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1993 (1)
1979 (1)
1Author    C. H. Rüscher, M. Zimmermann, M. GötteRequires cookie*
 Title    Investigations of the Anisotropic Optical Reflectivity of Binary and Ternary Nb-W Oxides Possessing Block-Type Crystal Structure  
 Abstract    We have studied the anisotropic optical properties of binary Nb0 2 5 _ a (0 < Ö < 0.083) and ternary Nb 18 _ £ W 8+£ 0 6? (e = 0,1,..., 9) compounds using the polarized regular-reflection method. We observed strong anisotropic behaviour for all reduced phases. The anisotropic effect can be related to the crystallographical structure principle and to the doping of charge carriers by the reduction of oxygen (<5) or substitution of W for Nb (e) in the binary and ternary oxides, respectively. Our results indicate that the charge carriers are confined to the structural block units. For increasing 3 and e, metal-like properties occur (<5 > 0.1, e > 8) in the infinite block direction only. 
  Reference    Z. Naturforsch. 48a, 443—446 (1993); received December 31 1991 
  Published    1993 
  Keywords    Optical reflectivity, Block-type crystal structure, Niobium oxide, Niobium tungsten oxide 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0443.pdf 
 Identifier    ZNA-1993-48a-0443 
 Volume    48 
2Author    Günter Heurung, Reginald GruehnRequires cookie*
 Title    Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen, IX a Elektronenmikroskopische Untersuchungen an Kristallen aus Transportexperimenten -System Nb205-W03 (I) Contributions to the Study of Inorganic Non-Stoichiometric Compounds, IX a Electron Microscopical Investigations on Crystals Prepared by Chemical Transport in the System Nb205-W03 (I)  
 Abstract    Compounds near the composition Nb205: WO3 ~ 6:1 were prepared by chemical trans-port (at relatively low temperatures). The block structures of the obtained samples were investigated by high resolution electron microscopy. Besides unusual defects microdomains were found which still contain edgesharing blocks even at the composition 0/27Me = 2.53 to 2.55. 
  Reference    Z. Naturforsch. 34b, 1377—1384 (1979); eingegangen am 18. Juni 1979 
  Published    1979 
  Keywords    Block Structures, Defect Structures, High Resolution Electron Microscopy, Niobium Tungsten Oxides, Chemical Transport 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1377.pdf 
 Identifier    ZNB-1979-34b-1377 
 Volume    34