Synthesis and structural studies of Sr2Co2-xGaxO5, 0.3≤x≤0.8

F. Lindberg, S. Ya Istomin, P. Berastegui, G. Svensson, S. M. Kazakov, E. V. Antipov

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The novel oxide Sr2Co2-xGaxO5 with brownmillerite-type structure has been synthesized in the compositional range 0.3≤x≤0.8. Rietveld refinements using neutron powder diffraction data have been performed for the end compositions, x=0.3 and 0.8. The structure is best described in the space-group Icmm (no. 74) with unit cell parameters a=5.5678(6), 5.6126(7)Å, b=15.749(2), 15.733(2)Å and c=5.4599(6), 5.4559(7)Å for the x=0.3 and 0.8 compositions, respectively. The compounds were found to be G-type antiferromagnetic with the magnetic moments parallel to the c-axis. High-temperature magnetic susceptibility measurements confirmed the samples to be antiferromagnetic with Néel temperatures TN=505, 468 and 423K for the x=0.3, 0.5 and 0.8 samples, respectively. High-resolution transmission electron microscopy and electron diffraction studies confirmed the I-centred structure and revealed the presence of disorder.

Original languageEnglish
Pages (from-to)395-406
Number of pages12
JournalJournal of Solid State Chemistry
Issue number2
Publication statusPublished - Jul 2003
Externally publishedYes


  • Brownmillerite structure
  • Complex cobalt oxides
  • Electron diffraction
  • Neutron powder diffraction


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