Production of sintered oxide and oxides of the raw material powder sintered body

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PROBLEM TO BE SOLVED : To provide a method of manufacturing a high density oxide sintered compact having a high density enough to be used for a material of SOFC (a solid oxide fuel cell) or the like even when a precursor of the oxide sintered compact is sintered at a temperature lower than the conventional sinterintg temperature and raw material powder for the oxide sintered compact. SOLUTION : The oxide sintered compact containing cerium, Ln and T (where, Ln is at least one of rare earth metal elements except Ce and Pm, T is at least one of transition metal elements, the content of cerium is ≥50 mol% and ≤99.9 mol%, the content of Ln is ≥0.01 mol% and ≤50 mol%, and T is ≥0 and ≤5 mol% per 100 mol% in total of cerium, Ln and T) is manufactured by preparing a cerium-rare earth metal salt and calcining by heat-treating to manufacture a cerium-rare earth metal oxide, mixing the cerium-rare earth metal oxide with a transition metal compound to manufacture the precursor and sintering the precursor at a temperature of ≥800°C and ≤1, 000°C for ≥0.5 hr and ≤24 hr. COPYRIGHT : (C)2007, JPO&INPIT