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1992 (1)
1989 (1)
1Author    S. Sh, A. Soulayman, HarfoushRequires cookie*
 Title     
 Abstract    a lc u la tio n o f th e M e ltin g C u rv e s o f s o m e A lk a li-h a lid e s w ith C s C l S tr u c tu r e a n d th e ir T h e r m o d y n a m ic P r o p e r tie s a lo n g th e s e C u rv e s The paper presents a study of three semi-empirical laws of melting. The study utilises the Im­ proved Unsymmetrized Self-Consistent Field Method (IUSCFM) for strongly anharmonic crystals with complex lattice and the energy criterion in calculating the melting curves of some alkali-halides. The energy criterion was proven correct along the melting curves particularly in the case of CsCl type of structure. The calculations of the melting curves for crystals of nine alkali-halides (KCl, KBr, KI, RbCl, RbBr, Rbl, CsCl, CsBr, Csl) are presented. The thermodynamic properties of these salts along the curves are also determined. A comparison of the calculated results and the experimental data is included. 
  Reference    Z. Naturforsch. 44a, 513—518 (1989); received October 27 1988 
  Published    1989 
  Keywords    Melting curves, Alkali-halides, Thermodynamic properties, Energy criterion, CsCl structure 
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 TEI-XML for    default:Reihe_A/44/ZNA-1989-44a-0513.pdf 
 Identifier    ZNA-1989-44a-0513 
 Volume    44 
2Author    S. Sh, SoulaymanRequires cookie*
 Title    Theoretical Melting Curves of Alkali Halides  
 Abstract    An analysis of the melting curves of alkali halides is given. The study is based on the Improved Unsymmetrized Self-Consistent Field Method (IUSCFM) for strongly anharmonic crystals with complex lattice and the energy, entropy and Ross's criterions in calculating the melting curves of alkali halides. The anharmonicities up to sixth order have been taken into consideration. The energy criterion was proven to be the most correct one along the melting curves of the high pressure modification (CsCl structure) while the entropy and Ross's criterions lead to a little better agreement with experiment than the energy criterion when dealing with rocksalt structure. Calculations of the melting curves of KCl and CsCl are compared with the experimental results. 
  Reference    Z. Naturforsch. 47a, 753—760 (1992); received January 20 1992 
  Published    1992 
  Keywords    Alkali halides, Melting curves, Energy criterion, Entropy criterion, Ross's criterion 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0753.pdf 
 Identifier    ZNA-1992-47a-0753 
 Volume    47