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Jc increase of BPSCCO-2223 bulk by composing with Ag wires

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8 Author(s)
Hishinuma, Y. ; Adv. Mater. R&D Center, Meisei Univ., Tokyo, Japan ; Yamamoto, R. ; Hirano, S. ; Yoshizawa, Shuji
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To improve the superconducting properties of the high-Tc superconductors, we prepared the (Bi,Pb)2Sr2Ca2Cu3Oy (BPSCCO-2223) bulk composite with embedded Ag wires. The composites were hand-made by stacking alternately Ag wires into the oxide powder in the thickness direction, and then the prepared samples sintered at 840°C for 50 hours. SEM and EPMA observation showed that good c-axis oriented and densely structured BPSCCO-2223 plate-like grains could be formed around the interfacial region between BPSCCO-2223 oxide and metal Ag wire. We measured critical current density (Jc ) performance at 77.3 K and self-field and/or 4.2 K under several magnetic fields. As the Jc values of the BPSCCO-2223/Ag wires composite bulks were higher than that of BPSCCO-2223 bulk without Ag wires, Jc values were improved with increasing the number of Ag wires at several measurement conditions. The maximum Jc was obtained about 230 A/cm2 at 77.3 K and self-field, 800 A/cm2 at 4.2 K and self-field when forty-two Ag wires were composed. These Jc values corresponded to about twice that of BPSCCO-2223 oxide bulk without Ag wire. The improvement of Jc value was brought about by forming good c-axis oriented and densely structured BPSCCO-2223 plate-like grains

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Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )