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 language | English |
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Pages (from-to) | 357-366 |
Number of pages | 10 |
Journal | Physica C: Superconductivity and its applications |
Volume | 231 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - 1994 Oct 1 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering