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Alpha-plutonium's polycrystalline elastic moduli over its full temperature range.

A Migliori1, C Pantea, H Ledbetter

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. migliori@cybermesa.com

The Journal of the Acoustical Society of America
|October 2, 2007
PubMed
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Elastic moduli of alpha-plutonium were measured, revealing significant stiffening upon cooling without phase transitions. This behavior is attributed to 5-f electron delocalization, impacting its mechanical properties.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nuclear Materials

Background:

  • Alpha-plutonium exhibits complex mechanical properties.
  • Understanding its elastic behavior is crucial for material applications and safety.

Purpose of the Study:

  • To measure the temperature dependence of alpha-plutonium's elastic moduli.
  • To investigate the underlying mechanism responsible for its unique mechanical response.

Main Methods:

  • Polycrystal elastic moduli (bulk and shear) were measured using mechanical testing.
  • Measurements were conducted across a temperature range from 18 K to approximately 400 K.

Main Results:

  • Both bulk and shear moduli showed a large, smooth 50% increase upon cooling, indicating no phase transitions.

Related Experiment Videos

  • A low Poisson ratio (0.18) and a high Gruneisen parameter (5.3) were observed.
  • The Debye temperature was determined to be 207 K, higher than previous estimates.

    • Conclusions:

    • The observed elastic behavior, including significant stiffening and a near-invariant Poisson ratio, is attributed to 5-f electron localization-delocalization.
    • This electronic mechanism governs alpha-plutonium's unique mechanical properties across the studied temperature range.