INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Relation between structural and magnetic properties in (Ti,Fe)O2 powders obtained by mechanical milling
A. M. MUDARRA NAVARRO, V. BILOVOL, A.F. CABRERA AND C. E. RODRÍGUEZ TORRES
Workshop; At the Frontiers of Condensed Matter V; 2010
Fe-doped TiO2 samples with different Fe content were prepared by mechanical alloying. The samples were structurally and magnetically characterized by XRD, Mössbauer spectroscopy, X ray absorption spectroscopy (XAS), AC-susceptibility and magnetization measurements. A XAS results showed that Fe ions are incorporated into the rutile phase with oxygen coordination lower than that expected in this phase. The coordination number of oxygen decreases with the increase of Fe2+ ions as it was previously found in milled samples of TiO2 doped with hematite. The RT Mössbauer spectra were reproduced using two paramagnetic interactions, one corresponding to Fe2+ (δ~0.87 mms-1) and the other to Fe3+ (δ~0.31 mms-1). Magnetometric measurements showed the presence of paramagnetic and ferromagnetic like interactions at room temperature.