The Modulation and Synthesis for Bi2Sr2CuOδ under Ambient Oxygen Partial Pressure

Toshinobu Niinae, Yasunori Ikeda, Yoshichika Bando, Yoshihiro Kusano, Jun Takada

Research output: Contribution to journalArticle

Abstract

The cation stoichiometric Bi2Sr2CuOδ was successfully obtained by solid state reaction under ambient oxygen pressures (Po2=0.2,1atm). The modulation period as estimated by means of X-ray powder diffraction was λ≅4.7b for Bi2Sr2CuOδ synthesized under Po2=1atm, which is shorter than that for Bi2.125Sr1.875CuOz (λ≅15b). The Bi2Sr2CuOδ synthesized under Po2=1 atm showed metallic conductivity down to 2K, whereas it done under Po2=0.2 atm showed superconductivity with Tc≈8K. By annealing in Ar, Tc was raised up to 16K. At the same time, it was newly found that the modulation is disproportionate into two types with λ≅4.7b and λ≅5.5b.

Original languageEnglish
Pages (from-to)661-665
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume45
Issue number7
Publication statusPublished - Jul 1998

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Partial pressure
Modulation
Oxygen
Superconductivity
Solid state reactions
X ray powder diffraction
Cations
Positive ions
Annealing

Keywords

  • A new modulation mode
  • Monophasic BiSrCuO, superconductor
  • The cation stoichiometric Bi-2201

ASJC Scopus subject areas

  • Mechanical Engineering
  • Metals and Alloys

Cite this

The Modulation and Synthesis for Bi2Sr2CuOδ under Ambient Oxygen Partial Pressure. / Niinae, Toshinobu; Ikeda, Yasunori; Bando, Yoshichika; Kusano, Yoshihiro; Takada, Jun.

In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 45, No. 7, 07.1998, p. 661-665.

Research output: Contribution to journalArticle

Niinae, Toshinobu ; Ikeda, Yasunori ; Bando, Yoshichika ; Kusano, Yoshihiro ; Takada, Jun. / The Modulation and Synthesis for Bi2Sr2CuOδ under Ambient Oxygen Partial Pressure. In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 1998 ; Vol. 45, No. 7. pp. 661-665.
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