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Tailoring Triuranium Octoxide into Multidimensional Uranyl Fluoride Micromaterials.

Harry Jang1, Frederic Poineau1

  • 1Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Las Vegas, Nevada 89154, United States.

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Summary

Researchers developed new methods to create uranium fluoride micromaterials with controlled shapes. This research expands the possibilities for actinide fluoride microstructures, advancing nuclear materials science.

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Area of Science:

  • Materials Science, Nuclear Chemistry, Actinide Chemistry

Background:

  • Uranium microstructured materials are crucial for nuclear applications like isotope production and reactor fuels.
  • Existing research primarily focuses on uranium oxide microspheres, leaving other morphologies largely unexplored.
  • Developing novel uranium halide and fluoride micromaterials with controlled shapes is essential for advancing nuclear technologies.

Purpose of the Study:

  • To explore the synthesis of unexplored uranium fluoride micromaterials with diverse morphologies.
  • To evaluate the fluorination of uranium oxide precursors using solid-gas reactions for controlled shape fabrication.
  • To establish efficient methods for producing uranium fluoride microrods, microplates, and microspheres.

Main Methods:

  • Fluorination of uranium oxide (U3O8 and UO2) microspheres, microrods, and microplates using hydrogen fluoride gas (HF(g)) and ammonium bifluoride (ABF).
  • HF(g) was generated from the thermal decomposition of silver bifluoride (SBF) in an autoclave at 250 °C.
  • Characterization of the resulting uranium fluoride microstructures, including morphology, size, and yield.

Main Results:

  • High yields (~90%) of uranium oxyfluoride (UO2F2) microrods and microplates were successfully synthesized from U3O8 precursors using SBF.
  • The synthesized UO2F2 microrods (3-20 μm) and microplates (1-7.5 μm) retained the morphology of their U3O8 counterparts.
  • Agglomerated (NH4)3UO2F5 and UO2F2 microspheres (2-3.5 μm) were produced from U3O8 microspheres using ABF; UO2 microspheres did not yield fluoride products.

Conclusions:

  • The fluorination of U3O8 microrods and microplates with SBF is an efficient method for producing UO2F2 microrods and microplates.
  • This study successfully demonstrates the preparation of diverse uranium fluoride microstructures (microspheres, microrods, microplates).
  • The developed methods open avenues for novel actinide fluoride micromaterials with tailored properties for various nuclear applications.