J. Mater. Sci. Technol.

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Synthesis and Characterization of Tl-1223 Substituted by Scandium

R. Awad1), A. Al-Zein2,3), M. Roumie4), I.H. Ibrahim1,3)   

  1. 1) Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt
    2) Laboratoire Structures, Propriétes et Modélisation des Solides (SPMS), CNRS-UMR8580, Ecole Centrale Paris, 92295 Chatenay-Malabry, France
    3) Physics Department, Faculty of Science, Beirut Arab University, Beirut, Lebanon
    4) Accelerator Laboratory, Lebanese Atomic Energy Commission, CNRS, Beirut, Lebanon
  • Received:2011-05-23 Revised:2011-12-10 Online:2013-11-30 Published:2013-11-06
  • Contact: A. Al-Zein

Abstract:

X-ray powder diffraction, scanning electron microscopy (SEM), energy dispersive X-ray, electrical resistivity and AC-magnetic susceptibility measurements have been performed for polycrystalline superconducting samples of type TlBa2Ca2xScxCu3O9δ (0.0 ≤ x ≤ 0.6). The powder X-ray diffractograms indicate that the tetragonal structure of Tl-1223 is not affected by Sc-substitution whereas the lattice parameters are changed. The X-ray analysis indicates that the low-contents of scandium (x) enhance the formation of Tl-1223 and reduce the secondary phases. The grain-size determined by SEM decreases as x increases. The electrical resistivity measurements show suppression in the superconducting transition temperature, Tc, and an increase in both the residual resistivity and the superconducting transition width as x increases. The suppression in Tc is attributed to the hole-filling mechanism.

Key words: X-ray diffraction, Resistivity, Superconducting transition temperature, AC magnetic susceptibility