Large irreversibility field in nanoscale C-doped MgB2/Fe tape conductors

Yanwei Ma; Xianping Zhang; S. Awaji; Dongliang Wang; Zhaoshun Gao; G. Nishijima; K. Watanabe

doi:10.1088/0953-2048/20/3/L01

Large irreversibility field in nanoscale C-doped MgB₂/Fe tape conductors

Yanwei Ma, Xianping Zhang, S. Awaji, Dongliang Wang, Zhaoshun Gao, G. Nishijima, K. Watanabe

High Field Laboratory for Superconducting Materials

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

24 Citations (Scopus)

Abstract

We investigated the effect of nanoscale C doping on the critical current density J_c and irreversibility field B_irr of Fe-sheathed MgB₂ tapes prepared by the in situ powder-in-tube method. The tapes were heat treated at 600-950 °C for 1h. Higher values of J_c and B_irr were seen for 5at.% C-doped MgB₂ tapes at higher sintering temperatures. The C-doped samples sintered at 950 °C showed the highest B_irr, for example at 4.2K the B_irr reached 22.9T. In particular, at 20K, B_irr for the C-doped tape achieved 9T, which is comparable to the upper critical field of the commercial NbTi at 4.2K. This role of nanosized C particles can be very beneficial in the fabrication of MgB₂ tapes for magnetic resonance imaging applications at 20K.

Original language	English
Article number	L01
Pages (from-to)	L5-L8
Journal	Superconductor Science and Technology
Volume	20
Issue number	3
DOIs	https://doi.org/10.1088/0953-2048/20/3/L01
Publication status	Published - 2007 Mar 1

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1088/0953-2048/20/3/L01

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abstract = "We investigated the effect of nanoscale C doping on the critical current density Jc and irreversibility field Birr of Fe-sheathed MgB2 tapes prepared by the in situ powder-in-tube method. The tapes were heat treated at 600-950 °C for 1h. Higher values of Jc and Birr were seen for 5at.% C-doped MgB2 tapes at higher sintering temperatures. The C-doped samples sintered at 950 °C showed the highest Birr, for example at 4.2K the Birr reached 22.9T. In particular, at 20K, Birr for the C-doped tape achieved 9T, which is comparable to the upper critical field of the commercial NbTi at 4.2K. This role of nanosized C particles can be very beneficial in the fabrication of MgB2 tapes for magnetic resonance imaging applications at 20K.",

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AU - Ma, Yanwei

AU - Zhang, Xianping

AU - Awaji, S.

AU - Wang, Dongliang

AU - Gao, Zhaoshun

AU - Nishijima, G.

AU - Watanabe, K.

PY - 2007/3/1

Y1 - 2007/3/1

N2 - We investigated the effect of nanoscale C doping on the critical current density Jc and irreversibility field Birr of Fe-sheathed MgB2 tapes prepared by the in situ powder-in-tube method. The tapes were heat treated at 600-950 °C for 1h. Higher values of Jc and Birr were seen for 5at.% C-doped MgB2 tapes at higher sintering temperatures. The C-doped samples sintered at 950 °C showed the highest Birr, for example at 4.2K the Birr reached 22.9T. In particular, at 20K, Birr for the C-doped tape achieved 9T, which is comparable to the upper critical field of the commercial NbTi at 4.2K. This role of nanosized C particles can be very beneficial in the fabrication of MgB2 tapes for magnetic resonance imaging applications at 20K.

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Large irreversibility field in nanoscale C-doped MgB₂/Fe tape conductors

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