Low temperature Mossbauer and magnetic characterizations of (á-Fe2O3)x – (TiO2)1-x oxides

V. BILOVOL, A.M. MUDARRA NAVARRO, W. T. HERRERA, D. R. SANCHEZ, E. M. BAGGIO-SAITOVITCH, C.E. RODRIGUEZ TORRES, F.H. SANCHEZ AND A.F. CABRERA

La Plata

Conferencia; XI Latin American Conference on the Applications of the Mossbauer Effect (LACAME); 2008

Fe-doped TiO2 samples with different Fe content prepared by mechanical alloying have been investigated by means of Mossbauer spectroscopy at 300 and 4.2K. The results indicate the coexistence of Fe2+ and Fe3+ ions in paramagnetic states at room temperature in the rutile structure. All samples present magnetic order at 4.3 K that increases with the Fe concentration. This fact could be related to the Fe ions are closer in the rutile matrix when the Fe concentration increases. The temperature evolution of the magnetic order was followed for the 15 at. % of Fe sample. The ternary oxide formed at this composition orders below 20K reaching almost a totally magnetic order at 4.3K.