Orthorhombic-to-Tetragonal Transition in Re(1+x)Ba(2-x)Cu3O(7+ delta) (Re=Nd, Sm, and Eu)

Abstract

The orthorhombic-to-tetragonal structural phase transition in the high-Tc superconducting oxides of the type R1+xBa2-xCu3O7 delta (R (for rare earth) = Nd, Sm, and Eu) has been investigated using powder x-ray diffraction, dc resistivity, and thermogravimetric techniques. It was found that the orthorhombic-to-tetragonal transition occurs for samples whose nominal stoichiometric content of oxygen is greater than 7.0 (0 delta 0.3) as compared to less than 7.0 in YBa2Cu3O7 delta. With increasing (R/Ba) ratio in R1+xBa2- xCu30 delta, a clear convergence of multiple orthorhombic peaks to a well- defined single tetragonal peak was observed in the x ray diffraction pattern. The presence or orthorhombic distortion in this system appears to be essential for achieving 90-K superconductivity. Keywords: Barium, Copper oxides.

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Document Details

Document Type
Technical Report
Publication Date
Jul 15, 1988
Accession Number
ADA197174

Entities

People

  • E. A. Hayri
  • K. V. Ramanujachary
  • Martha Greenblatt
  • Shengxi Li

Organizations

  • Rutgers University Department of Chemistry and Chemical Biology

Tags

Communities of Interest

  • Advanced Electronics
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemistry
  • Convergence
  • Copper
  • Diffraction
  • Distortion
  • Elements
  • Low Temperature
  • Metals
  • Military Research
  • Oxides
  • Phase Transformations
  • Solid Solutions
  • Superconductivity
  • Transition Metals
  • Transitions
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Physics

Readers

  • Computational Linguistics
  • Superconducting Magnet Technology
  • Thin Film Deposition Science.