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Single Crystal Growth and Structural Characterization of a Novel Mixed-Valent Ternary Uranium Oxide, K8U7O24

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Abstract

Single crystals of K8U7O24 (K8U7.04O24) were grown out of a reactive potassium fluoride flux and characterized by single crystal X-ray diffraction. The reaction was carried out in a sealed copper tube. The title compound crystallizes in the cubic space group Im-3m with a = 8.65050(10) Å. The material exhibits an ordered perovskite structure type that is a 2 × 2 × 2 cubic superstructure of the CaTiO3 perovskite type. Six of the uranium atoms in the composition are in the +6 oxidation state, while the seventh one is +4. The uranium(VI) atom is located in a distorted UO6 octahedral coordination environment containing two short, 1.966(5) Å, and four long, 2.16260(10) Å, U–O bonds, consistent with the uranyl cation, UO2 2+. The uranium(IV) atom is in a regular octahedral environment with U–O bonds of 2.359(5) Å.

Graphical Abstract

The synthesis and crystal structure are reported for K8U7O24, a new complex uranium(IV/VI) oxide.

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Acknowledgments

Research supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award DE-SC0008664.

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Authors and Affiliations

  1. Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, 29208, USA

    Cory M. Read, Mark D. Smith & Hans-Conrad zur Loye

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  1. Cory M. Read
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  2. Mark D. Smith
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  3. Hans-Conrad zur Loye
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Correspondence to Hans-Conrad zur Loye.

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Read, C.M., Smith, M.D. & zur Loye, HC. Single Crystal Growth and Structural Characterization of a Novel Mixed-Valent Ternary Uranium Oxide, K8U7O24 . J Chem Crystallogr 44, 604–608 (2014). https://doi.org/10.1007/s10870-014-0555-x

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  • DOI: https://doi.org/10.1007/s10870-014-0555-x

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