Effect of Additive Alkaline Earth Metal Oxides on Critical Current Donsity of Superconductors in the Bi (Pb)-Sr-Ca-Cu-O System

Setsuo Yada, Ryoichi Yamamoto, Shigeharu Naka, Yasunori Ikeda, Mikio Takano, Jun Takada, Hideaki Itoh

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Abstract

The sintering behavior and superconducting properties of the high Tc phase in the Bi(Pb)-Sr-Ca-Cu-O system were investigated using the starting powder with a composition Bi1. 8Pbo. 4Sr2. o-Ca2. oCu3.2Oy which was added to by 0.10mol or 0. 15mol of MgO, CaO, SrO and BaO each, then press-formed at 2000kg/cm or 5000kg/cm and sintered at 850°C. or 860°C: for 120hr. The influence of the CaO additive was examined in detail in the range of x=0.0−0.7 for Bi1.8Pbo. 4Sr2. oCa2. o+xCu3. 2Oy. Bulk densities of 4.8-4.9g/cm were obtained in the oxide added systems that were press-formed at 5000kg/am and sintered at 850°C, while Tc was nearly constant at 107-111K. Jc measured at 77K exceeded 500A/cm for both the MgO and CaO added systems. With increasing additive content (x) the bulk density of the above CaO additive system decreased from 4.8 to 4.1g/cm at 850°C and from 4.7 to 4.3g/cm at 860°C. Tc(zero resistance) increased with increasing x, suggesting that the amount of the coexisting low Tc phase was decreased. The Jc(77K) value increased with x and attained a maximum of 1100A/cm at x=0.4 sintered at 850°C and at x=0.6 sintered at 860°C, 4-5 times higher than that of x=0.0.

Original languageEnglish
Pages (from-to)1048-1052
Number of pages5
JournalJournal of the Japan Society of Powder and Powder Metallurgy
Volume38
Issue number8
DOIs
Publication statusPublished - Jan 1 1991

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ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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