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1993 (1)
1984 (1)
1Author    S. Sh, Soulayman, C. Ch, Ch Marti, Ch, GuilpinRequires cookie*
 Title    Anharmonic Self-Consistent Theory of Crystals. I. A 1 d Quartic Crystal Model  
 Abstract    We apply the Unsymmetrized Self-Consistent-Field-Method (USCFM) to a linear infinite chain of identical atoms with a quartic pair interaction potential. We show that an exact solution of the USCFM can be found in terms of a single auxiliary function which is studied here in details. We use it to calculate the partition function, the energy and the free energy, the moments of the position, the corrections due to quantum effects and higher terms of the potential, the specific heat and the thermal expansion. An anharmonic approximative approach, based on the self-consistent potential of the used method, is developed also. We apply these two approaches to the study of the thermo-elastic properties of a one dimensional system (krypton). It is demonstrated that the approximate approach is very effective when dealing with pairwise potentials of positive second derivative. The Lennard-Jones potential is used in our calculations. 
  Reference    Z. Naturforsch. 48a, 1182—1192 (1993); received December 18 1992 
  Published    1993 
  Keywords    Linear chain, Anharmonicity, Thermodynamic properties, Inert gases 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-1182.pdf 
 Identifier    ZNA-1993-48a-1182 
 Volume    48 
2Author    Mario Cannas, Giaime Marongiu, HeimoJ. Keller, Barbara Müller, Reinhold MartinRequires cookie*
 Title    Structure of the Linear-Chain Mixed Valence Compound Bis(l,3-diaminopropane)platinum(II)bis(l,3-diaminopropane)- diiodoplatinum(IV)tetraperchlorate  
 Abstract    The title compound CpH49Cl4LN80 16Pt-,, Mr 1314.1, is monoclinic P 2, (from structural analy­ sis), a = 8.74(1), b = 11.36(1), c = 8.63(1), ß = 107.6(5), V = 817 Ä 3, Z = 1, D m (flotation) = 2.65 g cm-3, D c = 2.66 g cm-3, MoKa A = 0.71069, /u = 110.7 cm-1, R = 0.063 for 1068 observed reflections. Rotation photographs show diffuse patterns corresponding to odd values of k together with weak Bragg reflections. Refinement of diffractometer data was carried out in space groups Pm, P2,/m and P2,; both refinement in Pm and P2, give satisfactory agreement and lead to very similar crystal structures. 
  Reference    Z. Naturforsch. 39b, 197 (1984); eingegangen am 5. September 1983 
  Published    1984 
  Keywords    Linear Chain, Mixed-Valence Platinum(II, IV) Compound 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0197.pdf 
 Identifier    ZNB-1984-39b-0197 
 Volume    39