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Title: Molten salt flux synthesis and structure of the new layered uranyl tellurite, K{sub 4}[(UO{sub 2}){sub 5}(TeO{sub 3}){sub 2}O{sub 5}]

The reaction of UO{sub 3} and TeO{sub 3} with a KCl flux at 800 deg. C for 3 days yields single crystals of K{sub 4}[(UO{sub 2}){sub 5}(TeO{sub 3}){sub 2}O{sub 5}]. The structure of the title compound consists of layered, two-dimensional {sub {infinity}}{sup 2}[(UO{sub 2}){sub 5}(TeO{sub 3}){sub 2}O{sub 5}]{sup 4-} sheets arranged in a stair-like topology separated by potassium cations. Contained within these sheets are one-dimensional uranium oxide ribbons consisting of UO{sub 7} pentagonal bipyramids and UO{sub 6} tetragonal bipyramids. The ribbons are in turn linked by corner-sharing with trigonal pyramidal TeO{sub 3} units to form sheets. The lone-pair of electrons from the TeO{sub 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. Crystallographic data (193K, MoK{alpha}, {lambda}=0.71073A): triclinic, space group P1-bar , a=6.8514(5)A, b=7.1064(5)A, c=11.3135(8)A, {alpha}=99.642(1){sup o}, {beta}=93.591(1){sup o}, {gamma}=100.506(1){sup o}, V=531.48(7)A{sup 3}, Z=1,R(F)=4.19% for 149 parameters and 2583 reflections with I>2{sigma}(I)
Authors:
 [1] ;  [2]
  1. Department of Chemistry and Biochemistry, E.C. Leach Nuclear Science Center, Auburn University, Auburn, AL 36849 (United States)
  2. Department of Chemistry and Biochemistry, E.C. Leach Nuclear Science Center, Auburn University, Auburn, AL 36849 (United States). E-mail: albreth@auburn.edu
Publication Date:
OSTI Identifier:
20729102
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 178; Journal Issue: 9; Other Information: DOI: 10.1016/j.jssc.2005.06.043; PII: S0022-4596(05)00302-6; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CATIONS; CRYSTALLOGRAPHY; ELECTRONS; FLUX SYNTHESIS; MOLTEN SALTS; OXYGEN COMPOUNDS; POTASSIUM CHLORIDES; POTASSIUM COMPOUNDS; SPACE GROUPS; TELLURIUM COMPOUNDS; TRICLINIC LATTICES; URANIUM TRIOXIDE; URANYL COMPOUNDS