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New pseudophase structure for alpha-Pu.

J Bouchet1, R C Albers, M D Jones

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|April 20, 2004
PubMed
Summary
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We propose a novel pseudophase crystal structure for plutonium

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Plutonium (Pu) exhibits a complex phase diagram with multiple allotropes.
  • Understanding the ground-state alpha phase of plutonium is crucial for its safe handling and applications.
  • Existing models struggle to fully explain the structural properties of plutonium phases.

Purpose of the Study:

  • To propose and validate a new pseudophase crystal structure for the ground-state alpha phase of plutonium.
  • To investigate the relationship between the proposed pseudophase and the known gamma phase of plutonium.
  • To provide a theoretical framework for exploring plutonium's phase diagram.

Main Methods:

  • Crystallographic analysis based on an orthorhombic distortion of the diamond structure.

Related Experiment Videos

  • First-principles electronic-structure calculations using the generalized-gradient approximation (GGA).
  • Comparative analysis of total energies and structural parameters between different plutonium phases.

    • Main Results:

    • A new pseudophase crystal structure for alpha-plutonium is proposed, derived from an orthorhombic distortion of the diamond structure.
    • Electronic-structure calculations show comparable total energies for the proposed pseudophase and the standard alpha phase.
    • The new structure shares similarities with the gamma-plutonium phase but with distinct axial ratios, explaining alpha-like characteristics.

    Conclusions:

    • The proposed pseudophase offers a new perspective on the ground-state structure of plutonium.
    • This work establishes a significant link between the complex alpha and gamma phases of plutonium.
    • The findings open avenues for advanced theoretical investigations into plutonium's rich phase diagram.