Accurate lattice parameter measurements of stoichiometric uranium dioxide

Direct Lattice Parameter Measurements Using HAADF-STEM

Lattice strain is generated in crystal structures as a result of atomic size differences between host atom and solute elements during substitutional alloying. Extensive work has been performed to study lattice parameter variation with alloying elements, primarily using diffraction methods. The global information provided by reciprocal space analysis, however, limits access to local structural d...

Configurational analysis of uranium-doped thorium dioxide

While thorium dioxide is already used industrially in high temperature applications, more insight is needed about the behaviour of the material as part of a mixed-oxide (MOX) nuclear fuel, incorporating uranium. We have developed a new interatomic potential model, commensurate with a prominent existing UO2 potential, to conduct configurational analyses of uranium-doped ThO2 supercells. Using th...

Molten uranium dioxide structure and dynamics.

Uranium dioxide (UO2) is the major nuclear fuel component of fission power reactors. A key concern during severe accidents is the melting and leakage of radioactive UO2 as it corrodes through its zirconium cladding and steel containment. Yet, the very high temperatures (>3140 kelvin) and chemical reactivity of molten UO2 have prevented structural studies. In this work, we combine laser heating,...

Mathematical Modeling of Fluorination Reaction of Uranium Dioxide and Evaluation of Existing Gas-Solid Reaction Models

Isochronous mass measurements of uranium fission products

B. Sun1,2, R. Knöbel1,3, H. Geissel1,3, Yu. A. Litvinov1,3, K. Beckert1, F. Bosch1, D. Boutin1,3, C. Brandau1, L. Chen3, I. Cullen4, C. Dimopoulou1, B. Fabian3, M. Hausmann5, O. Klepper1, C. Kozhuharov1, S. A. Litvinov1,3, M. Mazzocco1,6, F. Montes5, G. Münzenberg1, A. Musumarra7,8, S. Nakajima9, C. Nociforo1, F. Nolden1, T. Ohtsubo10, A. Ozawa11, Z. Patyk12, W. R. Plaß3, C. Scheidenberger1,3, ...