an interdependence of crystallite size and lattice energies. 
  Reference    Z. Naturforsch. 40b, 222—228 (1985); received September 24 1984 
  Published    1985 
  Keywords    Solid State Reaction, Matrix Isolation, Aggregation, Phase Transformation, Microcrystals 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0222.pdf 
 Identifier    ZNB-1985-40b-0222 
 Volume    40 
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    EvgeniiA. RomanenkoRequires cookie*
 Title    Phase Transformation and Structure of N-chlorocarbonylisocyanide Dichloride  
 Abstract    The 35 C1 nuclear quadrupole resonances in N-chlorocarbonylisocyanide dichloride show that it exists in two polymorphic forms. The metastable a phase has six 3 ~ Cl NQR lines and the stable ß phase has three. The latter is obtained irreversibly by annealing the a phase at 179 K. The temperature depen-dences of the 35 C1 NQR frequencies, spin-lattice and spin-spin relaxation times are obtained in both phases. The results of the 35 C1 NQR studies are discussed together with calculated MNDO level data and other physical properties (IR frequencies, dipole moments) of this compound. 
  Reference    Z. Naturforsch. 53a, 546—548 (1998); received May 4 1998 
  Published    1998 
  Keywords    N-Chlorocarbonylisocyanide Dichloride, Structure, Phase Transformation, 35 C1 NQR Parameters, MNDO calculation 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0546.pdf 
 Identifier    ZNA-1998-53a-0546 
 Volume    53