Structural changes of PbBaSr(Y0.8Ca0.2)Cu3O7+z on oxygen introduction into block layers

T. Ishigaki, A. Tokiwa-Yamamoto, F. Izumi, T. Kamiyama, H. Asano, Y. Syono

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On oxygen annealing, Pb and Cu atoms in block layers become disordered much more readily in PbBaSrYCu3O7+z than in Pb2Sr2YCu3O8+z. In this work, the structural properties of PbBaSr(Y1-xCax)Cu3O7+z (x=0.2; z=0.0 and 1.35) were studied by X-ray and time-of-flight neutron powder diffraction and compared with those of Pb2Sr2(Y1-xCax)Cu3O8+z. In the superconductor (Tc=39 K) with z=0.0, Pb and Cu atoms in PbO-Cu block layers are perfectly ordered, in agreement with structural data reported by Rouillon et al. On the other hand, oxygen atoms are incorporated in the Cu layer in the oxygen-annealed sample with z=1.35, which gives rise to a disordered arrangement of Pb and Cu atoms in the block layers. Bond-valence-sum calculations show that the oxidation states of the Pb and Cu atoms respectively change from +2 to ca. +4 and from +1 to ca. +2 upon oxygen incorporation. The effects of lone electron pairs at Pb2+ ions and the structure of the block layer on metal disordering is discussed in connection with the difference in oxidation behavior between PbBaSr(Y1-xCax)Cu3O7+z and Pb2Sr2(Y1-xCax)Cu3O8+z.

元の言語English
ページ(範囲)357-366
ページ数10
ジャーナルPhysica C: Superconductivity and its applications
231
発行部数3-4
DOI
出版物ステータスPublished - 1994 10 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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