Multiple intermediate valence in plutonium |
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Authors: | A V Mirmelstein E S Clementyev and O V Kerbel |
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Institution: | (1) Center for International Security and Cooperation, Stanford University, Stanford, CA 94305-6165, USA;(2) Department of Management Science and Engineering, Stanford University, Stanford, CA 94305-6165, USA |
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Abstract: | On the basis of the concepts of an intermediate-valence (IV) regime, an empirical model is proposed that quantitatively describes
the magnetic susceptibility, specific heat, and effective atomic volume of the low-temperature α phase and the gallium or
aluminum-stabilized face-centered cubic (fcc) δ phase of plutonium metal. The results of the paper allow one to estimate the
entropy change associated with the α → δ structural phase transition, the value of this change being very close to the experimental
value. According to the model, both phases of plutonium are systems with multiple intermediate valence, whose ground state
is a many-particle Kondo singlet, and fluctuations occur between 5f electron configurations with integer valences of 3+, 4+, and 2+. |
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