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Russian Chemical Bulletin

, Volume 59, Issue 4, pp 706–711 | Cite as

Synthesis and crystal structure of the new complex oxide Ca7Mn2.14 Ga5.86O17.93

  • A. S. Kalyuzhnaya
  • A. M. Abakumov
  • M. G. Rozova
  • H. D’Hondt
  • J. Hadermann
  • E. V. Antipov
Article

Abstract

The complex oxide Ca7Mn2.14Ga5.86O17.93 was synthesized by the solid-state reaction in a sealed evacuated quartz tube at 1000 °C. Its crystal structure was determined by electron diffraction and X-ray powder diffraction. The structure can be represented as a tetrahedral framework, viz., the polyanion [(Mn0.285Ga0.715)15O29.86]19- stabilized by the incorporated cation [Ca14GaO6]19+. The polycation consists of the GaO6 octahedra surrounded by the Ca atoms, which are arranged to form a cube capped at all places. The tetrahedral framework is partially disordered due to the presence of tetrahedra with two possible orientations in the positions (0, 0, 0) and (x, x, x) with x ≈ 0.15 and 0.17. The relationship between the Ca7Mn2.14Ga5.86O17.93 structures and related ordered phases with the symmetry F23, as well as the influence of the oxygen content on the ordering in the tetrahedral framework, are discussed.

Key words

complex manganese oxides crystal structure X-ray powder diffraction electron diffraction 

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Copyright information

© Springer Science+Business Media, Inc.  2010

Authors and Affiliations

  • A. S. Kalyuzhnaya
    • 1
  • A. M. Abakumov
    • 1
    • 2
  • M. G. Rozova
    • 1
  • H. D’Hondt
    • 2
  • J. Hadermann
    • 2
  • E. V. Antipov
    • 1
  1. 1.Department of ChemistryM. V. Lomonosov Moscow State UniversityMoscowRussian Federation
  2. 2.EMATUniversity of AntwerpAntwerpBelgium

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