Valence instability of uranium in U(Al1−x
Gex)3 |
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Authors: | A V Tyunis V A Shaburov Yu P Smirnov A E Sovestnov |
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Institution: | (1) B. P. Konstantinov St. Petersburg Institute of Nuclear Physics, Russian Academy of Sciences, 188350 Gatchina, Leningrad Region, Russia |
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Abstract: | The electronic structure of U and Ge in the solid solutions U(Al1−x
Gex)3 is investigated by measuring x-ray line shifts. It is shown that uranium has the mixed valence U3+ Rn](5f
3)-U4+ Rn](5f
2) over the entire composition range (0⩽x⩽1) and that the population of the uranium 5f shell increases by ∼0.28 5f electrons/U atom from UAl3 (x=0) to UGe3 (x=1). The electronic structure of Ge is close to the electronic structure of Ge metal over the entire composition range 0<x⩽1. No variation of the population of the Ge 4p shell is detected to within the experimental error (∼0.1 4p electrons/Ge atom) as the composition varies from x=0.2 to 1. It is established that the delocalization of a U 5f electron occurs as a result of its transition to the s or d band of the same uranium atom.
Fiz. Tverd. Tela (St. Petersburg) 39, 1505–1508 (September 1997) |
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