Author(s)

Ghazala Y. Hermiz, Amal K. Jassim, Saad F. Oboudi

Department of Physics, College of Science, University of Baghdad, Baghdad, Iraq.

In this paper, samples of antimony doped Bi-based superconductor with stoichiometric composition Bi_1.7Pb_0.2Sb_0.1Sr₂Ca₂Ca₃O₁₀ were prepared by a solid state reaction method. The effect of sintering time on the superconducting properties was studied; all samples were sintered in air at 850°C for different sintering time (80, 100, 120, 140, and 160) h. X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements were performed for determination of the crystal structure and surface morphology of samples, respectively. All samples showed an orthorhombic structure with two phases, high-Tc phase (2223) and low-T_c phase (2212) in addition to an impure phase. It has been observed that the critical temperature and the high-T_c phase increases and appears to be the dominant phase when the sintering time is increased to 140 h, while with increasing sintering time to 160 h, both T_c and the high phase started to decrease. (SEM) results show that increasing sintering time enhances the growing of superconducting phase unidirectional and suppresses the high phase intrusion which leads to the production of nearly single Bi-2223 phase with higher T_c.

(Bi, Pb) Superconductors, Sb Substitution, Sintering Time

Hermiz, G. , Jassim, A. and Oboudi, S. (2015) Electrical, Structural and Morphological Properties of Sb-Doped Bi-Based Superconductors. Advances in Materials Physics and Chemistry, 5, 214-220. doi: 10.4236/ampc.2015.56022.