Critical Current Properties of c-Axis Oriented Bi(Pb)2223 Bulks Sintered under High Gas Pressures
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- 作者：K. Obata ; J. Shimoyama ; A. Yamamoto ; H. Ogino ; K. Kishio ; S. Kobayashi ; K. Hayashi
- 关键词：High tempepature superconductor ; Bi2223 bulk ; High Jc ; Over pressure sintering ; Magnetic grain alignment technique
- 刊名：Physics Procedia
- 出版年：2012
- 出版时间：2012
- 年：2012
- 卷：36
- 期：Complete
- 页码：665-668
- 全文大小：921 K
文摘
Enhancement of Jc 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 Jc 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 Jc than randomly oriented bulks. The observed Jc of 2.3 x 104 Acm-2 (20 K, 1 kOe) was very high value as for Bi(Pb)2223 sintered bulks.