The oxidized states of uranium oxides was obtained with ignition method when UO_2 powders has been exposed to air for three years and the reducing UO_2 power oxidized; UO_2 powder was made into U_3O_8 which is the highest oxidizing state and decided O...
The oxidized states of uranium oxides was obtained with ignition method when UO_2 powders has been exposed to air for three years and the reducing UO_2 power oxidized; UO_2 powder was made into U_3O_8 which is the highest oxidizing state and decided O/U ratios with the increased weights.
According to the literature U_3O_8 was got by igniting sample in air for five or four hours at 470℃ and 900℃ respectively, and determined U_3O_8 with NAD(Nitric acid dissolution of Uranium oxide).
The O/U ratio of exposed to air UO_2+x was 2.17 and that of reduced uranium oxide 2.02.
In addition, the experiment of stable oxidizing states and those heat contents with TGA & DTA was performed.