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1997 (1)
1990 (1)
1Author    Masahiko Suhara, Koichi ManoRequires cookie*
 Title    NQR and Phase Transitions in Hexachlorocyclopropane Crystal  
 Abstract    35 C1 NQR and DSC studies on phase transitions in hexachlorocyclopropane (HCCP), C 3 C1 6 , are reported. It is found that HCCP has three solid phases: A high temperature disordered phase (Phase I) above 301 K (no NQR spectrum was observed); a metastable phase (Phase II), which exhibited 6 NQR lines from 77 to 270 K; a low temperature phase (Phase III) in which a 24-multiplet of 35 C1 NQR lines at 77 K, the most complex multiplet spectrum ever reported was observed. DSC measurement shows a A-type transition at 301 K and a broad transition of very slow rate at 285 K. The structure and mechanism of phase transitions in HCCP crystal are discussed. 
  Reference    Z. Naturforsch. 45a, 339—342 (1990); received August 23 1989 
  Published    1990 
  Keywords    Nuclear quadrupole resonance, Phase transition, Crystal structure, Differential scan-ning calonmetry, Order-disorder transition 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0339.pdf 
 Identifier    ZNA-1990-45a-0339 
 Volume    45 
2Author    Veit MarxRequires cookie*
 Title    Ein neues Verfahren zur numerischen Berechnung des Madelung-Anteils der Gitterenergie ionischer Kristalle A New Method for the Numerical Calculation o f the Madelung Contribution o f the Lattice Energy in Ionic Crystals  
 Abstract    The Madelung contribution to the lattice energy of simple binary crystal structures and lanthanide oxide fluorides with different types of disorder has been calculated by summation of Coulomb interactions and additional consideration of surface effects. In the case o f NaCl, CsCl, ZnS and CaF2 the agreement with mathematically exactly calculated values is better than 1 %. For the cubic high temperature modification of YOF it could be shown that a structure with long range order and short range disorder is more favourable from the energetic point o f view than a stochastic distribution of the anions over all anion sites of the crystal. 
  Reference    Z. Naturforsch. 52b, 895—900 (1997); eingegangen am 3. April 1997 
  Published    1997 
  Keywords    Madelung Energy, Order-Disorder Transition, Lanthanide Oxide Fluoride, Configurational Entropy, Random Polyeder 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0895.pdf 
 Identifier    ZNB-1997-52b-0895 
 Volume    52