In order to study the effect of CaO doping on UO2 and Gd2O3,
respectively, UO2-1 wt% CaO and Gd2O3-1 wt% CaO samples were
prepared by the above-mentioned method, which were sintered at
1100, 1200, 1300, 1400, 1500 and 1600 C in the sintering atmosphere
of H2 with the hold time of 3 h.