Effect of C Doping Level and the Ratio of Mg to B on the MgB2 Wires Fabricated by Internal Mg Diffusion Method

Dongliang Wang; Chao Yao; Xianping Zhang; Yanchang Zhu; Yanwei Ma; Fang Liu; Huajun Liu; Satoshi Awaji

doi:10.1109/TASC.2019.2900417

Effect of C Doping Level and the Ratio of Mg to B on the MgB₂ Wires Fabricated by Internal Mg Diffusion Method

Dongliang Wang, Chao Yao, Xianping Zhang, Yanchang Zhu, Yanwei Ma, Fang Liu, Huajun Liu, Satoshi Awaji

High Field Laboratory for Superconducting Materials

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

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 J_c 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 J_c data can be achieved after further optimization of the B particle size, the wire diameter, and the ratio of Mg to B.

Original language	English
Article number	8643834
Journal	IEEE Transactions on Applied Superconductivity
Volume	29
Issue number	5
DOIs	https://doi.org/10.1109/TASC.2019.2900417
Publication status	Published - 2019 Aug

Keywords

MgB wires
carbon dopant
crystalline boron powder
internal Mg diffusion
transport properties

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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Effect of C Doping Level and the Ratio of Mg to B on the MgB₂ Wires Fabricated by Internal Mg Diffusion Method. / Wang, Dongliang; Yao, Chao; Zhang, Xianping; Zhu, Yanchang; Ma, Yanwei; Liu, Fang; Liu, Huajun; Awaji, Satoshi.

In: IEEE Transactions on Applied Superconductivity, Vol. 29, No. 5, 8643834, 08.2019.

Research output: Contribution to journal › Article › peer-review

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title = "Effect of C Doping Level and the Ratio of Mg to B on the MgB2 Wires Fabricated by Internal Mg Diffusion Method",

abstract = "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.",

keywords = "MgB wires, carbon dopant, crystalline boron powder, internal Mg diffusion, transport properties",

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AU - Wang, Dongliang

AU - Yao, Chao

AU - Zhang, Xianping

AU - Zhu, Yanchang

AU - Ma, Yanwei

AU - Liu, Fang

AU - Liu, Huajun

AU - Awaji, Satoshi

PY - 2019/8

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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.

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