Journal of Chemical Crystallography

, Volume 44, Issue 11–12, pp 604–608 | Cite as

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

  • Cory M. Read
  • Mark D. Smith
  • Hans-Conrad zur LoyeEmail author
Original Paper


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.


Crystal growth Single crystals Mixed-valent uranium oxides Fluoride flux 



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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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Cory M. Read
    • 1
  • Mark D. Smith
    • 1
  • Hans-Conrad zur Loye
    • 1
    Email author
  1. 1.Department of Chemistry and BiochemistryUniversity of South CarolinaColumbiaUSA

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