INVESTIGADORES
RODRIGUEZ TORRES Claudia Elena
artículos
Título:
The relationship between magnetic behaviour and local structure around Fe ions in Fe-doped TiO2 rutile.
Autor/es:
A.M.MUDARRANAVARRO; V.BILOVOL; A.F.CABRERA; C.E.RODRıGUEZ TORRES; F.H.SANCHEZ
Revista:
PHYSICA B - CONDENSED MATTER
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2009 vol. 404 p. 2838 - 2840
ISSN:
0921-4526
Resumen:
The magnetic and structural characterization of Ti1-xFexO2 (x =0.025,0.05,0.07,0.125, and 0.15) samples prepared by mechano-synthesisusing TiO2 and Fe2O3 as starting materials are reported. XANES measurements performed at the FeK- edge show that Fe ions are in 3+ oxidation state in the7at% Fe-doped sample an mixture of 2+ and 3+ oxidation states in the other samples. EXAFS results show the incorporation of Fe ions substituting Ti one sintherutile TiO2 structure. They also reveala strong correlation between the number of oxygen nearestneighbours and the Fe2+ fraction, i.e the number ofoxygen nearneighbours decreases when the Fe2+ fraction increases.All samples present ferromagnetic-like behaviour at room temperature.We found a clear dependence between saturation magnetization and coercivity with the fraction of Fe2+ and/or the number of Fe near neighbour oxygen vacancies.
