CobaltMaghrebV1, France, Analysis, bibRecord, 000047

Heat treatment effect on the physical properties of cobalt doped TiO2 sol-gel materials

Identifieur interne : 000047 ( France/Analysis ); précédent : 000046; suivant : 000048

Heat treatment effect on the physical properties of cobalt doped TiO2 sol-gel materials

Auteurs : L. Samet [Tunisie] ; J. Ben Nasseur [Tunisie] ; R. Chtourou [Tunisie] ; K. March [France] ; O. Stephan [France]

Source :

Materials characterization [ 1044-5803 ] ; 2013.

RBID : Pascal:14-0022698

Descripteurs français

Pascal (Inist)
- Traitement thermique, Propriété physique, Dopage, Oxyde de titane, Procédé sol gel.
Wicri :
- topic : Dopage.

English descriptors

KwdEn :
- Doping, Heat treatments, Physical properties, Sol-gel process, Titanium oxide.

Abstract

Cobalt doped and undoped TiO₂ powders have been prepared by sol-gel technique and annealed at temperatures ranging from 400 °C to 1000 °C. The effects of annealing temperature on the structural, morphological and optical properties have been characterized by X-ray diffraction, transmission electron microscopy, electron energy-loss spectroscopy and diffuse reflectance spectroscopy. For all doped samples there is a general reduction of the band gap energy, in comparison with undoped samples prepared in the same conditions. More specifically, experimental results indicate that cobalt doping, occurring as Co²⁺ ion insertion into the TiO₂ (Ti⁴⁺) host lattice, inhibits the growth of the crystallites and delays the phase transformation from anatase to rutile. Moreover, at high temperature, a secondary phase (CoTiO₃) is found to coexist with highly crystalline rutile. These structural characteristics are discussed in relation with the observed general trends for the optical properties.

Affiliations:

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to stream Main, to step Exploration: 000339
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Pascal:14-0022698

Le document en format XML

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<front><div type="abstract" xml:lang="en">Cobalt doped and undoped TiO<sub>2</sub>
 powders have been prepared by sol-gel technique and annealed at temperatures ranging from 400 °C to 1000 °C. The effects of annealing temperature on the structural, morphological and optical properties have been characterized by X-ray diffraction, transmission electron microscopy, electron energy-loss spectroscopy and diffuse reflectance spectroscopy. For all doped samples there is a general reduction of the band gap energy, in comparison with undoped samples prepared in the same conditions. More specifically, experimental results indicate that cobalt doping, occurring as Co<sup>2+</sup>
 ion insertion into the TiO<sub>2</sub>
 (Ti<sup>4+</sup>
) host lattice, inhibits the growth of the crystallites and delays the phase transformation from anatase to rutile. Moreover, at high temperature, a secondary phase (CoTiO<sub>3</sub>
) is found to coexist with highly crystalline rutile. These structural characteristics are discussed in relation with the observed general trends for the optical properties.</div>
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Heat treatment effect on the physical properties of cobalt doped TiO2 sol-gel materials

Heat treatment effect on the physical properties of cobalt doped TiO2 sol-gel materials

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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