The crystal structure of Li4[(UO2)2W2O10)] and crystal chemistry of Li uranyl tungstates

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Erscheinungsjahr:
2007
Medientyp:
Text
Schlagworte:
  • uranyl tungstate
  • lithium
  • connectivity diagram
  • single crystal structure analysis
  • X-ray diffraction
Beschreibung:
  • The crystal structure of Li4[(UO2)2(W 2O10)] (1) has been solved by direct methods and refined to R1 = 0.036. The compound is orthorhombic, Cmc21, a = 7.3823(3), b = 14.0498(5), c = 10.1887(3) Å, V = 1056.77(7) Å3. The structure is based upon uranyl tungstate sheets with the composition [(UO2)2(W2O10)] 4-. The sheets are strongly corrugated and are parallel to the (001) plane. The sheet can be described as consisting of two types of chains. UO 7 pentagonal bipyramids share edges to form UO5 chains, whereas WO6 octahedra share corners to form WO5 chains. Both chains extend along the a axis. The Li+ cations reside in between the sheets providing their linkage into a three-dimensional structure. The structure can be considered as a derivative of complex oxides observed in the U-W-O and U-Mo-W-O systems. However, the topology of polyhedral linkage is different as a result of the presence of Li+ cations in the structure. The crystal chemistry of Li uranyl tungstates is discussed. © by Oldenbourg Wissenschaftsverlag.
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  • info:eu-repo/semantics/closedAccess
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Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/a0c52803-ac34-44fa-8683-fb85ec9baa49