Enhancement of grain connectivity and critical current density in the ex-situ sintered MgB2 superconductors by doping minor Cu

被引：17

作者：

Cheng, Fang ^{[1
]}

Ma, Zongqing ^{[1
]}

Liu, Chenxi ^{[1
]}

Li, Huijun ^{[1
]}

Hossain, Md. Shahriar A. ^{[2
,3
]}

Bando, Yoshio ^{[2
,3
]}

Yamauchi, Yusuke ^{[2
,3
]}

Fatehmulla, Amanullah ^{[4
]}

Farooq, W. Aslam ^{[4
]}

Liu, Yongchang ^{[1
]}

机构：

[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin Key Lab Composite & Funct Mat, Tianjin 300072, Peoples R China

[2] Univ Wollongong, AIIM, Sq Way, North Wollongong, NSW 2500, Australia

[3] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitechton MANA, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan

[4] King Saud Univ, Coll Sci, Dept Phys & Astron, Riyadh 11451, Saudi Arabia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 727卷

基金：

澳大利亚研究理事会; 中国国家自然科学基金;

关键词：

Cu addition; Ex-situ sintering; Grain connectivity; Critical current density; REDUCTION; CARBON;

D O I：

10.1016/j.jallcom.2017.08.152

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of Cu addition on the microstructure and superconducting performance of ex-situ sintered MgB2 is systemically studied. It is found that the critical current density (J(c)) of the Cu-doped sample is improved compared to the un-doped samples. In particular, the J(c) of the Cu-doped sample sintered at 900 degrees C for only 10 min is the best value at low fields. The reason is that Cu addition can obviously promote the decomposition of MgB2 <-> MgB2 + Mg, which produces more Mg that can then react with Cu, forming local Mg-Cu liquid at high temperature. The presence of this local Mg-Cu liquid can significantly enhance the migration and self-sintering of MgB2, leading to the significant improvement in the grain connectivity and J(c). Our results indicate that Cu addition is a promising method to fabricate high-performance ex-situ MgB2 bulks and wires. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：1105 / 1109

页数：5

共 36 条

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