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Issue 10, 2001
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Nanocrystalline iron-doped mesoporous titania and its phase transition

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Abstract

Nanocrystalline mesoporous iron-doped TiO2 was prepared as a single-phase product by a novel sol–gel technique. By transmission, scanning and analytical electron microscopy as well as by complementary techniques it has been found that the as-prepared solids exhibit a narrow size distribution and that the iron is homogeneously distributed in the TiO2 matrix. The influence of the iron concentration on the phase transformations of the doped TiO2 was investigated by X-ray diffractometry. The formation of the iron titanium oxide pseudobrookite, Fe2Ti2O5, was observed above 670 °C, but only for an iron content of more than 3 atom%. UV-spectroscopic measurements reveal that the absorption spectrum of the iron doped titania is sensitively related to both the iron concentration and the calcination temperature. Whereas pure nanocrystalline TiO2 undergoes grain growth (sintering) when the calcination temperature is increased, iron doped TiO2 proves to be inert to grain growth. N2 adsorption–desorption analysis indicated that the products calcined between 390 and 600 °C for 1 h in air have mesoporous structure and the distribution of mesopores is very narrow, centered at 3.7 nm.

Graphical abstract: Nanocrystalline iron-doped mesoporous titania and its phase transition

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Publication details

The article was received on 26 Apr 2001, accepted on 17 Jul 2001 and first published on 07 Sep 2001


Article type: Paper
DOI: 10.1039/B103818B
Citation: J. Mater. Chem., 2001,11, 2537-2541
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    Nanocrystalline iron-doped mesoporous titania and its phase transition

    Y. Zhang and A. Reller, J. Mater. Chem., 2001, 11, 2537
    DOI: 10.1039/B103818B

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