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

Autor:	Dongliang Wang, Xianping Zhang, Yanwei Ma, Yanchang Zhu, Satoshi Awaji, Chao Yao, Fang Liu, Huajun Liu
Rok vydání:	2019
Předmět:	Materials science Doping Analytical chemistry chemistry.chemical_element Condensed Matter Physics Microstructure 01 natural sciences Electronic Optical and Magnetic Materials chemistry 0103 physical sciences Particle size Electrical and Electronic Engineering 010306 general physics Boron Ball mill
Zdroj:	IEEE Transactions on Applied Superconductivity. 29:1-5
ISSN:	2378-7074 1051-8223
DOI:	10.1109/tasc.2019.2900417
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::65ba61ad4d49aca0f352ec67ef2fb02a https://doi.org/10.1109/tasc.2019.2900417 Zobrazit plný text záznamu