Abstract
MgO nanopowders with average size 20 and 40 nm were introduced into (Bi1.6Pb0.4Sr2Ca2Cu3O10)(MgO)x(x=0–0.15 wt.%) in the pellet form. The optimum amounts for the highest transport critical current densityJcwerex=0.10and 0.01 wt.% for 20 and 40 nm MgO, respectively. These results were used to fabricate MgO added (Bi, Pb)-2223/Ag sheathed tapes using the powder-in-tube method. The tapes were sintered at 845°C for 50 h and 100 h. The structure, microstructure, andJcof the tapes were determined. The temperature and magnetic field dependence ofJcfor the MgO added tapes exhibited a significant enhancement compared with the nonadded tapes.Jcof 20 nm MgO added tape was higher compared with the 40 nm MgO added tape. A higherJcwas obtained when the tapes were sintered for 100 h. The increase inJccan be explained as the increase of the flux pinning strength by nanosized MgO. The nanoparticle with size closer to the coherence length was more effective in enhancingJc.
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