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PuTMO3 systems crystal structures prediction and stability analysis based on first principles.

Zexin Jiang1, Jintao Wang2, Yilin Fang1

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|May 19, 2025
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This study predicts stable structures for 10 plutonium ternary metal oxide (PuTMO3) systems using computational methods. These findings aid in manufacturing advanced plutonium-based mixed oxide (MOX) fuels and recycling materials.

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First principlesPlutoniumStability analysisStructure prediction

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Nuclear Engineering

Background:

  • Plutonium ternary metal oxides (PuTMO3) are crucial for advanced nuclear fuel applications.
  • Understanding their structural stability is vital for material design and safety.

Purpose of the Study:

  • To predict the most stable crystal structures of 10 different PuTMO3 systems.
  • To evaluate their thermodynamic, mechanical, and dynamic properties.
  • To provide insights for controlling impurities in plutonium-based mixed oxide (MOX) fuels.

Main Methods:

  • Utilized particle swarm optimization and first-principle calculations.
  • Assessed thermodynamic stability via formation enthalpy.
  • Evaluated mechanical stability using established criteria.
  • Determined dynamic stability through phonon frequency calculations.

Main Results:

  • All 50 initial structures were thermodynamically stable.
  • 29 structures met mechanical stability criteria.
  • 10 structures demonstrated dynamic stability, including specific phases for PuTiO3, PuZnO3, PuGaO3, PuMnO3, PuNiO3, PuFeO3, PuVO3, and PuCrO3.
  • Electronic properties of the 10 stable structures were calculated.

Conclusions:

  • Identified 10 dynamically stable PuTMO3 structures.
  • These results offer critical data for the development of Pu-based MOX fuels.
  • The findings support strategies for impurity control and material recycling in nuclear fuel cycles.