Crystal Structure and Superconductivity of the Mo-Stabilized Sr-Based YSr2Cu2.7Mo0.3O7-δ Compound

Shu-Fen Hu, R. S. Liu, S. C. Su, D. S. Shy, D. A. Jefferson

Research output: Contribution to journalEditorial

12 Citations (Scopus)

Abstract

The crystal structure of the Mo-stabilized Sr-based superconductor with nominal composition YSr2Cu2.7Mo0.3O7-δ has been analyzed by X-ray powder diffraction (XRD), electron diffraction, and high-resolution electron microscope techniques. The material crystallizes in the space group P4/mmm, with lattice parameters a = 3.8138(2) and c = 11.5204(8) Å. In the structure, the Mo ions are exclusively substituted for copper and are located mainly on the planar coordinated [Cu(2)] sites (∼24%), with only a small proportion on the chain [Cu(1)] sites (∼6%) in the parent YBa2Cu3O7 (123-type) structure. A disordering of the hole reservoir layer [Mo(1)/Cu(1)]-O(3) due to the displacement of the oxygen ions [O(3)] from their ideal positions of (0, 0.5, 0) to (0.13, 0.5, 0) was found in the XRD refinement, but neither a superlattice nor any form of intergrowth along the a* and c* directions was observed by electron diffraction and high-resolution electron microscopy. The chemical substitution of copper by molybdenum renders the YSr2Cu3O7 compound superconducting, with Tc up to 45 K.

Original languageEnglish
Pages (from-to)203-207
Number of pages5
JournalJournal of Solid State Chemistry
Volume112
Issue number1
DOIs
Publication statusPublished - 1994 Sep 1

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Superconductivity
Electron diffraction
X ray powder diffraction
Copper
superconductivity
electron diffraction
Crystal structure
Ions
copper
crystal structure
Molybdenum
High resolution electron microscopy
high resolution
oxygen ions
diffraction
Superconducting materials
Lattice constants
molybdenum
lattice parameters
electron microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Crystal Structure and Superconductivity of the Mo-Stabilized Sr-Based YSr2Cu2.7Mo0.3O7-δ Compound. / Hu, Shu-Fen; Liu, R. S.; Su, S. C.; Shy, D. S.; Jefferson, D. A.

In: Journal of Solid State Chemistry, Vol. 112, No. 1, 01.09.1994, p. 203-207.

Research output: Contribution to journalEditorial

Hu, Shu-Fen ; Liu, R. S. ; Su, S. C. ; Shy, D. S. ; Jefferson, D. A. / Crystal Structure and Superconductivity of the Mo-Stabilized Sr-Based YSr2Cu2.7Mo0.3O7-δ Compound. In: Journal of Solid State Chemistry. 1994 ; Vol. 112, No. 1. pp. 203-207.
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N2 - The crystal structure of the Mo-stabilized Sr-based superconductor with nominal composition YSr2Cu2.7Mo0.3O7-δ has been analyzed by X-ray powder diffraction (XRD), electron diffraction, and high-resolution electron microscope techniques. The material crystallizes in the space group P4/mmm, with lattice parameters a = 3.8138(2) and c = 11.5204(8) Å. In the structure, the Mo ions are exclusively substituted for copper and are located mainly on the planar coordinated [Cu(2)] sites (∼24%), with only a small proportion on the chain [Cu(1)] sites (∼6%) in the parent YBa2Cu3O7 (123-type) structure. A disordering of the hole reservoir layer [Mo(1)/Cu(1)]-O(3) due to the displacement of the oxygen ions [O(3)] from their ideal positions of (0, 0.5, 0) to (0.13, 0.5, 0) was found in the XRD refinement, but neither a superlattice nor any form of intergrowth along the a* and c* directions was observed by electron diffraction and high-resolution electron microscopy. The chemical substitution of copper by molybdenum renders the YSr2Cu3O7 compound superconducting, with Tc up to 45 K.

AB - The crystal structure of the Mo-stabilized Sr-based superconductor with nominal composition YSr2Cu2.7Mo0.3O7-δ has been analyzed by X-ray powder diffraction (XRD), electron diffraction, and high-resolution electron microscope techniques. The material crystallizes in the space group P4/mmm, with lattice parameters a = 3.8138(2) and c = 11.5204(8) Å. In the structure, the Mo ions are exclusively substituted for copper and are located mainly on the planar coordinated [Cu(2)] sites (∼24%), with only a small proportion on the chain [Cu(1)] sites (∼6%) in the parent YBa2Cu3O7 (123-type) structure. A disordering of the hole reservoir layer [Mo(1)/Cu(1)]-O(3) due to the displacement of the oxygen ions [O(3)] from their ideal positions of (0, 0.5, 0) to (0.13, 0.5, 0) was found in the XRD refinement, but neither a superlattice nor any form of intergrowth along the a* and c* directions was observed by electron diffraction and high-resolution electron microscopy. The chemical substitution of copper by molybdenum renders the YSr2Cu3O7 compound superconducting, with Tc up to 45 K.

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