Preparation and nonstoichiometric property of wide compositional Fe(III)-doped TiO2 (anatase)

Fe(III)-doped TiO2 (anatase) was prepared by the oxidation of FexTiS2. Two calcination methods were used to oxidize FexTiS2. In the first, sulfide was calcined in air at a given temperature for 2 h. In the second method, the sulfide was heated in air at a finite heating rate (2.5 K/min) and then hel d at a constant temperature for 2 h. Fe(III) ions completely dissolved into TiO2 (anatase), forming Fe(III)-doped TiO2 (anatase), in the composition r ange of 0 less than or equal to Fe/Ti less than or equal to 0.3 (mole ratio ). The properties of the obtained oxide depended on the oxidation method of FexTiS2. The electronic property and the valence stage of the Fe(III)-dope d TiO2 (anatase) were examined. The activation energy of electronic conduct ion decreased with an increase of the doped amount of Fe(III) ions. The x-r ay photoelectron spectroscopy result showed that the electron density on th e Ti ion in the Fe(III)-doped TiO2 (anatase) was decreased by the Fe(III) d oping.