Abstract
The effect of light alloying elements in heavy matrices (Mo and Nb in U; Al, Ga, and Ce in Pu) on the magnitude of mean-square thermal atomic displacements has been analyzed. It is shown that light atoms decrease due to the appearance of an additional line in the phonon spectrum at a frequency above the Debye frequency of the matrix. This results in a stabilization of high-temperature (cubic) polymorphic modifications that have high solubility of alloying elements. The proposed model of changes allows us to explain both the stability of gamma-uranium and delta-plutonium in alloys at room temperature and an increase in the melting temperature of these metals upon alloying.
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