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'System Nb20s W03 Nb02F' in keywords Facet   Publication Year 1976  [X]
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1Author    Eberhard Krämer, Reginald GruehnRequires cookie*
 Title    Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen, VI* Präparative und strukturelle Untersuchung von WNb15O40F und nahe benachbarten Defektstrukturen im System Nb205-W03-Nb02F Contributions to the Study of Inorganic Non-Stoichiometrie Compounds, VI* Preparative and Structural Investigations of WNb15O40F and Closely Related Defect Structures in the System Nb205-W03-Nb02F  
 Abstract    In the quaternary system H-Nb20s-W03-Nb02F the phase WNbi504oF was prepared in form of light-yellow needles. The compound crystallizes in the monoclinic system with the unit cell dimensions a = 22.254 A, b = 3.829 A, c = 20.298 A and ß= 114.29°, space group C 2. Electron optical investigations showed the crystal structure containing 5 x 3 x co-blocks of Nb-(0, F)-octahedra, with metal atoms in tetrahedral positions located at the junctions of every four blocks. X-ray investigations showed a range of homogeneity between (O, F)/(W, Nb) = 2.556 <2.563 (WNbi5O40F) <2.571. The hypothetical phase WNbis047F2 with 6 x 3-blocks was found as a microdomain by electron microscopy. 
  Reference    (Z. Naturforsch. 31b, 1569—1573 [1976]; eingegangen am 2. September 1976) 
  Published    1976 
  Keywords    System Nb20s-W03-Nb02F, Crystal Structures, Defect Structures, High Resolution Electron Microscopy 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1569.pdf 
 Identifier    ZNB-1976-31b-1569 
 Volume    31