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Journal of Structural Chemistry

, Volume 59, Issue 3, pp 618–626 | Cite as

New Fluoridozirconate with the Nonstoichiometric Composition Cs1+x(H2O)1–xMgZr2F11+x·2H2O (x ≈ 0.73): Structure and Thermal Properties

  • K. A. Gaivoronskaya
  • A. V. Gerasimenko
  • N. A. Didenko
Article

Abstract

New fluoridozirconate with the nonstoichiometric composition Cs1+x(H2O)1–xMgZr2F11+x·2H2O (x ≈ 0.73) (I) is synthesized, its structure is determined, and the thermal behavior is analyzed. In the structure a part of F atoms is split over two positions which results in the formation of two types of coordination polyhedra around the Zr atom: Hoard dodecahedron ZrF8 and pentagonal bipyramid ZrF7. There are also two types of combining Zr polyhedra into chains: by sharing edges and by sharing edges and vertices. MgF4(H2O)2 octahedra link infinite zirconium chains into layers. Between the layers cesium cations are located together with H2O molecules statistically replacing a part of cesium cations. Dehydration of I occurs in the temperature range 140–400 °C and is complicated by the process of its partial pyrohydrolysis.

Keywords

crystal structure fluoridozirconate crystal hydrate phase transition differential thermal analysis 

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • K. A. Gaivoronskaya
    • 1
  • A. V. Gerasimenko
    • 1
  • N. A. Didenko
    • 1
  1. 1.Institute of Chemistry, Far East BranchRussian Academy of SciencesVladivostokRussia

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