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

T. Ishigaki, Ayako Yamamoto, F. Izumi, T. Kamiyama, H. Asano, Y. Syono

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Pages (from-to)357-366
Number of pages10
JournalPhysica C: Superconductivity and its Applications
Volume231
Issue number3-4
DOIs
Publication statusPublished - 1994 Oct 1
Externally publishedYes

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Oxygen
Atoms
oxygen
atoms
Oxidation
oxidation
Neutron powder diffraction
Superconducting materials
Structural properties
oxygen atoms
Metals
Annealing
Ions
valence
neutrons
X rays
annealing
Electrons
diffraction
metals

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Structural changes of PbBaSr(Y0.8Ca0.2)Cu3O7+z on oxygen introduction into block layers. / Ishigaki, T.; Yamamoto, Ayako; Izumi, F.; Kamiyama, T.; Asano, H.; Syono, Y.

In: Physica C: Superconductivity and its Applications, Vol. 231, No. 3-4, 01.10.1994, p. 357-366.

Research output: Contribution to journalArticle

Ishigaki, T. ; Yamamoto, Ayako ; Izumi, F. ; Kamiyama, T. ; Asano, H. ; Syono, Y. / Structural changes of PbBaSr(Y0.8Ca0.2)Cu3O7+z on oxygen introduction into block layers. In: Physica C: Superconductivity and its Applications. 1994 ; Vol. 231, No. 3-4. pp. 357-366.
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abstract = "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.",
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