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'Superconductor' in keywords Facet   Publication Year 1993  [X]
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1Author    P. Ghigna, G. Chiodelli, U. Anselmi-Tamburini, G. Spinolo, G. FlorRequires cookie*
 Title    Homogeneity Range, Hole Concentration, and Electrical Properties of the Bi 2 Sr3_ x Ca x Cu 2 0 8+3 ,(l ^ x g 2) Superconductors  
 Abstract    The homogeneity range of Bi-Sr-Ca-Cu oxides with two-layers ("2212") structure has been investigated with X-ray powder diffraction and electron microprobe determination on materials with nominal Bi 2 Sr 3 _ Jt Ca x Cu 2 0 8+) , (x = 1-h2 in 0.1 steps) composition and being prepared at two different oxygen partial pressures. The results show Bi over-stoichiometry and a wide range of Sr/Ca substitution. DC resistivity measurements indicate that the hole concentration is controlled by both oxygen non-stoichiometry and cation molecularity. It is shown that a single phenomenological relation between hole concentration and electrical properties can explain in a consistent way the complex behaviour of the whole set of materials with different oxygen non-stoichiometry and cation molec-ularity. 
  Reference    Z. Naturforsch. 48a, 1214—1218 (1993); received October 26 1993 
  Published    1993 
  Keywords    Bi 2 Sr 2 CaCu 2 O s, Superconductors, Oxygen non-stoichiometry, Cation molecularity 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-1214.pdf 
 Identifier    ZNA-1993-48a-1214 
 Volume    48