Czechoslovak Journal of Physics

, Volume 46, Supplement 3, pp 1415–1416 | Cite as

Structural refinements on high-Tc superconductor Tl0.5Pb0.5Sr2−xBaxCa2Cu3O9−δ

  • Roman E. Gladyshevskii
  • Philippe Galez
  • Kheirreddine Lebbou
  • Emilio Bellingeri
  • Michel Couach
  • René Flüklger
  • Jean-Louis Jorda
  • Marie Thérèse Cohen-Adad
HTS—Synthesis, Substitution Studies, Film Preparation

Abstract

Samples of nominal composition Tl0.5Pb0.5Sr2−xBaxCa2Cu3O9−δ with 0≤x≤0.6 were characterized by structural refinements on X-ray powder diffraction data. The weight fraction of the 1223 phase ranged from 85% (x=0) to 91% (x=0.4); 1212 phase, (Ca, Sr)2PbO4, (Ca, Sr)2CuO3 and BaPbO3 being detected in small quantities. The refined Ba content in the 1223 phase corresponded to the nominal compositions and the cell parameters increased with increasing x. The distance between the Cu atom and the apical O atom of the square pyramid increased from 2.29 to 2.50 Å as the Ba content was raised. A displacement (up to 0.26 Å) of the Tl atoms from the ideal position on the 4-fold axis was observed for all samples. Structural refinements on neutron diffraction data indicated related displacement of the O atoms in the TlO layer. Tc was not significantly affected by the changes in composition and structure and ranged from 118 K (x=0) to 116 K (x=0.6).

Keywords

Perovskite Weight Fraction Nominal Composition Structural Refinement Neutron Diffraction Data 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

  1. [1]
    D.H. Kimet al., Physica C177 (1991) 431.CrossRefADSGoogle Scholar
  2. [2]
    M. Paranthamanet al., Physica C219 (1994) 413.CrossRefADSGoogle Scholar
  3. [3]
    R.S. Luiet al., Physica C222 (1994) 278.CrossRefADSGoogle Scholar
  4. [4]
    M.A. Subramanianet al., Science242 (1988) 249.CrossRefADSGoogle Scholar
  5. [5]
    M.A.G. Arandaet al., Physica C221 (1994) 304.CrossRefADSGoogle Scholar
  6. [6]
    K. Lebbouet al., to be published.Google Scholar
  7. [7]
    R.E. Gladyshevskiiet al., Physica C, submitted.Google Scholar
  8. [8]
    B. Morosinet al., Physica C183 (1991) 90.CrossRefADSGoogle Scholar
  9. [9]
    C. Martinet al., Physica C201 (1992) 362.CrossRefADSGoogle Scholar

Copyright information

© Institute of Physics, Acad. Sci. CR 1996

Authors and Affiliations

  • Roman E. Gladyshevskii
    • 1
  • Philippe Galez
    • 2
  • Kheirreddine Lebbou
    • 3
  • Emilio Bellingeri
    • 1
  • Michel Couach
    • 4
  • René Flüklger
    • 1
  • Jean-Louis Jorda
    • 2
  • Marie Thérèse Cohen-Adad
    • 3
  1. 1.Département de Physique de la Matière CondenséeUniversité de GenèveGenève 4Switzerland
  2. 2.Laboratoire Structure de la MatièreUniversité de SavoieAnnecy-le-Vieux CedexFrance
  3. 3.Laboratoire Physicochimie Minéral IIUniversité Claude BernardVilleurbanne CedexFrance
  4. 4.Laboratoire de CryophysiqueC.E.N.-Grenoble SPSMSGrenoble Cedex 9France

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