TY - JOUR
T1 - Evolution of the Uranium Chemical State in Mixed-Valence Oxides
AU - Leinders, Gregory
AU - Bes, Rene
AU - Pakarinen, Janne
AU - Kvashnina, Kristina
AU - Verwerft, Marc
N1 - Score=10
PY - 2017/6/19
Y1 - 2017/6/19
N2 - A fundamental question concerning the chemical state of uranium in the binary oxides UO2, U4O9, U3O7, U3O8 and UO3 is addressed. By utilizing high energy resolution fluorescence detection X-ray absorption near edge spectroscopy (HERFD-XANES) at the urani-um M4 edge, a novel technique in the tender X-ray region, we obtain the distribution of formal oxidation states in the mixed-valence oxides U4O9, U3O7 and U3O8. Moreover, we clearly identi-fy a pivot from U(IV)-U(V) to U(V)-U(VI) charge compensation, corresponding with transition from a fluorite-type structure (U3O7) to a layered structure (U3O8). Such physicochemical properties are of interest to a broad audience of researchers and engineers active in domains ranging from fundamental physics, to nuclear industry and environmental science.
AB - A fundamental question concerning the chemical state of uranium in the binary oxides UO2, U4O9, U3O7, U3O8 and UO3 is addressed. By utilizing high energy resolution fluorescence detection X-ray absorption near edge spectroscopy (HERFD-XANES) at the urani-um M4 edge, a novel technique in the tender X-ray region, we obtain the distribution of formal oxidation states in the mixed-valence oxides U4O9, U3O7 and U3O8. Moreover, we clearly identi-fy a pivot from U(IV)-U(V) to U(V)-U(VI) charge compensation, corresponding with transition from a fluorite-type structure (U3O7) to a layered structure (U3O8). Such physicochemical properties are of interest to a broad audience of researchers and engineers active in domains ranging from fundamental physics, to nuclear industry and environmental science.
KW - Uranium chemical state
KW - Binary uranium oxides
KW - HERFD-XANES U M4-edge
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/26064144
U2 - 10.1021/acs.inorgchem.7b01001
DO - 10.1021/acs.inorgchem.7b01001
M3 - Article
SN - 0020-1669
VL - 56
SP - 6784
EP - 6787
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 12
ER -