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

Research output: Contribution to journalArticle

18 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)73-80
Number of pages8
JournalPhysica C: Superconductivity and its applications
Volume193
Issue number1-2
DOIs
Publication statusPublished - 1992 Apr 1
Externally publishedYes

Fingerprint

Oxides
Structural properties
Rietveld method
Neutron powder diffraction
oxides
Fluorspar
Copper oxides
fluorite
copper oxides
pyramids
Superconducting transition temperature
Lattice constants
Monolayers
transition temperature
Oxygen
Heating
neutrons
Atoms
Defects
heating

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Structural properties of (Pb,Cu) (Sr,Nd)2(Ho,Ce)2Cu2O9-δ. / Maeda, Toshihiko; Sakai, Naomichi; Izumi, Fujio; Wada, Takahiro; Yamauchi, H.; Asano, Hajime; Tanaka, Shoji.

In: Physica C: Superconductivity and its applications, Vol. 193, No. 1-2, 01.04.1992, p. 73-80.

Research output: Contribution to journalArticle

Maeda, Toshihiko ; Sakai, Naomichi ; Izumi, Fujio ; Wada, Takahiro ; Yamauchi, H. ; Asano, Hajime ; Tanaka, Shoji. / Structural properties of (Pb,Cu) (Sr,Nd)2(Ho,Ce)2Cu2O9-δ. In: Physica C: Superconductivity and its applications. 1992 ; Vol. 193, No. 1-2. pp. 73-80.
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AU - Izumi, Fujio

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AU - Yamauchi, H.

AU - Asano, Hajime

AU - Tanaka, Shoji

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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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