Hollow carbon spheres as an efficient dopant for enhancing critical current density of MgB2 based tapes

Details Hollow carbon spheres as an efficient dopant for enhancing critical current density of MgB2 based tapes Hollow carbon spheres as an efficient dopant for enhancing critical current density of MgB2 based tapes

2008-02-26

arxiv.org/abs/0802.3732v2

Supercond. Sci. Technol. 21 (2008) 105020

Physics

Condensed Matter

Superconductivity

14 pages, 5 figures

Scientific paper

10.1088/0953-2048/21/10/105020

A significant enhancement of Jc and Hirr in MgB2 tapes has been achieved by the in situ powder-in-tube method utilizing hollow carbon spheres (HCS) as dopants. At 4.2 K, the transport Jc for the 850C sintered samples reached 3.1x10^4, and 1.4x10^4 A/cm^2 at 10 and 12 T, respectively, and were better than those of optimal nano-SiC doped tapes. Furthermore, the Hirr for doped sample was raised up to 16.8 T at 10 K due to the carbon substitution effect. The results demonstrate that HCS is one of the most promising dopants besides nano-carbon and SiC for the enhancement of current capacity for MgB2 in high fields.

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