Microstructure and J_c property on the Bi-2223 bulk prepared by inserting Ag layers

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• 作者：Hishinuma ; Yoshimitsu ; Nemoto ; Shoji ; Yoshizawa ; Shuji
• 关键词：74.72.H ; 74.60.J ; 81.10.A ; Bi-2223 bulk ; Oxide/Ag composite ; Multi-layer ; Stacking Ag layer ; Interface of oxide ; Grain alignment ; J_c value
• 刊名：Physica C
• 出版年：2001
• 出版时间：April 15, 2001
• 年：2001
• 卷：351
• 期：4
• 页码：409-414
• 全文大小：153 K

文摘

The microstructure and critical current density (J_c) property of (Bi,Pb)₂Sr₂Ca₂Cu₃O_y (Bi-2223)/Ag multi-layered bulks were investigated. They were prepared by stacking Ag sheets alternately into the oxide, and then sintered at 840°C for 10–50 h. From the XRD and SEM results, high c-axis alignment and dense structure of Bi-2223 plate-like grains were observed near the region of the interface between Bi-2223 layer and Ag sheet, and the other regions in the oxide were random and porous structures. Further, we measured J_c value using the four-probe method at 77 K and self-field. J_c values of the multi-layered bulk were improved in proportion to increasing the number of Ag sheets and the maximum J_c is estimated to be 320 A/cm² in the sample with four Ag sheets. We thought that improvement of J_c performance was caused by highly c-axis aligned and densely structured region formed by Ag sheets.