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.
Highlights
Among high-Tc superconductors, Bi-2223 compound with the superconducting critical temperature Tc ≈ 110 K is one of the promising candidates for practical applications, such as power transmission cables, flexible wire or tape carrying high density of current at liquid nitrogen temperature [1] [2]
It has been reported that Pb doping at Bi-sites promotes the formation of single Bi-2223 phase and leads to higher Tc values by inducing a partially melted liquid phase, which eases the diffusion of elements that improve the connectivity between regions of the 2223 structure, and promotes the formation of a Bi-2223 nearly single-phase sample
The results of Bi1.7Pb0.2Sb0.1Sr2Ca2Ca3O10 samples sintered for different periods of time (80, 100, 120, 140, and 160) h indicate that all samples have an orthorhombic structure with two phases; high-Tc phase (2223) and low-Tc phase (2212), in addition to a small amount of impurity phases of Sr2Ca2Cu7O in all samples at 2θ = 36.8 ̊ [17]
Summary
Among high-Tc superconductors, Bi-2223 compound with the superconducting critical temperature Tc ≈ 110 K is one of the promising candidates for practical applications, such as power transmission cables, flexible wire or tape carrying high density of current at liquid nitrogen temperature [1] [2]. (2015) Electrical, Structural and Morphological Properties of Sb-Doped Bi-Based Superconductors. It has been reported that Pb doping at Bi-sites promotes the formation of single Bi-2223 phase and leads to higher Tc values by inducing a partially melted liquid phase, which eases the diffusion of elements that improve the connectivity between regions of the 2223 structure, and promotes the formation of a Bi-2223 nearly single-phase sample. It increases their critical current density [5] [6]
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