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'Tellurium Oxide' in keywords Facet   Publication Year 1997  [X]
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1997[X]
1Author    B. W. Edel, HkM. Üller-B, UschbaumRequires cookie*
 Title    Über die Kristallstrukturen der Tellurate Pb3Fe2Te20 12 und Pb2CoTe06  
 Abstract    Pb3Fe2Te20 |2 (I) and Pb2C oT e06 (II) have been prepared by crystallization from melts. Single crystal X-ray investigations led to monoclinic (I) and tetragonal (II) symmetry, space groups Cs-Cc and D{J-I4/mmm. Lattice constants I: a = 9.866(3), b = 15.332(4), c = 7.172(2) A, ß = 111.34(3)°, Z = 4. II: a = 5.661(5), c = 8.004(7) A, Z = 2. (I) represents a new crystal structure, characterized by a network of octahedra occupied by Fe + and Te6+ in a disordered manner. The centres of negative charge of the lone pairs of Pb2+ in I are estimated by Coulomb term calculations. II belongs to the elpasolithe type. 
  Reference    (Z. Naturforsch. 52b, 35—39 [1997]; eingegangen am 2. September 1996) 
  Published    1997 
  Keywords    Lead, Iron, Cobalt, Tellurium Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0035.pdf 
 Identifier    ZNB-1997-52b-0035 
 Volume    52 
2Author    Hk Wulff, Müller-BuschbaumRequires cookie*
 Title    Planare C u 0 4-Polygone und eine einseitig offene Te4+0 3-Koordination in SrCuTe20 6 Planar C u 0 4 Polygons and a One-Sided Open Te4+0 3 Coordination in SrCuTe-,06 L  
 Abstract    The new compound SrCuTe20 6 has been prepared by quenching single crystals grown from a flux of SrC 03, T e02 and C uC 03 C u(0H)2. X-ray investigations show cubic symmetry, space group 0 7-P4| 32, lattice constant a = 12.473(1), Z = 12. The crystal structure is characterized by square planar C u 0 4 polygons and a one-sided open triangular oxygen coordination of Te4+, both incorporated in a Sr/O network. The one sided oxygen coordination of tellurium is completed by the lone pair of Te4+. Calculations of the Coulomb parts of lattice energy led to the position of the lone pair centre. 
  Reference    Z. Naturforsch. 52b, 1341—1344 (1997); eingegangen am 26. August 1997 
  Published    1997 
  Keywords    Strontium, Copper, Tellurium Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1341.pdf 
 Identifier    ZNB-1997-52b-1341 
 Volume    52