TITLE:
Electrical, Structural and Morphological Properties of Sb-Doped Bi-Based Superconductors
AUTHORS:
Ghazala Y. Hermiz, Amal K. Jassim, Saad F. Oboudi
KEYWORDS:
(Bi, Pb) Superconductors, Sb Substitution, Sintering Time
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.5 No.6,
June
26,
2015
ABSTRACT: In this paper,
samples of antimony doped Bi-based superconductor with stoichiometric composition
Bi1.7Pb0.2Sb0.1Sr2Ca2Ca3O10 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-Tc phase (2212) in addition to
an impure phase. It has been observed that the critical temperature and the
high-Tc 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 Tc 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 Tc.