Mechanochemistry of the 5f-elements compounds. 5. Influence of the reaction medium on the mechanochemically induced reduction of U3O8

作者：Kovacheva P^*; Todorovsky D; Radev D

来源：Journal of Radioanalytical and Nuclear Chemistry, 2011, 287(1): 193-197.

DOI：10.1007/s10967-010-0666-6

• Mechanochemical activation
• Uranium oxides
• Reduction
• Oxygen release
• X-ray diffraction

The structure changes and the degree of reduction of U3O8 after mechanoactivation in agate and stainless steel vessels in different media are studied. Clearly expressed reduction of U(IV, VI) oxide, accompanied by oxygen release as a result of mechanochemical activation is observed. The highest degree of reduction is reached when mechanoactivation is performed in suspension with nonpolar organic solvents. The presence of acetaldehyde as a reducing agent did not cause valuable increase of the reduction process. Quantitative evaluation of the mechanochemically induced changes in the crystal structure of U3O8 is done. Decrease of the crystallite sizes of both the U3O8 and the reduced form, provoked by the mechanochemical treatment is observed for all the samples. No other uranium-contained compounds, formed during the mechanoactivation in the different media and mixtures were found.

• 出版日期2011-1