0000000000255908

AUTHOR

Gilbert Calvarin

showing 2 related works from this author

ChemInform Abstract: Neutron Diffraction Study of the in situ Oxidation of UO2.

2009

This paper discusses uranium oxide crystal structure modifications that are observed during the low-temperature oxidation which transforms UO2 into U3O8. The symmetries and the structural parameters of UO2, β-U4O9, β-U3O7, and U3O8 were determined by refining neutron diffraction patterns on pure single-phase samples. Neutron diffraction patterns were also collected during the in situ oxidation of powder samples at 483 K. The lattice parameters and relative ratios of the four pure phases were measured during the progression of the isothermal oxidation. The transformation of UO2 into U3O8 involves a complex modification of the oxygen sublattice and the onset of complex superstructures for U4O…

In situchemistry.chemical_compoundChemistryLattice (order)KineticsNeutron diffractionUranium oxidePhysical chemistrychemistry.chemical_elementGeneral MedicineCrystal structureOxygenIsothermal processChemInform
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Neutron Diffraction Study of the in Situ Oxidation of UO2

2009

This paper discusses uranium oxide crystal structure modifications that are observed during the low-temperature oxidation which transforms UO(2) into U(3)O(8). The symmetries and the structural parameters of UO(2), beta-U(4)O(9), beta-U(3)O(7), and U(3)O(8) were determined by refining neutron diffraction patterns on pure single-phase samples. Neutron diffraction patterns were also collected during the in situ oxidation of powder samples at 483 K. The lattice parameters and relative ratios of the four pure phases were measured during the progression of the isothermal oxidation. The transformation of UO(2) into U(3)O(8) involves a complex modification of the oxygen sublattice and the onset of…

In situKineticsNeutron diffractionchemistry.chemical_element02 engineering and technologyCrystal structure[CHIM.MATE]Chemical Sciences/Material chemistry010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesOxygenIsothermal process0104 chemical sciencesInorganic Chemistrychemistry.chemical_compoundCrystallographychemistry[ CHIM.MATE ] Chemical Sciences/Material chemistryLattice (order)Physical chemistryUranium oxidePhysical and Theoretical Chemistry0210 nano-technology
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