Influence of Nb diffusion layer on superconductivity of MgB2/Nb/Cu wires

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机构：
[1] [1,2,3,Wang, Qingyang
[2] 1,Zhang, Pingxiang
[3] Yan, Guo
[4] 3,Sulpice, A.
[5] Xiong, Xiaomei
[6] Yang, Fang
[7] Liu, Guoqing
[8] Jiao, Gaofeng
[9] Li, Chengshan
来源：
Li, C. (MgB2@QQ.com) | 1600年 / Science Press卷 / 42期
关键词：
Diffusion barriers - Niobium compounds - Magnesium compounds - Heat treatment - Wire - Copper compounds;
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摘要：
The MgB2 wires were prepared by in-situ Powder-in-Tube (PIT) method with Nb/Cu compounds tube as the sheath and then were heat treated at various temperatures for 2 h in flowing argon. The resistivity (R-T), magnetic moment (M-T), transport critical current (Ic-B) and magneto optical (MO) properties of MgB2 wires were analyzed. The results show that there is a diffusion layer between MgB2 superconducting core and Nb barrier layer when the heat-treatment temperature is higher than 750°C, and this diffusion layer obstructs the current transfer into MgB2 superconductor core from the Cu sheath. This indicates that the best heat-treatment temperature for the MgB2 wires with Nb as the barrier layer should be lower than 750°C. Copyright © 2013 Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.
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