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

Zhaoshun Gao; Yanwei Ma; Xianping Zhang; Dongliang Wang; Junhong Wang; K. Watanabe; Boyang Liu

doi:10.1088/0953-2048/21/10/105020

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

Superconductivity 2009-11-13 v2

Authors: Zhaoshun Gao , Yanwei Ma , Xianping Zhang , Dongliang Wang , Junhong Wang , K. Watanabe , Boyang Liu

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Abstract

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.

Keywords

hollow carbon spheres mgb2 tapes critical current density upper irreversibility field powder-in-tube method carbon substitution

Cite

@article{arxiv.0802.3732,
  title  = {Hollow carbon spheres as an efficient dopant for enhancing critical current density of MgB2 based tapes},
  author = {Zhaoshun Gao and Yanwei Ma and Xianping Zhang and Dongliang Wang and Junhong Wang and K. Watanabe and Boyang Liu},
  journal= {arXiv preprint arXiv:0802.3732},
  year   = {2009}
}

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14 pages, 5 figures

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

Abstract

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