Crystallography between Kiel and St. Petersburg: review of collaboration and the crystal structure of Tl-5(SiO4)(OH) (2) Tl-6(SO4)(OH)(4)

Siidra, Oleg I., Britvin, Sergey N., Krivovichev, Sergey V., Klimov, Dmitry A. and Depmeier, Wulf (2014) Crystallography between Kiel and St. Petersburg: review of collaboration and the crystal structure of Tl-5(SiO4)(OH) (2) Tl-6(SO4)(OH)(4) Zeitschrift Fur Kristallographie, 229 (11). pp. 753-759.

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Abstract

In this contribution, we briefly review the results of collaborative research between crystallography groups in St. Petersburg and Kiel, and report on the synthesis and crystal structure of Tl-16(SiO4)(2)(SO4)(OH)(6) (1), a new and unusual compound obtained from highly-alkaline TlOH solution. Its structure [monoclinic, C2/m, a = 28.7140(18), b = 7.3686(5), c = 7.4426(5) angstrom, beta = 104.653(2)degrees, V = 1523.50(17) angstrom(3), R-1 = 0.066 for 1528 independent observed reflections] can be described as an alternation of electroneutral [Tl-5(SiO4)(OH)] and [Tl-3(SO4)(0.5)(OH)(2)] layers. The [Tl-5(SiO4)(OH)] layer consists of Tl(1)O-4 tetragonal pyramids sharing common corners with the SiO4 tetrahedra to form pseudotetragonal [Tl(SiO4)](3-) layers capped by OH(1)-centered [(OH)Tl-4] square pyramids with the Tl(2) and Tl(3) atoms in their apices. The [Tl-3(SO4)(0.5)(OH)(2)] layers contain OH(2)- and OH(3)-centered [(OH)Tl-4] square pyramids sharing common edges to form large (similar to 7.4 x 7.4 angstrom) cavities occupied by disordered (SO4) tetrahedra. The electroneutral character of the [Tl-5(SiO4)(OH)] and [Tl-6(SO4)(OH)(4)] layers allows us to suggest that the phases with these chemical compositions may form as independent compounds in highly alkaline Tl-bearing systems.

Document Type: Article
Additional Information: Times Cited: 0 SI 0
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
ISSN: 0044-2968
Projects: Future Ocean
Date Deposited: 30 Mar 2015 12:46
Last Modified: 28 Mar 2018 10:27
URI: http://eprints.uni-kiel.de/id/eprint/28235

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