Fabrication of Bi2223 bulks with high critical current properties sintered in Ag tubes

被引：6
|
作者：
Takeda, Yasuaki [1 ]
Shimoyama, Jun-ichi [2 ]
Motoki, Takanori [2 ]
Kishio, Kohji [1 ]
Nakashima, Takayoshi [3 ]
Kagiyama, Tomohiro [3 ]
Kobayashi, Shin-ichi [3 ]
Hayashi, Kazuhiko [3 ]
机构：
[1] Univ Tokyo, Dept Appl Chem, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan
[2] Aoyama Gakuin Univ, Dept Math & Phys, Chuo Ku, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 2525258, Japan
[3] Sumitomo Elect Ind Ltd, Konohana Ku, 1-1-3 Shimaya, Osaka 5540024, Japan
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2017年 / 534卷
关键词：
High-temperature superconductors (HTS); Bi2223; Critical current density; CRITICAL-CURRENT-DENSITY; CA-CU-O; SINGLE-PHASE; SUPERCONDUCTORS; IMPROVEMENT; OXIDE; (BI;
D O I：
10.1016/j.physc.2016.12.005
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Randomly grain oriented Bi2223 sintered bulks are one of the representative superconducting materials having weak-link problem due to very short coherence length particularly along the c-axis, resulting in poor intergrain Jc properties. In our previous studies, sintering and/or post-annealing under moderately reducing atmospheres were found to be effective for improving grain coupling in Bi2223 Sintered bulks. Further optimizations of the synthesis process for Bi2223 sintered bulks were attempted in the present study to enhance their intergrain A. Effects of applied pressure of uniaxial pressing and sintering conditions on microstructure and superconducting properties have been systematically investigated. The best sample showed intergrain Jc of 2.0 kA cm(-2) at 77 K and 8.2 kA cm(-2) at 20K, while its relative density was low similar to 65%. These values are quite high as for a randomly oriented sintered bulk of cuprate superconductors. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：9 / 12
页数：4
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