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The oxygen-to-metal ratio in advanced nuclear fuels containing uranium, plutonium, and americium is crucial for reactor safety. This study reveals a unique mixed-valence state within the fuel matrix, impacting its properties.

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Area of Science:

  • Nuclear Materials Science
  • Solid State Chemistry
  • Radiochemistry

Background:

  • Uranium-plutonium mixed oxides with americium are candidates for Sodium Fast Reactor fuels.
  • The oxygen-to-metal (O/M) ratio significantly impacts fuel performance and reactor safety.
  • Understanding the oxidation states and phase behavior is critical for fuel development.

Purpose of the Study:

  • To investigate the O/M ratio and phase characteristics of U-Pu-Am-O2± fuel samples.
  • To determine the oxidation states of uranium, plutonium, and americium within the fuel matrix.
  • To elucidate the charge compensation mechanisms in these advanced nuclear fuels.

Main Methods:

  • Electron Probe Microanalysis (EPMA) for elemental distribution and homogeneity.
  • X-ray Powder Diffraction (XRD) for phase identification and lattice parameter determination.
  • X-ray Absorption Spectroscopy (XAS), specifically X-ray Absorption Near Edge Structure (XANES), for oxidation state analysis.

Main Results:

  • EPMA confirmed a homogeneous matrix with minor U- and Pu-rich inclusions.
  • XRD identified a primary fluorite structure phase (face-centered cubic) for the matrix, with a minor UO2 phase.
  • XANES experiments revealed the simultaneous presence of U5+ and Pu3+/Am3+ in the matrix, indicating mixed-valence behavior.
  • Calculated O/M ratios were correlated with lattice parameters derived from XRD data.

Conclusions:

  • The observed mixed-valence state of U, Pu, and Am is an intrinsic characteristic of the U-Pu-Am-O2± matrix phase.
  • This mixed-valence state suggests a unique charge compensation mechanism within the fuel, even in near-stoichiometric samples.
  • Thermodynamic calculations support the observed phase behavior and oxidation states in the U-Pu-Am-O system.