COMPLEX OXIDE, METHOD FOR PRODUCING SAME, AND EXHAUST GAS PURIFICATION CATALYST

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Provided are : a complex oxide that exhibits high redox ability even at low temperatures, has superior heat resistance, and stably maintains the characteristics thereof even when repeating oxidation/reduction at a high temperature; a method for producing the complex oxide; and an exhaust gas purification catalyst. The complex oxide contains over 0 and no greater than 20 parts by mass of Si in terms of SiO2 for every total of 100 parts by mass in terms of the oxides of rare earth metal elements including Ce, and performing a temperature-programmed reduction (TPR) measurement from 50°C to 900°C at a rate of temperature rise of 10°C/minute in a 10% hydrogen, 90% argon atmosphere and then performing oxidation processing for 0.5 hours at 500°C, has the characteristic of exhibiting a reduction rate of at least 1.5% at 400°C or under calculated from the results of performing the TPR measurement again.