Grain Connectivity of MgB2 Tapes Fabricated by the PIT Method

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  • MATSUMOTO Akiyoshi
    National Institute for Materials Science
  • YAMADA Hideyuki
    Maglev System Development Division, Central Japan Railway Company Graduate School of Pure and Applied Sciences,University of Tsukuba
  • IGARASHI Motohiro
    Maglev System Development Division, Central Japan Railway Company
  • KITAGUCHI Hitoshi
    National Institute for Materials Science
  • KUMAKURA Hiroaki
    National Institute for Materials Science Graduate School of Pure and Applied Sciences,University of Tsukuba

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Other Title
  • ＭｇＢ２超伝導体の臨界電流特性および材料化の現状と展望　　種々のＰＩＴ‐ＭｇＢ２線材における結晶粒間結合性
  • 種々のPIT-MgB2線材における結晶粒間結合性
  • シュジュ ノ PIT MgB2 センザイ ニ オケル ケッショウ リュウカン ケツゴウセイ

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Abstract

The grain connectivity calculated using resistivity measurements has been investigated using in-situ PIT-processed tapes. The effective current area (1/F) of the tapes, in cases where commercial Mg powder was used, was only 4.3%. On the other hand, 1/F values of tapes using MgH2 and nano-Mg powders were larger than those using Mg powder. 1/F values of C-doped tapes decreased with increasing amounts of C in cases where MgH2 powder was used. Simultaneous addition of 3-ethyltoluene and SiC were effective in preventing the suppression of connectivity, because the packing density was increased using 3-ethyltoluene.

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