Kinetics of the anatase-rutile transformation in TiO2 in the presence of Fe2O3

The anatase–rutile phase transition in TiO2 in the presence of Fe2O3 was investigated in air and argon atmospheres by means of X-ray diffraction and scanning electron microscopy. Isothermal curves of rutile transformed from anatase as a function of time were obtained between 825 and 950 °C. The data...

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Published in:Journal of materials science 1998, Vol.33 (6), p.1571-1578
Main Authors: GENNARI, F. C, PASQUEVICH, D. M
Format: Article
Language:English
Subjects:
Anatase
Argon
Atmospheres
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
Exact sciences and technology
Materials science
Phase transitions
Physics
Rutile
Scanning electron microscopy
Structure of solids and liquids
crystallography
Titanium dioxide
Transition temperature
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PASQUEVICH, D. M
description The anatase–rutile phase transition in TiO2 in the presence of Fe2O3 was investigated in air and argon atmospheres by means of X-ray diffraction and scanning electron microscopy. Isothermal curves of rutile transformed from anatase as a function of time were obtained between 825 and 950 °C. The data were well fitted by various rate laws. In the presence of Fe3+, the anatase–rutile transition temperature is lower and the transformation rate in air is higher than the corresponding one in pure TiO2. The transformation in the presence of Fe3+ in an argon atmosphere is more rapid than in air. The enhancement effect of Fe3+ on the anatase–rutile transformation in both atmospheres is understood on the basis of the formation of oxygen vacancies.
doi_str_mv 10.1023/A:1017515804370
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subjects Anatase
Argon
Atmospheres
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
Exact sciences and technology
Materials science
Phase transitions
Physics
Rutile
Scanning electron microscopy
Structure of solids and liquids
crystallography
Titanium dioxide
Transition temperature
title Kinetics of the anatase-rutile transformation in TiO2 in the presence of Fe2O3
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