Synthesis, crystal and magnetic structure of a novel brownmillerite-type compound Ca 2Co 1.6Ga 0.4O 5

S. Ya Istomin, S. V. Abdyusheva, G. Svensson, E. V. Antipov

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12 Citations (Scopus)

Abstract

The novel compound Ca 2Co 1.6Ga 0.4O 5 with brownmillerite (BM) structure has been prepared from citrates at 950°C. The crystal structure of Ca 2Co 1.6Ga 0.4O 5 was refined, from neutron powder diffraction (NPD) data, in space group Pnma, a=5.3022(6)Å, b=14.884(2)Å, c=5.5276(6)Å, χ2=1.798, RF2=0.0455, Rwp=0.0378 and Rp=0.0292. On the basis of the NPD refinement the compound was found to be a G-type antiferromagnet (space group Pn′m′a) at room temperature, with the magnetic moments of cobalt atoms directed along chains of tetrahedra in the BM structure. Electron diffraction and electron microscopy studies revealed disorder in the crystallites, which can be interpreted as the presence of slabs with BM-type structure of Pnma and I2mb symmetry. The crystal and magnetic structure of BM-type Ca 2Co 1.6Ga 0.4O 5 with G-type ordering of the magnetic moments of cobalt atoms.

Original languageEnglish
Pages (from-to)4251-4257
Number of pages7
JournalJournal of Solid State Chemistry
Volume177
Issue number11
DOIs
Publication statusPublished - Nov 2004
Externally publishedYes

Keywords

  • Antiferromagnetism
  • Brownmillerites
  • Ca Co Ga O
  • Electron diffraction
  • Neutron diffraction
  • Structure

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