%0 Journal Article
%A Serrano, A., A.
%A Plaza, M.
%A Pérez García, Lucas
%A Venta, J. de la
%A LLopis, J.
%A García, M. A.
%T Room-temperature ferromagnetism in the mixtures of the TiO₂ and Co₃O₄ powders
%D 2009
%@ 1098-0121
%U https://hdl.handle.net/20.500.14352/42777
%X We report here the observation of ferromagnetism (FM) at 300 K in mixtures of TiO₂ and Co₃O₄ powders despite the antiferromagnetic and diamagnetic characters of both oxides, respectively. The ferromagnetic behavior is found in the early stages of reaction and only for TiO₂ in anatase structure; no FM is found for identical samples prepared with rutile-TiO². Optical spectroscopy and x-ray absorption spectra confirm a surface reduction of octahedral Co^(+3) -> Co^(+2) in the mixtures which is in the origin of the observed magnetism.
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