2026-09-30T23:36:59Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/427772023-08-28T18:43:33Zcom_20.500.14352_14col_20.500.14352_15

Room-temperature ferromagnetism in the mixtures of the TiO₂ and Co₃O₄ powders Serrano, A., A. Plaza, M. Pérez García, Lucas Venta, J. de la LLopis, J. García, M. A. ©2009 The American Physical Society. Artículo firmado por más de diez autores. This work was supported by the Spanish Council for Scientific Research through the CSIC Projects No. 2006- 50F0122 and No. 2007-50I015 and Spanish Ministry of Science and Education through the Projects No. MAT2007- 66845-C02-01 and No. FIS-2008-06249. We acknowledge the European Synchrotron Radiation Facility for provision of synchrotron radiation facilities, and we would like to thank the SpLine CRG Beamline staff for assistance during x-ray absorption experiments. 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. 2023-06-20T00:35:45Z 2023-06-20T00:35:45Z 2009-04 journal article 1098-0121 10.1103/PhysRevB.79.144405 https://hdl.handle.net/20.500.14352/42777 http://dx.doi.org/10.1103/PhysRevB.79.144405 https://journals.aps.org eng MAT2007- 66845-C02-01 FIS-2008-06249 2006- 50F0122 2007-50I015 open access American Physical Society