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Preparation and Nonstoichiometric Property of wide Compositional Fe(III)-doped TiO2 (anatase)

Published online by Cambridge University Press:  31 January 2011

N. Uekawa ,
Y. Kurashima ,
K. Kakegawa  and
Y. Sasaki
N. Uekawa*
Affiliation:
Department of Material Technology, Faculty of Engineering, Chiba University, 1–33 Yayoi-cho, Inage-ku, Chiba-shi, 263, Japan
Y. Kurashima
Affiliation:
Department of Material Technology, Faculty of Engineering, Chiba University, 1–33 Yayoi-cho, Inage-ku, Chiba-shi, 263, Japan
K. Kakegawa
Affiliation:
Department of Material Technology, Faculty of Engineering, Chiba University, 1–33 Yayoi-cho, Inage-ku, Chiba-shi, 263, Japan
Y. Sasaki
Affiliation:
Department of Material Technology, Faculty of Engineering, Chiba University, 1–33 Yayoi-cho, Inage-ku, Chiba-shi, 263, Japan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

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 held at a constant temperature for 2 h. Fe(III) ions completely dissolved into TiO2 (anatase), forming Fe(III)-doped TiO2 (anatase), in the composition range of 0 ⩽ Fe/Ti ⩽ 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)-doped TiO2 (anatase) were examined. The activation energy of electronic conduction decreased with an increase of the doped amount of Fe(III) ions. The x-ray photoelectron spectroscopy result showed that the electron density on the Ti ion in the Fe(III)-doped TiO2 (anatase) was decreased by the Fe(III) doping.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 4 , April 2000 , pp. 967 - 973
Copyright
Copyright © Materials Research Society 2000

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