Oxygen-defect geometry in oxygen-rich La2CoxCu1-xO4+δ Layered Oxides

Alexandros Lappas, Kosmas Prassides

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


The structural properties of the La2CoxCu1-xO4+δ (x = 0.25, 0.75) series have been studied by powder neutron diffraction. Excess oxygen is accommodated as an O2- ion in the interstitial space defined by the lanthanide bilayers and leads to the displacement of some of the neighboring apical oxygens of the (Cu, Co)O6 octahedra from their normal lattice sites. The rigid tilt of the metal-oxygen octahedral units is, however, suppressed in the Co-rich system and the Fmmm space group is adopted. The Cu-rich compound is found to remain isostructural with the parent La2CuO4 system (space group Bmab). The defect occupies a unique site in the x = 0.25 system but is equally shared between two symmetry-equivalent positions for x = 0.75.

Original languageEnglish
Pages (from-to)59-67
Number of pages9
JournalJournal of Solid State Chemistry
Issue number1
Publication statusPublished - 1994 Jan

ASJC Scopus subject areas

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


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