it is an object of the present disclosure , to provide an oxygen storage material which may include optimum composition and structure of cu — mn spinel as osm , with a suitable doped zirconia , including niobium - zirconia support oxide for osm applications , which may include a chemical composition substantially free from rare metals . the osc properties of cu — mn spinel with a suitable doped zirconia , including niobium - zirconia support oxide as osm may be determined by comparing variations of cu — mn composition for determination of the optimum structure of spinel to achieve optimal osc properties and thermal stability , which may be particularly useful for treating exhaust gases produced by internal combustion engines , where lean / rich fluctuations in operating conditions may produce high variation in exhaust contaminants that may be removed , achieving optimal osc property of spinel at different temperatures , as well as thermal stability behavior of osm .