Crystal structure of K2V8O21 and Tl2V8O21

The crystal structures of K2V8O21 and Tl2V8O21 have been determined and refined, using both neutron and X-ray powder diffraction data. K2V8O21 (Tl2V8O21) crystallises in the monoclinic space group with the unit cell parameters a=14.9402(2) (15.1405(4)) A, b=3.61823(4) (3.61309(6)) A, c=14.7827(2) (1...

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Bibliographic Details
Published in:Solid state sciences 2005-01, Vol.7 (1), p.37-43
Main Authors: Tyutyunnik, Alexander P., Zubkov, Vladimir G., Krasil'nikov, Vladimir N., Svensson, Gunnar, Sayagués, Maria J.
Format: Article
Language:English
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Summary:The crystal structures of K2V8O21 and Tl2V8O21 have been determined and refined, using both neutron and X-ray powder diffraction data. K2V8O21 (Tl2V8O21) crystallises in the monoclinic space group with the unit cell parameters a=14.9402(2) (15.1405(4)) A, b=3.61823(4) (3.61309(6)) A, c=14.7827(2) (14.9712(2)) A and beta=91.072(1) deg (89.967(2) deg ). The structures consist of VO6 octahedra and VO5 pyramids forming [V8O21]2- units running along the b axis. These units can then be divided into three columns: (i) two edge-sharing VO5 pyramids, (ii) columns of rock-salt type structure and (iii) single chains of VO5 pyramids. The K/Tl ions are found in tunnels formed by the [V8O21]2- units.
ISSN:1293-2558
DOI:10.1016/j.solidstatesciences.2004.10.013