J(c) increase of BPSCCO-2223 bulk by composing with Ag wires

To improve the superconducting properties of the high-T-c superconductors, we prepared the (Bi,Pb)(2)Sr2Ca2Cu3Oy (BPSCCO-2223) bulk composite with emb edded Ag wires, The composites were hand-made by stacking alternately Ag wi res into the oxide powder in the thickness direction, and then the prepared samples sintered at 840 degreesC for 50 hours. SEM and EPMA observation sh owed that good c-axis oriented and densely structured BPSCCO-2223 plate-lik e grains could be formed around the interfacial region between BPSCCO-2223 oxide and metal Ag wire. We measured critical current density (J(c)) perfor mance at 77.3K and self-field and/or 4.2K under several magnetic fields, As the J(c) values of the BPSCCO-2223/Ag wires composite bulks were higher th an that of BPSCCO-2223 bulk without Ag wires, J(c) values were improved wit h increasing the number of Ag wires at several measurement conditions, The maximum J(c) was obtained about 230A/cm(2) at 77.3K and self-field, 800A/cm (2) at 4.2K and self-field when forty-two Ag wires were composed, These J(c ) values corresponded to about twice that of BPSCCO-2223 oxide bulk without Ag wire. The improvement of J(c) value was brought about by forming good c -axis oriented and densely structured BPSCCO-2223 plate-like grains.