Disordering of Pb and Cu arrangements in the block layers of Pb2Sr2YCu3O8+δ and PbBaSrYCu3O7+δ by oxygen introduction

Ayako Yamamoto, Fujio Izumi, Takeo Oku, Yasuhiko Syono

Research output: Contribution to journalArticle

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Abstract

The crystal structures and phase stabilities of oxygen-annealed Pb2Sr2YCu3O8+δ (Pb3212) and PbBaSrYCu3O7+δ (Pb2212) were investigated by X-ray powder diffraction, high-resolution transmission electron microscopy and thermogravitmetry. The Pb and Cu arrangements in block layers of these compounds depend on the oxidizing temperatures. Metal arrangements in the block layers of Pb3212 annealed at 440°C were very similar to those of quenched Pb3212. That is, the block layers are constructed by stacks of PbO, CuOδ and PbO layers, which is consistent with the results reported by Marezio et al. However, we found that the disordering of Pb and Cu in the block layers occured by annealing at 520°C, though the oxygen contents of the two phases annealed at 440°C and 520°C were nearly equal to each other. A similar structural change was also observed in Pb2212. The block layers in Pb2212 were completely ordered to form PbO and Cu layers by annealing at 290°C, but they became disordered by annealing at 460°C. The metal disordering at relatively low temperatures around 500°C reflects the fact that the oxygen introduction enhances atomic diffusion. The annealing temperature region where the metal-disordered phase of Pb3212 is formed is quite narrow, because the CuOδ layer sandwiched by two PbO layers is very stable, while the corresponding temperature region for Pb2212 is much wider.

Original languageEnglish
Pages (from-to)243-252
Number of pages10
JournalPhysica C: Superconductivity and its Applications
Volume215
Issue number3-4
DOIs
Publication statusPublished - 1993 Oct 1
Externally publishedYes

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Annealing
Oxygen
Metals
oxygen
Temperature
Phase stability
annealing
High resolution transmission electron microscopy
X ray powder diffraction
Crystal structure
metals
temperature
transmission electron microscopy
crystal structure
high resolution
diffraction
x rays

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Disordering of Pb and Cu arrangements in the block layers of Pb2Sr2YCu3O8+δ and PbBaSrYCu3O7+δ by oxygen introduction. / Yamamoto, Ayako; Izumi, Fujio; Oku, Takeo; Syono, Yasuhiko.

In: Physica C: Superconductivity and its Applications, Vol. 215, No. 3-4, 01.10.1993, p. 243-252.

Research output: Contribution to journalArticle

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abstract = "The crystal structures and phase stabilities of oxygen-annealed Pb2Sr2YCu3O8+δ (Pb3212) and PbBaSrYCu3O7+δ (Pb2212) were investigated by X-ray powder diffraction, high-resolution transmission electron microscopy and thermogravitmetry. The Pb and Cu arrangements in block layers of these compounds depend on the oxidizing temperatures. Metal arrangements in the block layers of Pb3212 annealed at 440°C were very similar to those of quenched Pb3212. That is, the block layers are constructed by stacks of PbO, CuOδ and PbO layers, which is consistent with the results reported by Marezio et al. However, we found that the disordering of Pb and Cu in the block layers occured by annealing at 520°C, though the oxygen contents of the two phases annealed at 440°C and 520°C were nearly equal to each other. A similar structural change was also observed in Pb2212. The block layers in Pb2212 were completely ordered to form PbO and Cu layers by annealing at 290°C, but they became disordered by annealing at 460°C. The metal disordering at relatively low temperatures around 500°C reflects the fact that the oxygen introduction enhances atomic diffusion. The annealing temperature region where the metal-disordered phase of Pb3212 is formed is quite narrow, because the CuOδ layer sandwiched by two PbO layers is very stable, while the corresponding temperature region for Pb2212 is much wider.",
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