Journal of Experimental and Theoretical PhysicsJournal of Experimental and Theoretical Physics0044-45103034-641XRussian Academy of Science10.7868/S3034641X25110108ANOMALY OF CRYSTAL LATTICE THERMAL EXPANSION AND BULK MODULUS BEHAVIOR OF δ-PLUTONIUMANOMALY OF CRYSTAL LATTICE THERMAL EXPANSION AND BULK MODULUS BEHAVIOR OF δ-PLUTONIUMMirmelsteinA.V.MirmelsteinA.V. mirmelstein_av_noemail@ras.ruMativienkoV.N.MativienkoV.N. mativienko_vn_noemail@ras.ruFederal State Unitary Enterprise «Russian Federal Nuclear Center - Zabolokhin All-Russia Research Institute of Technical Physics»Federal State Unitary Enterprise «Russian Federal Nuclear Center - Zabolokhin All-Russia Research Institute of Technical Physics»Federal State Unitary Enterprise «Russian Federal Nuclear Center - Zabolokhin All-Russia Research Institute of Technical Physics»Federal State Unitary Enterprise «Russian Federal Nuclear Center - Zabolokhin All-Russia Research Institute of Technical Physics»010520251685692699

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.

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.

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