CERIA-ZIRCONIA MIXED OXIDE AND METHOD FOR PRODUCING SAME

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Provided is a ceria-zirconia mixed oxide which has small changes in mode pore diameter and/or pore volume before and after a high temperature tolerance test. A CZ mixed oxide which has a component composition, in mass ratio, of 30 to 80% of zirconia, 0 to 20% of a total of one type of more of oxides of the third element selected from yttrium and rare earth elements of atomic number of 57 to 71 (except cerium and promethium), and a balance of ceria and unavoidable impurities, wherein the mixed oxide is characterized in that the crystal phase after a tolerance test of heating the same for five hours at a temperature condition of 1100°C atmosphere is solid solution phase only, a ratio (b/a) of mode diameter (b) of pore distribution after the tolerance test with respect to mode diameter (a) before the tolerance test is 1.0 to 2.0, and/or a ratio (d/c) of pore volume (d) after the tolerance test with respect to pore volume (c) before the tolerance test is 0.20 to 1.00.