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1993 (1)
1Author    ElenaL. Belokoneva, VladimirG. Tsirel 'sonRequires cookie*
 Title    Electron Density and Bonding in Ring Silicates: Beryl, Cordierite, Dioptase  
 Abstract    The electron density and bonding in the silicates beryl, cordierite and dioptase has been investi-gated. The replacement of Be, Si and Al atoms in the identical structural fragments leads to a (^-redistribution and changes the cr-bond character from slightly polar to strongly polar. The condensation of [SiOJ-tetrahedra in the rings leads to the accumulation of electron density near bridge oxygens. This phenomenon is expressed especially in dioptase (pure ring silicate). Therefore, the electron density picture may be considered as a supplementary independent criterion for classi-fication of crystal structures. The experimental (5@-maps for H 2 0 molecules in dioptase are in good agreement with theoretical ones. The ^^-distribution of 3 d-electrons and bonding in the Jahn-Teller distorted Cu-octahedron can be interpreted from crystal-field-theory point of view. 
  Reference    Z. Naturforsch. 48a, 41—46 (1993); received January 10 1992 
  Published    1993 
  Keywords    Electron density, Bonding, Ring silicates 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0041.pdf 
 Identifier    ZNA-1993-48a-0041 
 Volume    48