Microscopic role of carbon on MgB2 wire for critical current density comparable to NbTi
SCIE
SCOPUS
- Title
- Microscopic role of carbon on MgB2 wire for critical current density comparable to NbTi
- Authors
- Kim, JH; Oh, S; HEO, YOON UK; Hata, S; Kumakura, H; Matsumoto, A; Mitsuhara, M; Choi, S; Shimada, Y; Maeda, M; MacManus-Driscoll, JL; Dou, SX
- Date Issued
- 2012-01
- Publisher
- Nature Publishing Group
- Abstract
- Increasing dissipation-free supercurrent has been the primary issue for practical application of superconducting wires. For magnesium diboride, MgB2, carbon is known to be the most effective dopant to enhance high-field properties. However, the critical role of carbon remains elusive, and also low-field critical current density has not been improved. Here, we have undertaken malic acid doping of MgB2 and find that the microscopic origin for the enhancement of high-field properties is due to boron vacancies and associated stacking faults, as observed by high-resolution transmission electron microscopy and electron energy loss spectroscopy. The carbon from the malic acid almost uniformly encapsulates boron, preventing boron agglomeration and reducing porosity, as observed by three-dimensional X-ray tomography. The critical current density either exceeds or matches that of niobium titanium at 4.2 K. Our findings provide atomic-level insights, which could pave the way to further enhancement of the critical current density of MgB2 up to the theoretical limit. NPG Asia Materials (2012) 4, e3; doi:10.1038/am.2012.3; published online 18 January 2012
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/106939
- DOI
- 10.1038/am.2012.3
- ISSN
- 1884-4049
- Article Type
- Article
- Citation
- NPG Asia Materials, vol. 4, 2012-01
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