Abstract
The influence of the surface structure on the reactivity of uranouranic oxides I, II and III was studied both by electron microscope using reprica technique and by X-ray diffractometer. U3O8 I, II and III were prepared from uranyl nitrate, ammonium diuranate and uranium peroxide, respectively. The results were as follows: (1) By electron microscope: U3O8 I particles were about 1 to 2 μ without heating, and sometimes grew up to about 10 μ by heating in the air at 900°C for 2 hr. Between U3O8 II and III particles there was no remarkable difference on the surface structure. These particles were 0.3 to 0.4 μ without heating, but grew up to 1 μ by heating in the air at 900°C for 2 hr. The diameters of these particles calculated from the specific surface area were similar to the results obtained by the reprica method in this report (2) By X-ray diffractometer: The line broadening was not observed in any faces of U3O8 I. The broadening was observed especially in (201) line of U3O8 II, but decreased by heating and disappeared above the vicinity of 850°C. The broadening was also observed in (201) and (020) lines of U3O8 III, and these broadenings decreased scarcely by heating.
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