NDLI: Oxidation States of Iron in Doped TiO$_{2}$-SiO$_{2}$ Sol-Gel Powders: A $^{57}$Fe Mössbauer Study

Content Provider	SpringerLink
Author	Fallet, M. Gschwind, R. Bauer, Ph.
Copyright Year	2003
Abstract	Ceramic coatings obtained by sol-gel routes are more and more attractive for protective purposes. Improved resistance against wet corrosion of steels can be obtained by doping the covering layer with elements like for instance transition ones. It is of major importance to have a clear-cut knowledge of the oxidation state of the doping element, especially after different heat treatments which usually follow the deposition process. Here we report about the oxidation states of 5 wt.% iron doped TiO$_{2}$, SiO$_{2}$ and mixed sol powders obtained by the sol-gel method with alkoxide precursors added with FeSO$_{4}$, 7 H$_{2}$O in organic medium. The evolution of the Fe oxidation state versus various heat treatments is followed by $^{57}$Fe Mössbauer spectrometry supplemented by XRD data. As-dried samples are amorphous and contain ferric Fe cations, with a local distorted oxygen environment. After heating at 500°C during 3 min, ferrous and ferric oxides are evidenced together solely for silica and mixed silica-titania powders, in marked contrast with titania powders where only ferric species exist. The complete ferric state is restored for all samples after annealing at 900°C for one hour.
Starting Page	167
Ending Page	173
Page Count	7
File Format	PDF
ISSN	09280707
Journal	Journal of Sol-Gel Science and Technology
Volume Number	27
Issue Number	2
e-ISSN	15734846
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Boston
Access Restriction	Subscribed
Subject Keyword	Physical Chemistry Optical and Electronic Materials Characterization and Evaluation Materials Ceramics, Glass, Composites, Natural Methods Applied Optics, Optoelectronics, Optical Devices
Content Type	Text
Resource Type	Article
Subject	Biomaterials Electronic, Optical and Magnetic Materials Condensed Matter Physics Ceramics and Composites Materials Chemistry Chemistry

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