| abstract |
(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a heat-resistant oxide exhibiting an oxygen storage capacity which is almost the same as the oxygen storage capacity at the initial stage of use even in a high temperature redox variable atmosphere. SOLUTION: General formula (In the formula, R represents a rare earth metal, z represents an oxygen defect amount, x Is an atomic ratio of 0.40 to 0.70 and y is 0.15 to The atomic ratio of 0.25 is shown, and x + y is 0.55. A range of ˜0.95 is shown. ) A heat-resistant oxide represented by. |