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'Sodium Selenogermanate IV' in keywords
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1985 (1)
1Author    KurtO. KleppRequires cookie*
 Title    Darstellung und Kristallstruktur von Na4GeSe4: Ein neues orr/io-Selenogermanat(IV) Preparation and Crystal Structure of Na4GeSe4: A New 0 rt/20-Selen0 germ anate(IV )  
 Abstract    Na4GeSe4 was obtained from a stoichiometric melt of Na2Se, Ge and Se at 750 °C. It crystallizes with a new orthorhombic structure, space group Pnma, with a = 28.518(8), b — 9.447(5), c = 7.128(2) Ä , Z = 8 . The crystal structure was refined to a conventional R of 0.074 for 1236 reflections with I > 3 a (I) (diffractometer data). It is characterized by discrete GeSe44"-anions with almost regular tetrahedral geometry. Two independent anions appear in the structure, the mean Ge — Se-bond lengths are 2.345 and 2.353 Ä, resp. The Na+-ions are coordinated to 4 —6 chalco-gen atoms in the range 2.88—3.28 Ä. The structure is composed of mixed cation-anion-slabs, 2 [Na2(G eSe4)2_], which run parallel to the bc-plane and are separated from each other by corrugated 36-layers of N a+-ions. 
  Reference    Z. Naturforsch. 40b, 878 (1985); eingegangen am 25. März 1985 
  Published    1985 
  Keywords    Sodium Selenogermanate(IV), Preparation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0878.pdf 
 Identifier    ZNB-1985-40b-0878 
 Volume    40