Current Transport Mechanism and Control of the n-Value for Ag/Bi2212 Wires and Tapes

被引：1

作者：

Awaji, Satoshi ^{[1
]}

Inoue, Takushi ^{[1
]}

Takahashi, Ken-ichiro ^{[2
]}

Badica, Petre ^{[3
]}

Nishijima, Gen ^{[1
]}

Watanabe, Kazuo ^{[1
]}

机构：

[1] Tohoku Univ, High Field Lab Superconducting Mat, IMR, Aoba Ku, Sendai, Miyagi 9808577, Japan

[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[3] Natl Inst Mat Phys, Magurele 077125, Ilfov, Romania

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2009年 / 19卷 / 03期

关键词：

Bi2212 tape and wires; critical current density; high magnetic field; in-field heat-treatment; n-value; HIGH MAGNETIC-FIELDS; LOW-TEMPERATURE; MODEL;

D O I：

10.1109/TASC.2009.2018211

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In order to study the mechanism of the small n-value for Bi2212, E - J characteristics were measured carefully for various kinds of Bi2212 tapes and round wires in high magnetic fields. Some of wires were heat-treated in a magnetic field of 5 T. We found that the n-values of all the samples increase by the in-field heat-treatment at 5 T. In addition, we analyzed the E - J properties by the combination of the percolation model based on the local J(c) distribution and the two directional J(c) distribution model. The improvement of the n-value by the in-field heat treatment can be understood by the change of the aspect-ratio of the grains. Therefore, the aspect-ratio of the grains plays an important role in the current transport influencing not only J(c) but also n-value.

引用

页码：3071 / 3075

页数：5

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