K-2 (UO2)As2O7 - the first uranium polyarsenate

Alekseev, E. V., Krivovichev, S. V. and Depmeier, W. (2007) K-2 (UO2)As2O7 - the first uranium polyarsenate Zeitschrift Fur Anorganische Und Allgemeine Chemie, 633 (8). pp. 1125-1126. DOI 10.1002/zaac.200700020.

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Abstract

Yellowish crystals of K-2[(UO2)AS(2)O(7)] (t) have been synthesized by solid-state reactions method. The structure of 1 [orthorhombic, Pmtnn, a = 12.601(2), b = 13.242(2), c = 5.621 (1) angstrom, V = 937.9(3)angstrom(3) Z = 4] has been solved by direct methods and refined to R-1 = 0.049, wR(2) = 0.1060 for 1059 observed reflections. The structure of I is based upon [(UO2)AS(2)O(7)](2-) sheets formed by corner sharing between [UO6](6-) distorted octahedra and [AS(2)O(7)](4-) polyarsenate groups. The K+ cations are either in eightfold or tenfold coordination and are located between the sheets. The topology of the uranyl arsenate sheet is related to silicate minerals of the melilite group and related synthetic silicate, aluminate and germanate compounds.

Document Type: Article
Keywords: uranium polyarsenate crystal structure solid-solution series crystal-structure structural variations thermal-expansion melilite topology
Research affiliation: Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
DOI etc.: 10.1002/zaac.200700020
ISSN: 0044-2313
Date Deposited: 12 Jan 2012 05:58
Last Modified: 09 Oct 2012 03:55
URI: http://eprints.uni-kiel.de/id/eprint/15559

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