Abstract
The heat capacities of UPd 3 and U(Pd 0.85Rh 0.15) 3 were measured over the temperature range between 290 and 1500 K by direct heating pulse calorimetry, which is a direct method for heat capacity measurements. The measured heat capacities of UPd 3 were smaller than the literature values up to 900 K. The heat capacities of U(Pd 0.85Rh 0.15) 3, obtained for the first time, were a little larger than those of UPd 3, but showed a similar temperature dependence. Since the oxygen partial pressures for the oxidation of UPd 3 and U(Pd 0.85Rh 0.15) 3 alloys were calculated from the heat capacities to be higher than that for MoO 2(s), UPd 3 and U(Pd 0.85Rh 0,15) 3 are not expected to be oxidized during the irradiation of UO 2 fuel.
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