Abstract
The superconducting phase (Tl0.8 Hg0.2−x Sb x ) Ba2Ca2Cu3O9−δ , with 0.0 ≤x≤0.2, was characterized by means of X-ray powder diffraction (XRD), scanning electron microscope (SEM), proton induced X-ray emission (PIXE), Rutherford backscattering spectrometry (RBS), electrical resistivity (ρ) and transport critical current density (J ct). The tetragonal structure of (Tl, Hg)-1223 remains unchanged with antimony-substitution, whereas the lattice parameters were changed. The actual elemental-content of Tl, Hg, Sb, Ba, Ca and Cu, determined from PIXE, were very close to those of the nominal elemental-content. The oxygen-stoichiometry of the prepared samples was determined by non-Rutherford backscattering cross section at 3 MeV H+. A little increase in the oxygen stoichiometry was observed as Sb-content increased. The superconducting transition temperature T c, determined from electrical resistivity, increased from 124.8 K to 131.5 K as x increased from 0.0 to 0.1 and then it decreased with the further increase in x. The same behavior is obtained for J ct vs. x. This indicates that the optimal Sb-substitution in (Tl, Hg)-1223 is at about x=0.1.
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Abou-Aly, A.I., Mohammed, N.H., Roumié, M. et al. Ion Beam Analysis and Physical Properties Measurements of (Tl0.8Hg0.2−x Sb x )Ba2Ca2Cu3O9−δ . J Supercond Nov Magn 22, 495–504 (2009). https://doi.org/10.1007/s10948-009-0447-z
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DOI: https://doi.org/10.1007/s10948-009-0447-z