Formation of the structure of cerium oxide-modified titanium dioxide

Зенковец, Г. А.; Шутилов, А. А.; Gavrilov, V. Yu.; Tsybulya, S. V.; Kryukova, G. N.

doi:10.1134/s0023158407050205

Cited by 18 publications

(18 citation statements)

References 14 publications

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“…Furthermore, its spectrum was very different from the others in the studied wavelength range. Such absorption was not observed in all other spectra (with non-zero CeO 2 content, samples [1][2][3][4][5][6][7][8]. This indicates that all Ti is present in the tetravalent state or forms very small quantities of Ti 3+ ions that do not have a noticeable effect on the shape of the spectrum if both TiO 2 and CeO 2 are present.…”

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confidence: 44%

“…It can be concluded that the effective PL of Ce ions in glasses was regulated by the CeO 2 /TiO 2 ratio in them. It was concluded that Ti was present mainly in the tetravalent state according to the results for samples of Ce-Ti-containing glasses (2)(3)(4)(5)(6)(7)(8) and the literature [30][31][32]. Luminescence in the range 500-560 nm that is noticeably different from that at longer wavelength for Ti 3+ ions is characteristic of Ti 4+ ions.…”

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confidence: 88%

“…[1][2][3][4][5][6]; Series 2, with constant content of TiO 2 (15 mass%) and variable CeO 2 (samples No. [6][7][8][9]. Table 1 lists the content of CeO 2 and TiO 2 in the samples.…”

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confidence: 99%

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Optical properties of Ce–Ti-containing silicate glasses

et al. 2009

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UDC 666.175.6;621.794.5;535.37 Silicate glasses doped with ceria and titania have been studied. Such co-doping determines the specific coloration of the glasses with adjustable absorption in the visible spectral region. Based on measurements of optical transmittance and photoluminescence and studies of electron paramagnetic resonance, it was established that the features of their optical properties are due to the formation of chromophore centers incorporating cerium and titanium ions.Introduction. Optical materials containing transition and rare-earth ions are widely used in optics and quantum electronics to fabricate laser glasses that are stable to the action of UV radiation and to develop thermally stable light filters, etc. Interest in the use of Ce and Ti compounds in optical materials grew because of their use to prepare yellowish-orange glasses with consistent optical characteristics and high thermal stability [1]. Such glasses are used to fabricate various items for household and technical purposes and to imitate precious stones. It is important to establish the nature of the coloring effect and the valence and coordination state of the Ce and Ti ions in glasses used as filters for light emitters in the electrical industry because the optical characteristics must be controlled and stabilized.Optical properties of glasses with both Ce and Ti oxides present in various proportions (silicate, phosphate, borate glasses and thin films) have been studied several times [2][3][4]. However, there are significant discrepancies in the explanation of the nature of the coloring and the determination of the valence state of the Ce and Ti ions in the glass matrix. According to one study [2], compounds such as Ce(TiO 3 ) 2 and Ce(Ti 2 O 5 ) 2 with tetravalent Ce and Ti are formed. Another study [3] explains the yellow color by the effect of Ce and Ti ions on the total optical absorption. Yet another study [4] linked the appearance of the characteristic yellowish-orange color in silicate glasses with Ce and Ti to the formation of colored complexes between Ce 3+ and Ti 4+ ions. The involvement of both CeO 2 and TiO 2 in

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confidence: 44%

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confidence: 88%

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Optical properties of Ce–Ti-containing silicate glasses

et al. 2009

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“…Spectroscopic results strongly demonstrated that the surface region of CeO 2 -TiO 2 mixed oxide is enriched with TiO 2 . According to Zenkovets et al [38] the modification of titanium dioxide (anatase) with cerium oxide changes the properties of the initial material through the formation of nanostructured anatase Ce Ti O compounds that consist of incoherently intergrown fine TiO 2 crystallites and are separated by interblock (intercrystallite) boundaries stabilising cerium ions. This stabilisation is possible owing to the fact that the TiO 2 crystal structure at the interblock boundaries is disordered.…”

Section: Kineticsmentioning

confidence: 99%

Photocatalytic oxidation of benzene, toluene, ethylbenzene and m-xylene in the gas-phase over TiO2-based catalysts

Korologos

Nikolaki

Zerva

et al. 2012

Journal of Photochemistry and Photobiology A: Chemistry

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“…Binary V Ti O catalysts were prepared by spray drying of a mixture of titanium dioxide (anatase form) and vanadyl oxalate solution followed by calcination in a flowing air at 400-500 • C for 4 h. Vanadium oxide (99.9%, Sigma-Aldrich) was calcinated at 450 C for 4 h. A detailed description of catalysts preparation and characterization can be found in [16][17][18][19][20][21][22][23].…”

Section: Catalyst Preparation and Characterizationmentioning

confidence: 99%