Effect of additive alkaline earth metal oxides on critical current donsity of superconductors in the Bi (Pb)-Sr-Ca-Cu-O systems

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 Bi1.8Pb0.4Sr2.0Ca2.0Cu3.2Oy which was added to by 0.10mol or 0.15mol of MgO, CaO, SrO and BaO each, then pressformed 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 approximately 0.7 for Bi1.8Pb0.4Sr2.0Ca3.0+xCu3.2Oy. Bulk densities of 4.8 approximately 4.9g/cm were obtained in the oxide added systems that were press-formed at 5000kg/cm and sintered at 850°C, while Tc was nearly constant at 107 approximately 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 approximately 5 times higher than that of x=0.0.

Original languageEnglish
Pages (from-to)1048-1052
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume38
Issue number8
Publication statusPublished - Nov 1991
Externally publishedYes

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Alkaline Earth Metals
Alkaline earth metals
Critical currents
Powders
Oxides
Superconducting materials
Sintering
Chemical analysis

ASJC Scopus subject areas

  • Mechanical Engineering
  • Metals and Alloys

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Effect of additive alkaline earth metal oxides on critical current donsity of superconductors in the Bi (Pb)-Sr-Ca-Cu-O systems. / Yada, Setsuo; Ikeda, Yasunori; Takada, Jun; Itoh, Hideaki; Yamamoto, Ryoichi; Takano, Mikio; Naka, Shigeharu.

In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 38, No. 8, 11.1991, p. 1048-1052.

Research output: Contribution to journalArticle

Yada, Setsuo ; Ikeda, Yasunori ; Takada, Jun ; Itoh, Hideaki ; Yamamoto, Ryoichi ; Takano, Mikio ; Naka, Shigeharu. / Effect of additive alkaline earth metal oxides on critical current donsity of superconductors in the Bi (Pb)-Sr-Ca-Cu-O systems. In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 1991 ; Vol. 38, No. 8. pp. 1048-1052.
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