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2001 (1)
2000 (1)
1Author    Constantin Hoch, Caroline RöhrRequires cookie*
 Title    Neue Oxogermanate(IV) der schweren Alkalimetalle. Synthesen und Kristallstrukturen New Oxogermanates(IV) of the Heavy Alkaline Metals. Preparation and Crystal Structure  
 Abstract    The new germanates(IV) were synthesized via reaction of GeC>2 with AO2 (A=K, Rb, Cs) and the elemental alkaline metals and their crystal structures have been determined from single crystal X-ray data. ß-K^GeOi / Rh+GeC^ (monoclinic, P 2 \/c , a = 1047.6(3)/1103.2(2), b = 646.5(1)/673.3(1), c = 1048.1(3)/1084.5(2) pm, ß = 112.291(5) / 112.676(4)°, Z = 4) and CsioGe209 (monoclinic, P 2 \/c , a = 1293.7(2), b = 1148.6(2), c = 1926.4(2) pm, ß = 128.05(8)°, Z = 4) contain isolated, AöGe309 (A = Rb / Cs: monoclinic, P 2 \/c , a = 663.0(1) / 696.3(2), b = 1346.8(2) / 1403.1(3), c = 1666.6(2) / 1742.8(6) pm, ß = 107.47(2) / 107.88(2)°, Z = 2) cyclotrigermanate ions. In Cs3AlGe207 (monoclinic, C 2/c, a = 961.5(2), b = 1719.7(2), c = 761.7(1) pm, ß =126.5(1)°, Z = 4) digermanate ions are connected via [AIO4 ] tetrahedra to form ribbons. 
  Reference    Z. Naturforsch. 56b, 1245—1256 (2001); eingegangen am 30. August 2001 
  Published    2001 
  Keywords    Germanates, Oxogermanates, Alumogermanates 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-1245.pdf 
 Identifier    ZNB-2001-56b-1245 
 Volume    56 
2Author    G. Concas, F. Congiu, G. Spano, A. Speghini, K. Gatterer, M. H. BartlRequires cookie*
 Title    Hyperfine Interactions at Lanthanide Sites in Europium Doped Oxide Glasses  
 Abstract    A series of europium doped Na 2 0-B 2 0 3 -Si0 2 , Pb0-Ge0 2 and Zn0-Te0 2 glasses was investi-gated by means of 5l Eu Mössbauer spectroscopy. The distortion of the Eu sites has been evaluated in the Na 2 0-B 2 0 3 -Si0 2 glasses by means of the quadrupolar interaction parameter and the asym-metry parameter; the disorder has been estimated by the line width. The occupancy of the sites in the borosilicate glasses is discussed. The correlation of the isomer shift with the optical basicity of the glass is discussed in terms of the degree of covalence of the Eu-0 bond. 
  Reference    Z. Naturforsch. 55a, 499—506 (2000); received December 14 1999 
  Published    2000 
  Keywords    Europium, Oxide Glasses, Borosilicates, Germanates, 15 'Eu Mössbauer Spectroscopy 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0499.pdf 
 Identifier    ZNA-2000-55a-0499 
 Volume    55