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We report here the observation of ferromagnetism (FM) at 300 K in mixtures ofTiO2 and Co3O4 powders despite the antiferromagnetic and diamagnetic characterof both oxides respectively. The ferromagnetic behavior is found in the earlystages of reaction and only for TiO2 in anatase structure; no FM is found foridentical samples prepared with rutile-TiO2. Optical spectroscopy and X-rayabsorption spectra confirm a surface reduction of octahedral Co+3->Co+2 in themixtures which is in the origin of the observed magnetism

Room-temperature ferromagnetism in the mixtures of the TiO2 and Co3O4 powders