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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
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Density functional study of PuC and PuC0.75O0.25.

Rong Yang1, Zhe Zhang1, Bin Tang2

  • 1School of Materials Science and Engineering, Chongqing Jiaotong University Chongqing 400074 PR China cqyr88@126.com.

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|December 10, 2025
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Summary
This summary is machine-generated.

This study investigates plutonium carbide (PuC) and its oxygen-substituted form (PuC0.75O0.25). Results show PuC0.75O0.25 is thermodynamically stable, harder, and prone to oxidation, explaining PuC

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Area of Science:

  • Materials Science
  • Computational Physics
  • Plutonium Chemistry

Background:

  • Plutonium carbide (PuC) is a key material in nuclear applications.
  • Understanding its structural, magnetic, and thermodynamic properties is crucial for safety and performance.
  • The influence of oxygen substitution on PuC properties requires detailed investigation.

Purpose of the Study:

  • To comprehensively study the structural, magnetic, electronic, thermodynamic, and elastic properties of PuC and PuC0.75O0.25.
  • To elucidate the impact of carbon-oxygen substitution on PuC's material characteristics.
  • To determine the driving force behind the oxidation and aging of PuC.

Main Methods:

  • Utilized density-functional theory (DFT) and DFT + U calculations.
  • Investigated nonmagnetic (NM), ferromagnetic (FM), and antiferromagnetic (AFM) configurations.
  • Calculated total energies, electronic density of states, thermodynamic parameters, elastic constants, and defect formation energies.

Main Results:

  • PuC0.75O0.25 exhibits an antiferromagnetic ground state, consistent with PuC.
  • Oxygen substitution introduces a new peak in the density of states and enhances thermodynamic properties (enthalpy, entropy, heat capacity).
  • PuC0.75O0.25 is predicted to be harder due to stronger Pu-O bonds, and the oxygen-substitution defect formation energy is highly spontaneous (-5.11 eV).

Conclusions:

  • The spontaneous formation energy of oxygen defects confirms a fundamental driving force for PuC oxidation and chemical aging.
  • PuC0.75O0.25 demonstrates distinct thermodynamic and elastic properties compared to PuC.
  • These findings provide essential data for future theoretical and experimental studies on PuC and its oxygenated forms.