ANOMALY OF CRYSTAL LATTICE THERMAL EXPANSION AND BULK MODULUS BEHAVIOR OF δ-PLUTONIUM

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Abstract

Anomalous behavior of thermal expansion and bulk modulus for the face centered cubic phase of metallic plutonium is considered proceeding from the valence-fluctuating nature of the Pu 5f electrons. It is shown that the approach based on the fundamental properties of the systems the ground state of which is a quantum-mechanical superposition of the localized and itinerant electron configurations allows to quantitatively describe temperature dependence of the crystal lattice parameters and bulk moduli for both gallium-stabilized Pu-Ga alloy with fcc structure and unalloyed δ-Pu within the fcc phase existence region.

About the authors

A. V Mirmelstein

Federal State Unitary Enterprise «Russian Federal Nuclear Center - Zabolokhin All-Russia Research Institute of Technical Physics»

Email: mirmelstein@mail.ru
Snezhinsk, Russian Federation

V. N Mativienko

Federal State Unitary Enterprise «Russian Federal Nuclear Center - Zabolokhin All-Russia Research Institute of Technical Physics»

Author for correspondence.
Email: mirmelstein@mail.ru
Snezhinsk, Russian Federation

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