Formation of the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system in various atmospheres

Naoya Kobayashi, Minoru Fukuhara, Akira Doi, Toshio Takada, Yoshihiro Kusano, Jun Takada, Yasunori Ikeda, Mikio Takano

Research output: Contribution to journalArticle

Abstract

Samples with compositions of Bi:Pb:(Sr,Ba):Ca:Cu = 0.9:0.2:(1.0-x,x):1.0:1.6, in which 0≤x≤0.07, were prepared by heating at 844°C in air after heating at 828°C in air or at 787°C in Ar. The Pb-free (or poor) low-Tc phase with a tetragonal structure was formed by heating at 828°C in air, while the heat treatment at 787°C in Ar led to formation of the Pb-rich low-Tc phase with an orthorhombic structure. The lattice parameter c of these low-Tc phases increases as x increases, resulting from the Ba substitution for Sr. By the final heating in air, the high-Tc phase forms through the Pb-rich low-Tc phase as well as the Pb-poor one. Ba substitution promotes the formation of the high-Tc phase and elongates its c-axis length.

Original languageEnglish
Pages (from-to)200-203
Number of pages4
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume40
Issue number2
Publication statusPublished - Feb 1993

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Heating
Air
Substitution reactions
Lattice constants
Heat treatment
Chemical analysis

ASJC Scopus subject areas

  • Mechanical Engineering
  • Metals and Alloys

Cite this

Kobayashi, N., Fukuhara, M., Doi, A., Takada, T., Kusano, Y., Takada, J., ... Takano, M. (1993). Formation of the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system in various atmospheres. Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, 40(2), 200-203.

Formation of the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system in various atmospheres. / Kobayashi, Naoya; Fukuhara, Minoru; Doi, Akira; Takada, Toshio; Kusano, Yoshihiro; Takada, Jun; Ikeda, Yasunori; Takano, Mikio.

In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 40, No. 2, 02.1993, p. 200-203.

Research output: Contribution to journalArticle

Kobayashi, N, Fukuhara, M, Doi, A, Takada, T, Kusano, Y, Takada, J, Ikeda, Y & Takano, M 1993, 'Formation of the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system in various atmospheres', Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, vol. 40, no. 2, pp. 200-203.
Kobayashi, Naoya ; Fukuhara, Minoru ; Doi, Akira ; Takada, Toshio ; Kusano, Yoshihiro ; Takada, Jun ; Ikeda, Yasunori ; Takano, Mikio. / Formation of the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system in various atmospheres. In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 1993 ; Vol. 40, No. 2. pp. 200-203.
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