Phthalocyanine doping to improve critical current densities in MgB 2 tapes

Xianping Zhang, Yanwei Ma, Dongliang Wang, Zhaoshun Gao, Lei Wang, Yanpeng Qi, Satoshi Awaji, Kazuo Watanabe, Eric Mossang

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Phthalocyanine-doped MgB2 tapes were prepared by the insitu powder-in-tube method. The relationships between the critical current properties, crystallinity and microstructure were studied as a function of the phthalocyanine doping level. It is found that both Hirr and H c2 were improved when MgB2 samples were doped with phthalocyanine, which are mainly attributed to the effective carbon substitution and enhanced flux pinning strength caused by very fine grain sizes. Furthermore, compared to pure samples, the MgO content remained almost unchanged in all doped tapes, which is very beneficial to having better grain connectivity in MgB2. Significantly improved Jc was obtained in the phthalocyanine-doped MgB2 tapes, especially under high magnetic fields.

Original languageEnglish
Article number045019
JournalSuperconductor Science and Technology
Volume22
Issue number4
DOIs
Publication statusPublished - 2009 Jul 24

ASJC Scopus subject areas

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

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