A micro-Raman study of iron-titanium oxides obtained by sol-gel synthesis

Iron-Titanium mixed oxides in powders and thin films on glass substrates have been prepared at different composition by using the sol-gel method. The thermal evolution, revealing the formation of different crystalline phases, has been followed by means of the micro-Raman spectroscopy. Pseudobrookite was the only crystalline phase found involving both iron and titanium. The differences in the thermal behavior between powders and films and the influence of iron as impurity in the crystallization process of the titania were also studied. (C) 2000 Kluwer Academic Publishers.