Applied Magnetic Field vs Critical Current Density Characteristics of Superconducting Nb-60Ti-5Zr Alloy Sheets

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  • Nb-60Ti-5Zr超電導合金板の磁場―臨界電流密度特性について
  • Nb-60Ti-5Zr チョウデンドウゴウキンバン ノ ジバ-リンカイ デンリュウ ミツド トクセイ ニ ツイテ

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Applied magnetic field (H)-critical current density (Jc) characteristics of rolled Nb-60Ti-5Zr sheets aged at 300°∼500°C were measured at 4.2°K in order to examine the anisotropic effect. The results are as follows:<BR>(1) The most suitable heat treatment to increase the magnitude of Jc of the sheets is ageing at 300° or 350°C for at least about 500 or 100 hr, respectively. For the sheets aged at 350°C for 125 hr, the critical current densities Jc(\varparallel) and Jc(⊥), which correspond to the rolled planes parallel and perpendicular to the direction of an applied magnetic field, are determined as 1.1×105 and 5.8×104 A/cm2 at 70 kOe and 3.7×104 and 1.8×104 A/cm2 at 90 kOe, respectively.<BR>(2) In case of ageing at 400°∼500°C, the anisotropic effect of H-Jc characteristics (the ratio of Jc(\varparallel) to Jc(⊥)) increases with increasing ageing temperature.<BR>(3) The peak effect is observed in the H-Jc(⊥) characteristics of the sheets and depends upon the ageing temperature and time, while it is not shown in the H-Jc(\varparallel) characteristics.

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