Abstract
Nanosized cerium oxide (CeO2) powders of different sizes were synthesized through homogeneous precipitation.Ferromagnetism was observed only in sub-20 nm powders. Ferromagnetic transitiontemperatures above room temperature and saturation magnetization values of0.023 μB per CeO2 formula unit were measured. Chemical analysis of the powders showed that traceferromagnetic impurities could not be responsible for the magnetic signals. Carefullycontrolled coulometric cyclic annealing studies combined with photoluminescencemeasurements showed that oxygen vacancies do not mediate the ferromagnetism in thesamples.
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