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- Title
New Fluoridozirconate with the Nonstoichiometric Composition Cs<sub>1+x</sub>(H<sub>2</sub>O)<sub>1-x</sub>MgZr<sub>2</sub>F<sub>11+x</sub>·2H<sub>2</sub>O (x ≈ 0.73): Structure and Thermal Properties.
- Authors
Gaivoronskaya, K. A.; Gerasimenko, A. V.; Didenko, N. A.
- 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.
- Subjects
NONSTOICHIOMETRIC compounds; ZIRCONIUM compounds; CRYSTAL structure; THERMAL properties; PYROHYDROLYSIS; CESIUM ions
- Publication
Journal of Structural Chemistry, 2018, Vol 59, Issue 3, p618
- ISSN
0022-4766
- Publication type
Article
- DOI
10.1134/S0022476618030162