Abstract
Abstract Enhancement of J c performance of Bi(Pb)2223 bulks was attempted by sintering under controlled over pressures (CT-OP) and c -axis grain orientation. Relative density of bulks increased up to 93% with an increase of total gas pressure during the sintering. In addition, improvement of grain coupling by CT-OP sintering was indicated from normal state resistivity. Reflecting these facts, the bulks sintered by the CT-OP method showed higher J c than the bulks sintered under ambient pressure. On the other hand, magnetic grain alignment technique was adopted to achieve c -axis grain orientation. The c -axis oriented bulks showed higher J c than randomly oriented bulks. The observed J c of 2.3 x 104 Acm-2 (20 K, 1 kOe) was very high value as for Bi(Pb)2223 sintered bulks.
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