Effect of Li Addition to the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System. (I).

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  • Ohara Taigen
    Research Institute for Production Development
  • Endo Kazuyo
    Department of Applied Chemistry, Faculty of Engineering, Okayama University
  • Egi Toshio
    Department of Applied Chemistry, Faculty of Engineering, Okayama University
  • Nanba Tokuro
    Department of Applied Chemistry, Faculty of Engineering, Okayama University
  • Takada Jun
    Department of Applied Chemistry, Faculty of Engineering, Okayama University
  • Ikeda Yasunori
    Institute for Chemical Research, Kyoto University
  • Takano Mikio
    Institute for Chemical Research, Kyoto University
  • Bando Yoshichika
    Institute for Chemical Research, Kyoto University
  • Mazaki Hiromasa
    Department of Mathematics and Physics, National Defense Academy

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Other Title
  • Ｂｉ‐Ｐｂ‐Ｓｒ‐Ｃａ‐Ｃｕ‐Ｏ系高温相へのＬｉ添加効果　（第Ｉ報）
  • Bi Pb Sr Ca Cu Oケイ コウオンソウ エ ノ Li テンカ コウ

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Abstract

Effects of the Li-addition to the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system have been studied for samples with starting compositions of Bi:Pb:Sr:Ca:Cu:Li=0.9:0.2:1.0:1.0:1.6:x with x=0-0.10 and heated at 820-850°C for 40-96h. The temperature, at which an endothermic reaction occurred, lowered markedly as x increased. Tc was raised up to 116K for the sample with x=0.03 heated at 840°C for 48h, while a susceptibility measurement revealed that Tc=110K. The lattice constants, a and c, were independent of Li content. ICP analysis showed that the heat treated samples had very low Li content. The results suggest that a small amount of the high-Tc phase with Tc=116K forms on the surface of the high-Tc phase with Tc=110K.

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