Ce0.9Gd0.1O1.95 ceramics were prepared using a simple and effective process in this study. Without any prior calcination, the mixture of raw
materials was pressed and sintered directly. The reaction of the raw materials occurred during the heating up period by passing the calcination stage
in the conventional solid-state reaction method. More than 99.5% of theoretical density was obtained for Ce0.9Gd0.1O1.95 sintering at 1500–
1600 8C. Fine grains (<1 mm) formed in pellets sintered at 1450 8C. The homogeneity of grains increased with the sintering temperature. The
grains grew to >4.5 mm in pellets sintered at 1600 8C. The reactive-sintering process is proved to be a simple and effective method in preparing
Ce0.9Gd0.1O1.95 ceramics for solid electrolyte application.