Structural Study on High-TcSuperconductor Bi2-x(Ca, Sr)3Cu2+xO9-y

Tsuyoshi Kajitani, Keiji Kusaba, Masae Kikuchi, Norio Kobayashi, Yasuhiko Syono, Timothy B. Williams, Makoto Hirabayashi

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Abstract

The crystal structure of the high-TcBi2-x(Ca, Sr)3Cu2+xO9-ywith x=0.2 and y=0.78 was studied by means of neutron and X-ray powder diffraction. Since the unit cell parameters were relatively large for powder diffraction analysis, an averaged structure was refined, assuming an orthorhombic sub-cell (a=5.39 Å, b=5.39 Å and c=30.37 Å) which corresponds to 1/5 of the unit cell: This is a derivative of Bi4Ti3O12The double perovskite unit interleaved by the double bismuthlayers is B-type, i.e. a CuO6octahedron is surrounded by eight alkaline earth metal ions. The pyramidal CuO5configuration is found in this oxide. The copper valency is estimated at about 2.3 on the basis of the determined chemical composition.

Original languageEnglish
Pages (from-to)L587-L590
JournalJapanese Journal of Applied Physics
Volume27
Issue number4A
DOIs
Publication statusPublished - 1 Jan 1988
Externally publishedYes

Keywords

  • Ca-Sr-Bi-Cu superconductor
  • Neutron diffraction
  • Structure determination
  • X-ray diffraction

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