Abstract
The linear thermal expansions of UO₂ and (U 1-y Ce y )O₂ pellet were measured from room temperature to 1400℃ as a function of Ce contents (0, 7.63, 14.84, and 21.68 mol%) by using the TMA(Thermo-Mechanical Analysis) method. From the measured data, the linear thermal expansion rate, the coefficient of linear thermal expansion and density variation with temperature were calculated, and the best-fitted temperature-dependent equations were recommended. It was shown that the rate and coefficient of (U 1-y Ce y )O₂ thermal expansion increased and the density decreased with increasing Ce contents.
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