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Molten salt flux synthesis and structure of the new layered uranyl tellurite, K4[(UO2)5(TeO3)2O5]

✍ Scribed by Jonathan D. Woodward; Thomas E. Albrecht-Schmitt

Book ID: 104029317
Publisher: Elsevier Science
Year: 2005
Tongue: English
Weight: 295 KB
Volume: 178
Category: Article
ISSN: 0022-4596
DOI: 10.1016/j.jssc.2005.06.043

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✦ Synopsis

The reaction of UO 3 and TeO 3 with a KCl flux at 800 1C for 3 days yields single crystals of K 4 [(UO 2 ) 5 (TeO 3 ) 2 O 5 ]. The structure of the title compound consists of layered, two-dimensional 2

sheets arranged in a stair-like topology separated by potassium cations. Contained within these sheets are one-dimensional uranium oxide ribbons consisting of UO 7 pentagonal bipyramids and UO 6 tetragonal bipyramids. The ribbons are in turn linked by corner-sharing with trigonal pyramidal TeO 3 units to form sheets. The lone-pair of electrons from the TeO 3 groups are oriented in opposite directions with respect to one another on each side of the sheets rendering each individual sheet nonpolar. The potassium cations form contacts with nearby tellurite units and axial uranyl oxygen atoms.

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