Order-disorder transition in (Cu0.5Cr0.5)Sr2CuOx under high-pressure and high-temperature conditions

T. Drezen, S. M. Loureiro, T. Nagai, T. Asaka, Y. Matsui, A. Yamazaki, E. Takayama-Muromachi

Research output: Contribution to journalArticle

Abstract

The (Cu0.5Cr0.5)Sr2CuOx phase is the first member of the (Cu0.5Cr0.5)Sr2Can-1Cu nO2n+3 homologous series, having a layered structure with a single CuO2 plane. Numerous samples of this system were prepared under high-pressure/high-temperature conditions while varying the x value. The phases crystallize with tetragonal symmetry when the samples are quenched to room temperature, while they show orthorhombic symmetry when slow cooled (with the exception of the x = 5.0 sample). Transmission electron microscopic data collected on several samples have allowed us to suggest that the origin of the orthorhombic distortion in the slowly cooled phases lies in the ordered arrangement of copper, chromium, and oxygen atoms in the (Cu0.5Cr0.5) plane. We have also concluded on the absence of superconductivity in the (Cu, Cr)-1201 phases.

Original languageEnglish
Pages (from-to)348-354
Number of pages7
JournalJournal of Solid State Chemistry
Volume161
Issue number2
DOIs
Publication statusPublished - 2001 Nov 1

    Fingerprint

Keywords

  • (Cu, Cr)-1201
  • HRTEM
  • High-pressure synthesis
  • Order disorder transition
  • X-ray powder diffraction

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