Structured and Magnetic Study of (Fe2O3)1-x-(TiO2)x Oxides

V. BILOVOL, A. M. MUDARRA NAVARRO, C.E. RODRÍGUEZ TORRES, A. F. CABRERA AND F. H. SÁNCHEZ

Rio de Janeiro

Conferencia; 9th International Conference on Nanostructured Materials; 2008

TiO2 oxide doped with transition metals could present ferromagnetism at room temperature, which make this type of materials suitable for potential technological applications. Actually the origin and nature of the observed magnetic behavior in this doped oxide are not totally understood. Furthermore different magnetic performance has been reported for the oxide doped with the same doping concentration of the impurity. The local impurity environment could play an important role in the observed magnetic behavior. In this work we report the study of Fe-doped TiO2 by means of Mössbauer spectroscopy and XAS. These techniques allow us characterize the local doping environment and relate it with the magnetic behavior.  Powders of α-Fe2O3 and TiO2 in appropriate concentrations (2.5, 5, 7 and 10 Fe at %) were mechanical alloyed during 12 h in air. The samples were characterized by Mössbauer spectroscopy (MS), XAS (EXAFS and XANES), X-ray diffraction (XRD) and magnetization versus applied field.