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 journalArticlepeer-review


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
Issue number7
Publication statusPublished - Jul 1998


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

ASJC Scopus subject areas

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


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