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N. Dacheux - One of the best experts on this subject based on the ideXlab platform.
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Local structure of actinide dioxide solid solutions Th$_{1-x}$U$_x$O$_2$ and Th$_{1-x}$Pu$_x$O$_2$
Inorganic Chemistry, 2006Co-Authors: S. Hubert, J. Purans, G. Heisbourg, P. Moisy, N. DacheuxAbstract:Extended X-ray absorption fine structure (EXAFS) has been utilized to investigate the local atomic structure around Th, U, and Pu atoms in polycrystalline mixed dioxides Th1-xMxO2 (with M = U, Pu) for x ranging from 0 to 1. The composition dependence of the two first-coordination-shell distances was measured throughout the entire composition range for both solid solutions. The first-shell distances vary slightly across the solid-solution composition with values close to those of the pure dioxide parents, indicating a bimodal cation-oxygen distribution. In contrast, the second-shell distance varies strongly with composition, with values close to the weighted amount average distances. Nevertheless, in both systems, the Lattice Cell parameters, deduced from the first- and second-shell bond determined by EXAFS, are very close to those measured from X-ray diffraction (XRD). They vary linearly with composition, accurately following Vegard's law.
B. Pannetier - One of the best experts on this subject based on the ideXlab platform.
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Vortex correlations in a fully frustrated two-dimensional superconducting network
EPL - Europhysics Letters, 2002Co-Authors: E. Serret, P. Butaud, B. PannetierAbstract:We have investigated the vortex state in a superconducting dice network using the Bitter decoration technique at several magnetic frustrations f=1/2 and 1/3. In contrast to other regular network geometries where the existence of a commensurate state was previouly demonstrated, no ordered state was observed in the dice network at f=1/2 and the observed vortex-vortex correlation length is close to one Lattice Cell.
S. Hubert - One of the best experts on this subject based on the ideXlab platform.
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Local structure of actinide dioxide solid solutions Th$_{1-x}$U$_x$O$_2$ and Th$_{1-x}$Pu$_x$O$_2$
Inorganic Chemistry, 2006Co-Authors: S. Hubert, J. Purans, G. Heisbourg, P. Moisy, N. DacheuxAbstract:Extended X-ray absorption fine structure (EXAFS) has been utilized to investigate the local atomic structure around Th, U, and Pu atoms in polycrystalline mixed dioxides Th1-xMxO2 (with M = U, Pu) for x ranging from 0 to 1. The composition dependence of the two first-coordination-shell distances was measured throughout the entire composition range for both solid solutions. The first-shell distances vary slightly across the solid-solution composition with values close to those of the pure dioxide parents, indicating a bimodal cation-oxygen distribution. In contrast, the second-shell distance varies strongly with composition, with values close to the weighted amount average distances. Nevertheless, in both systems, the Lattice Cell parameters, deduced from the first- and second-shell bond determined by EXAFS, are very close to those measured from X-ray diffraction (XRD). They vary linearly with composition, accurately following Vegard's law.
J. Purans - One of the best experts on this subject based on the ideXlab platform.
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Local structure of actinide dioxide solid solutions Th$_{1-x}$U$_x$O$_2$ and Th$_{1-x}$Pu$_x$O$_2$
Inorganic Chemistry, 2006Co-Authors: S. Hubert, J. Purans, G. Heisbourg, P. Moisy, N. DacheuxAbstract:Extended X-ray absorption fine structure (EXAFS) has been utilized to investigate the local atomic structure around Th, U, and Pu atoms in polycrystalline mixed dioxides Th1-xMxO2 (with M = U, Pu) for x ranging from 0 to 1. The composition dependence of the two first-coordination-shell distances was measured throughout the entire composition range for both solid solutions. The first-shell distances vary slightly across the solid-solution composition with values close to those of the pure dioxide parents, indicating a bimodal cation-oxygen distribution. In contrast, the second-shell distance varies strongly with composition, with values close to the weighted amount average distances. Nevertheless, in both systems, the Lattice Cell parameters, deduced from the first- and second-shell bond determined by EXAFS, are very close to those measured from X-ray diffraction (XRD). They vary linearly with composition, accurately following Vegard's law.
P. Moisy - One of the best experts on this subject based on the ideXlab platform.
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Local structure of actinide dioxide solid solutions Th$_{1-x}$U$_x$O$_2$ and Th$_{1-x}$Pu$_x$O$_2$
Inorganic Chemistry, 2006Co-Authors: S. Hubert, J. Purans, G. Heisbourg, P. Moisy, N. DacheuxAbstract:Extended X-ray absorption fine structure (EXAFS) has been utilized to investigate the local atomic structure around Th, U, and Pu atoms in polycrystalline mixed dioxides Th1-xMxO2 (with M = U, Pu) for x ranging from 0 to 1. The composition dependence of the two first-coordination-shell distances was measured throughout the entire composition range for both solid solutions. The first-shell distances vary slightly across the solid-solution composition with values close to those of the pure dioxide parents, indicating a bimodal cation-oxygen distribution. In contrast, the second-shell distance varies strongly with composition, with values close to the weighted amount average distances. Nevertheless, in both systems, the Lattice Cell parameters, deduced from the first- and second-shell bond determined by EXAFS, are very close to those measured from X-ray diffraction (XRD). They vary linearly with composition, accurately following Vegard's law.