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",

year = "1992",

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

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pages = "73--80",

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TY - JOUR

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

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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