Enhancement of Phase Formation and Critical Current Density in (Bi,Pb)-2223 Superconductor by Boron Addition and Ball Milling
DOI:
https://doi.org/10.15379/2408-977X.2016.01Keywords:
(Bi,Pb)-2223 phase, Crystalline boron additive, Ball milling, Electrical resistivity, Critical temperature, Critical current densityAbstract
The effects of crystalline boron addition and ball milling on the phase formation and transport properties of (Bi,Pb)-2223 HTS have been studied. Samples with nominal composition Bi1.7Pb0.3Sr2Ca2Cu3BxOy, x=0 - 0.5, were prepared via a solid state reaction route. Superconducting properties of undoped (reference) and boron-added (Bi,Pb)-2223 compounds were investigated through X-ray diffraction (XRD), scanning electron microscopy (SEM), resistivity and transport critical current density (Jc) measurements. Obtained results have shown that boron additive leads to the acceleration of high-Tc phase formation and enhancement of Jc in (Bi,Pb)-2223 superconductor. The estimated volume fraction of (Bi,Pb)-2223 phase increases from ~25 % for reference specimen to ~75 % for x=0.15. Moreover, strong increase in the Jc was observed for the x=0.15 sample (Jc=340 A/cm2), compared to a reference sample (Jc=115 A/cm2). We have studied the effect of high-energy ball milling on Jc in reference and x=0.15 samples. Addition of B in combination with the ball milling leads to the further enhancement of Jc up to 490 A/cm2, whereas the ball milling of reference specimen causes the marked decrease in both Jc and Tc values. Improvement of superconducting properties in (Bi,Pb)-2223 superconductor can be attributed to the acceleration of high-Tc phase formation along with the enhancement of intergrain coupling due to the elemental boron addition.
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