Structural properties of (Pb,Cu) (Sr,Nd)2(Ho,Ce)2Cu2O9-δ

Toshihiko Maeda; Naomichi Sakai; Fujio Izumi; Takahiro Wada; H. Yamauchi; Hajime Asano; Shoji Tanaka

doi:10.1016/0921-4534(92)90871-9

Structural properties of (Pb,Cu) (Sr,Nd)₂(Ho,Ce)₂Cu₂O_9-δ

Toshihiko Maeda, Naomichi Sakai, Fujio Izumi, Takahiro Wada, H. Yamauchi, Hajime Asano, Shoji Tanaka

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

(Pb,Cu) (Sr,Nd)₂(Ho,Ce)₂Cu₂O_z (z≈8.64) was made superconducting by heating at 500°C in O₂ at a pressure of 90 atm. This oxide had a transition temperature (T_c) around 10 K. Its structure parameters were refined by the Rietveld method using neutron powder diffraction data. This compound belongs to space group 14/mmm and has a tetragonal unit cell with lattice constants, a=0.382496(8) nm and c=2.89862(7) nm. Atoms in fluorite-type layers and CuO₂ planes are firmly bound at their ideal positions, whereas a (Pb,Cu)O monolayer is highly disordered and defective. In addition, an apical oxygen site in a [CuO₅] pyramid is about 13% deficient. Such lattice instability in this oxide is discussed in connection with structural defects in other copper oxides.

Original language	English
Pages (from-to)	73-80
Number of pages	8
Journal	Physica C: Superconductivity and its applications
Volume	193
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(92)90871-9
Publication status	Published - 1992 Apr 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

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title = "Structural properties of (Pb,Cu) (Sr,Nd)2(Ho,Ce)2Cu2O9-δ",

abstract = "(Pb,Cu) (Sr,Nd)2(Ho,Ce)2Cu2Oz (z≈8.64) was made superconducting by heating at 500°C in O2 at a pressure of 90 atm. This oxide had a transition temperature (Tc) around 10 K. Its structure parameters were refined by the Rietveld method using neutron powder diffraction data. This compound belongs to space group 14/mmm and has a tetragonal unit cell with lattice constants, a=0.382496(8) nm and c=2.89862(7) nm. Atoms in fluorite-type layers and CuO2 planes are firmly bound at their ideal positions, whereas a (Pb,Cu)O monolayer is highly disordered and defective. In addition, an apical oxygen site in a [CuO5] pyramid is about 13% deficient. Such lattice instability in this oxide is discussed in connection with structural defects in other copper oxides.",

author = "Toshihiko Maeda and Naomichi Sakai and Fujio Izumi and Takahiro Wada and H. Yamauchi and Hajime Asano and Shoji Tanaka",

note = "Funding Information: We are indebted to M. Osawa of University of Tsukuba for his kind help in the neutron diffraction experiment. We also thank A. Ichinose of CRIEPI for his helpful discussion. This work was partially supported by NEDO.",

year = "1992",

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doi = "10.1016/0921-4534(92)90871-9",

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T1 - Structural properties of (Pb,Cu) (Sr,Nd)2(Ho,Ce)2Cu2O9-δ

AU - Maeda, Toshihiko

AU - Sakai, Naomichi

AU - Izumi, Fujio

AU - Wada, Takahiro

AU - Yamauchi, H.

AU - Asano, Hajime

AU - Tanaka, Shoji

N1 - Funding Information: We are indebted to M. Osawa of University of Tsukuba for his kind help in the neutron diffraction experiment. We also thank A. Ichinose of CRIEPI for his helpful discussion. This work was partially supported by NEDO.

PY - 1992/4/1

Y1 - 1992/4/1

N2 - (Pb,Cu) (Sr,Nd)2(Ho,Ce)2Cu2Oz (z≈8.64) was made superconducting by heating at 500°C in O2 at a pressure of 90 atm. This oxide had a transition temperature (Tc) around 10 K. Its structure parameters were refined by the Rietveld method using neutron powder diffraction data. This compound belongs to space group 14/mmm and has a tetragonal unit cell with lattice constants, a=0.382496(8) nm and c=2.89862(7) nm. Atoms in fluorite-type layers and CuO2 planes are firmly bound at their ideal positions, whereas a (Pb,Cu)O monolayer is highly disordered and defective. In addition, an apical oxygen site in a [CuO5] pyramid is about 13% deficient. Such lattice instability in this oxide is discussed in connection with structural defects in other copper oxides.

AB - (Pb,Cu) (Sr,Nd)2(Ho,Ce)2Cu2Oz (z≈8.64) was made superconducting by heating at 500°C in O2 at a pressure of 90 atm. This oxide had a transition temperature (Tc) around 10 K. Its structure parameters were refined by the Rietveld method using neutron powder diffraction data. This compound belongs to space group 14/mmm and has a tetragonal unit cell with lattice constants, a=0.382496(8) nm and c=2.89862(7) nm. Atoms in fluorite-type layers and CuO2 planes are firmly bound at their ideal positions, whereas a (Pb,Cu)O monolayer is highly disordered and defective. In addition, an apical oxygen site in a [CuO5] pyramid is about 13% deficient. Such lattice instability in this oxide is discussed in connection with structural defects in other copper oxides.

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Structural properties of (Pb,Cu) (Sr,Nd)₂(Ho,Ce)₂Cu₂O_9-δ

Abstract

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