The disordered cubic structure of Ca7Co3Ga 5O18

J. Grins, S. Ya Istomin, G. Svensson, J. P. Attfield, E. V. Antipov

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9 Citations (Scopus)

Abstract

The new mixed oxide having composition close to Ca7Co 3Ga5O18 was synthesized from CaCO3, Co3O4 and Ga2O3 at 1150 °C in air and studied by neutron and synchrotron X-ray powder diffraction, selected-area electron diffraction and high-resolution electron microscopy. The structure was refined, using time-of-flight (TOF) neutron powder diffraction data, in space group F432, with a=15.0487(4)Å and Z=8, to RF=0.7%. It is considerably disordered, with four different tetrahedral sites randomly occupied by Co and Ga atoms at a ratio of 1:2. The tetrahedra form a disordered (Co1/3Ga2/3)O2 3D-framework inside which isolated CoO6 octahedra, surrounded by 8 Ca atoms, are located. The structure is related to the ordered structure of Ca14Al 10Zn6O35. Electron diffraction patterns confirmed the symmetry and unit cell and revealed no diffuse scattering. High-resolution electron microscopy images showed the absence of extended structural defects.

Original languageEnglish
Pages (from-to)2197-2204
Number of pages8
JournalJournal of Solid State Chemistry
Volume178
Issue number7
DOIs
Publication statusPublished - Jul 2005
Externally publishedYes

Keywords

  • CaCoGaO
  • Crystal structure
  • Electron diffraction
  • Neutron diffraction
  • Synchrotron diffraction

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