Synthesis and characterization of Sr1-xLnxCoO 3-δ, Ln=Y, Sm-Tm, 0.1≤x≤0.5

S. Ya Istomin, O. A. Drozhzhin, G. Svensson, E. V. Antipov

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84 Citations (Scopus)


Different perovskite-related phases have been found in an X-ray powder diffraction (XRD) and transmission electron microscopy study of the Sr 1-xLnxCoO3-δ, Ln=Y, Sm-Tm, 0.1≤x≤0.5 systems. For the compositions Sr0.7Ho 0.3CoO3-δ; Sr1-xEuxCoO 3-δ, 0.3≤x≤0.4; Sr1-xGdxCoO 3-δ, 0.3≤x≤0.5; Sr1-xTbxCoO 3-δ, 0.3≤x≤0.4; Sr1-xDyxCoO 3-δ, 0.2≤x≤0.3 the formation of phases isostructural with the recently discovered perovskite related Sr0.7Y 0.3CoO2.62, a≈2×aper, c≈4×aper (aper perovskite subcell) was observed. The crystal and magnetic structures of Sr0.7Dy0.3CoO 2.62 were refined using neutron diffraction data (I4/mmm, a=7.6280(8), c=15.338(2) Å, Rp=0.0332, RF 2=0.0447, χ2=1.19). For x=0.1 the XRD study indicates formation of cubic perovskites with all rare-earth cations. Electron diffraction and high resolution electron microscopy studies performed on Sr 0.9Ln0.1CoO3-δ, Ln=Y, Eu, Dy, Ho revealed the presence of crystallites with brownmillerite (a≈2×aper, b≈4×aper, c≈2×aper), tetragonal perovskite (a≈aper, c≈2×aper) and Sr 0.7Ln0.3CoO2.62 type (a≈2×a per, c≈4×aper) structures. For Ln=Sm, only XRD cubic perovskite phases were observed for all compositions, 0.1≤x≤0.5. In the Sr0.5Eu0.5CoO3-δ sample, crystallites of perovskite, tetragonal perovskite and Sr0.7Ln 0.3CoO2.62 type were observed in the TEM study.

Original languageEnglish
Pages (from-to)539-546
Number of pages8
JournalSolid State Sciences
Issue number6
Publication statusPublished - Jun 2004
Externally publishedYes


  • Complex cobalt oxides
  • Electron microscopy
  • Perovskites
  • X-ray diffraction


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