Synthesis and characterization of novel 6-H perovskites Ba 2Co2-xSbxO6-y, 0.6 ≤ x ≤ 0.8 and x = 1.33 (Ba3CoSb2O9)

S. Ya Istomin, V. A. Koutcenko, E. V. Antipov, F. Lindberg, G. Svensson

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6-H perovskites with compositions Ba2Co2-xSb xO6-y, 0.6≤x≤0.8 and x=1.33 (Ba3CoSb 2O9) have been prepared in air at 1150°C. Refinements of the crystal structures of Ba2Co1.4Sb 0.6O6-y and Ba3CoSb2O9 were performed in space group P63/mmc, using neutron and X-ray powder diffraction data, respectively: Ba2Co1.4Sb 0.6O6-y a=5.7315(1)Å, c=14.1118(4)Å, R F2=0.0669, Rp=0.0464, χ2=1.39; Ba3CoSb2O9 a=5.85321(7)Å, c=14.4454(2)Å, RF2=0.0458, Rp=0.0258, χ2=1.24. In Ba3CoSb2O9 the antimony atoms are located in pairs of face-sharing octahedra separated by cobalt atoms in octahedral layers, while in Ba2Co 1.4Sb0.6O6-y a random distribution of B cations was found. In the latter structure, oxygen vacancies are preferably located in BaO3 planes separating the face-sharing octahedra. Electron diffraction and high-resolution electron microscopy studies showed that the structures are well ordered. Results of the magnetic susceptibility measurements of Ba3CoSb2O9 and Ba2Co 1.4Sb0.6O6-y are reported.

Original languageEnglish
Pages (from-to)1013-1022
Number of pages10
JournalMaterials Research Bulletin
Issue number7-8
Publication statusPublished - 8 Jun 2004
Externally publishedYes


  • A. Oxides
  • C. Electron microscopy
  • C. X-ray diffraction


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