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1993 (1)
1978 (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    Harald Schäfer, Marita TrenkelRequires cookie*
 Title    Synthese und chemischer Transport ternärer Verbindungen, untersucht am Beispiel CoO + Nb205 = CoNb206 Synthesis and Chemical Transport of Ternary Compounds, Investigated with CoO + Nb205 = CoNb206  
 Abstract    Chemical transport reactions (1273 -> 1073 K) with CoO, Nb205 or CoNb206 using TeCl4 as transport agent have been made. The experimental results are compared with thermo-dynamic calculations. General rules for the treatment of chemical transport calculations concerning ternary compounds are given. 
  Reference    Z. Naturforsch. 33b, 1318—1320 (1978); eingegangen am 22. Juni 1978 
  Published    1978 
  Keywords    Chemical Transport, Ternary Compounds, Cobalt Oxide, Niobium Oxide, Cobalt Niobate 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1318.pdf 
 Identifier    ZNB-1978-33b-1318 
 Volume    33