Crystal structure of a new vanadate variety in the lomonosovite group: Na5Ti2O2[Si2O7](VO4) |
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| Institution: | 1. Department of Chemistry and Material Science Center of Philipps University, D-35032 Marburg, Germany;2. Department of Geology, Moscow Lomonosov State University, Vorob''evy Gory, 119899 Moscow, Russia;3. Institute of Crystallography, Academy of Sciences of Russia, Leninskji Prospect 59, 117333 Moscow, Russia;1. Institute of Geology, Komi Science Center, Ural Branch of the Russian Academy of Sciences, Syktyvkar 167982, Russian Federation;2. ITMO University, Saint Petersburg 197101, Russian Federation;3. Inorganic Systems Engineering Group, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, 2629 HZ Delft, The Netherlands;4. Institute of Chemistry, Komi Science Center, Ural Branch of the Russian Academy of Sciences, 167982 Syktyvkar, Russian Federation |
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| Abstract: | The title compound has been prepared by a flux crystallisation method and its crystal structure was determined by single crystal X-ray diffraction: space group P, a=5.309(1), b=7.133(1), c=14.746(2) Å, α=99.05(1), β=95.97(1), γ=90.08(1)°, wR2=0.073, R=0.028. The structure may be described as built by seidozerite modules of composition Na2Ti2O2Si2O7 — brucite-type layers of TiO6] and NaO6] octahedra embedded between layers of TiO6] octahedra, Si2O7] groups and NaO8] polyhedra. These almost centrosymmetrical triple-layers alternate along the c-axis with polar double-layer-modules of composition Na3VO4 formed by isolated VO4]3? anions and six- and four-coordinate Na cations. The crystal structure is discussed in context with minerals of the lomonosovite group. The thermal decomposition behaviour suggests a decay to the single modular components Na2Ti2O2Si2O7 and Na3VO4. |
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