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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

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High pressure study of Pu(0.92)Am(0.08) binary alloy.

V Klosek¹, J C Griveau, P Faure

¹CEA, Valduc, F-21120 Is-sur-Tille, France.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|June 23, 2011

Summary

This study investigated plutonium-americium alloys under pressure, revealing insights into electronic structure and phase stability. The research highlights the alloy's stability and unique electronic behaviors, crucial for understanding actinide materials.

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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films

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Area of Science:

Materials Science
Condensed Matter Physics
Nuclear Materials

Background:

Understanding the behavior of actinide alloys under pressure is critical for nuclear energy and materials science.
Plutonium-americium alloys exhibit complex electronic structures influenced by 5f electron localization.

Purpose of the Study:

To investigate the pressure-induced phase transitions and electrical resistivity of a Pu(0.92)Am(0.08) binary alloy.
To elucidate the relationship between atomic volume, electronic structure, and phase stability under pressure.
To explore the electronic behaviors and kinetic effects during phase transformations.

Main Methods:

X-ray diffraction was employed to determine phase transitions under applied pressure.
Electrical resistivity measurements were conducted as a function of pressure and temperature.
Analysis of atomic volume evolution provided insights into 5f electronic state delocalization.

Main Results:

A quasi-linear dependence of atomic volume on pressure (V=f(P)) was observed, indicating subtle electronic structure modifications.
The delta phase of the Pu(0.92)Am(0.08) alloy demonstrated high stability up to 0.7 GPa, with no martensitic-like transformation at low temperatures.
Remarkable electronic behaviors and temperature-dependent phase transformations with kinetic effects were identified.

Conclusions:

Pressure significantly influences the electronic structure and phase stability of Pu-Am alloys.
The study provides detailed information on 5f electron localization and delocalization processes under pressure.
Observed kinetic effects in phase transformations offer new avenues for research in actinide materials.