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U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
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Irradiation-Driven Restructuring of UO2 Thin Films: Amorphization and Crystallization.

Ashabari Majumdar1, Khachatur V Manukyan1, Stefania Dede1,2

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Summary
This summary is machine-generated.

Thin uranium dioxide (UO2) films were synthesized and irradiated, revealing a unique amorphization and subsequent recrystallization process under ion bombardment. This study offers robust actinide targets for nuclear science applications.

Keywords:
UO2 thin filmsamorphizationion irradiationrecrystallizationsolution combustion synthesis

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Area of Science:

  • Materials Science
  • Nuclear Engineering
  • Solid State Physics

Background:

  • Understanding radiation-induced material transformations is crucial for nuclear applications.
  • Thin film deposition techniques are essential for creating specialized targets.
  • Actinide research requires robust and well-characterized materials.

Purpose of the Study:

  • To investigate the irradiation-induced restructuring processes in thin uranium dioxide (UO2) films.
  • To develop a method for preparing pure, robust, and uniform thin-film actinide targets.
  • To explore nanoscale UO2 restructuring distinct from coarse-grained materials.

Main Methods:

  • Combustion synthesis of UO2 films on aluminum substrates using uranyl nitrate-acetylacetone-2-methoxyethanol solutions.
  • Thermal analysis for reaction initiation temperature and annealing.
  • Ion irradiation (Ar2+) to induce atomic displacements and subsequent characterization using X-ray fluorescence (XRF), alpha-particle emission spectroscopy, X-ray photoelectron spectroscopy (XPS), high-resolution electron microscopy, and electron diffraction.

Main Results:

  • Polycrystalline UO2 films with tunable thicknesses (35-260 nm) were successfully deposited.
  • Films exhibited stability under irradiation, with no sputtering degradation or changes in stoichiometry.
  • Early-stage irradiation led to complete amorphization and densification; prolonged irradiation induced surface crystallization and complete recrystallization into a highly crystalline film.

Conclusions:

  • A novel radiation-induced restructuring pathway for nanoscale UO2 was identified, differing from bulk materials.
  • The developed synthesis method yields high-quality thin UO2 films suitable for actinide targets.
  • These findings contribute to stockpile stewardship and fundamental actinide research.