Abstract
The change of specific surface area by heat treatment in the range of 700 to 1,200 deg C was measured for uranouranic oxides, U/sub 3/O/sub 8/ I, II, and III, which were prepared from uranyl nitrate, ammonium diuranate, and uranium peroxide, respectively. The influence of the change of the specific surface area on the reactivity of these oxides was also studied. The Poiseuille flow area and the Knudsen flow area at the steady state and the transient state were applied for measuring the specific surface area of U/sub 3/O/sub 8/. The reactivity was expressed by the rate of reduction. The results were as follows: (1) Generally speaking, the specific surface area decreased at an appreciable rate above 650 deg C and in the decrease became negligible above 900 deg C. (2) The change of the specific surface area had appreciable influence on the reactivity of U/sub 3/ O/sub 8/ I, II, and III, although some other factors might have some influence on U/sub 3/O/sub 8/ II and In. (auth)
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