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• W131794053 abstract "The local atomic structure of ensuremath{alpha}-Pu was investigated using x-ray absorption fine structure (XAFS) spectroscopy. XAFS spectra were obtained for a zone-refined ensuremath{alpha}-Pu and the results were compared to 32-year-old and Ce-doped (0.34 at. %) samples. X-ray diffraction (XRD) patterns were also measured for the zone-refined and 32-year-old materials. The extent of the Bragg peaks showed that amorphization of the 32-year-old sample had not occurred despite the prolonged exposure to self-radiation. Analogous to metastable ensuremath{delta}-Pu alloys, the local atomic structure around Pu for the zone-refined material shows the possible presence of noncrystallographic Pu-Pu distances. Conversely, the Ce and the 32-year-old sample show no evidence for such noncrystallographic distances. Disorder in the Pu local environment was found to be impurity dependent. The Ce-doped sample presented a larger Pu-Pu nearest neighbor disorder than the aged sample, although the total amount of Am, U, and He impurities was actually higher in the aged sample. The local environment around U and Ce impurities is consistent with these elements being in substitutional lattice sites. In addition, U and Ce do not introduce significant lattice distortion to their nearest neighbors. This is consistent with disorder being more related to the perturbation of the coupling between the electronic and crystal structure, or the Peierls--Jahn-Teller distortion that generates the monoclinic ensuremath{alpha}-Pu structure, and less to strain fields produced in the vicinity of the impurities." @default.
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• W131794053 date "2001-04-16" @default.
• W131794053 modified "2023-09-27" @default.
• W131794053 title "Local atomic structure of α-Pu" @default.
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• W131794053 doi "https://doi.org/10.1103/physrevb.63.174111" @default.
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