TY - JOUR
T1 - Effect of C Doping Level and the Ratio of Mg to B on the MgB2 Wires Fabricated by Internal Mg Diffusion Method
AU - Wang, Dongliang
AU - Yao, Chao
AU - Zhang, Xianping
AU - Zhu, Yanchang
AU - Ma, Yanwei
AU - Liu, Fang
AU - Liu, Huajun
AU - Awaji, Satoshi
N1 - Funding Information:
Manuscript received October 25, 2018; accepted February 11, 2019. Date of publication February 19, 2019; date of current version March 14, 2019. This work was supported in part by the National Natural Science Foundation of China under Grants 51577182 and 51721005 and in part by the Beijing Municipal Natural Science Foundation under Grant 3182039. (Corresponding author: Yanwei Ma.) D. Wang, C. Yao, X. Zhang, Y. Zhu, and Y. Ma are with the Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China (e-mail:, ywma@mail. iee.ac.cn).
Funding Information:
This work was supported in part by the National Natural Science Foundation of China under Grants 51577182 and 51721005 and in part by the Beijing Municipal Natural Science Foundation under Grant 3182039.
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2019/8
Y1 - 2019/8
N2 - Monofilament MgB2/Fe wires were fabricated by using internal Mg diffusion (IMD) process with ball milled crystalline boron powder. In this paper, the effect of C doping level and the ratio of Mg to B on these IMD-processed MgB2 wires were investigated. It was found that the highest transport Jc value was 6.2 × 104 A/cm2 at 4.2 K and 10 T, when the carbon concentration was 4% and the ratio of Mg to B was 1:1.57. The microstructure results showed that a number of B-rich particles still remained in MgB2 reacted layer, though B powder was ground by ball milling. Besides, there is residual Mg in the center of the MgB2 wires because of the large wire diameter. The analysis of these results indicates that higher Jc data can be achieved after further optimization of the B particle size, the wire diameter, and the ratio of Mg to B.
AB - Monofilament MgB2/Fe wires were fabricated by using internal Mg diffusion (IMD) process with ball milled crystalline boron powder. In this paper, the effect of C doping level and the ratio of Mg to B on these IMD-processed MgB2 wires were investigated. It was found that the highest transport Jc value was 6.2 × 104 A/cm2 at 4.2 K and 10 T, when the carbon concentration was 4% and the ratio of Mg to B was 1:1.57. The microstructure results showed that a number of B-rich particles still remained in MgB2 reacted layer, though B powder was ground by ball milling. Besides, there is residual Mg in the center of the MgB2 wires because of the large wire diameter. The analysis of these results indicates that higher Jc data can be achieved after further optimization of the B particle size, the wire diameter, and the ratio of Mg to B.
KW - MgB wires
KW - carbon dopant
KW - crystalline boron powder
KW - internal Mg diffusion
KW - transport properties
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U2 - 10.1109/TASC.2019.2900417
DO - 10.1109/TASC.2019.2900417
M3 - Article
AN - SCOPUS:85063570231
VL - 29
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 5
M1 - 8643834
ER -