Optical absorption and fluorescent behaviour of titanium ions in silicate glasses

Kumar, Manoj; Uniyal, Aman; Chauhan, Arvind; Singh, Shweta

doi:10.1007/bf02707456

Cited by 32 publications

(11 citation statements)

References 17 publications

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“…It has also been verified that although natural hectorite presents a similar blue emission often attributed to [SiO 2 ] 2− centers, it has different luminescence features than have been observed for halogen-hectorites [24]. Also, previous reports have shown that Ti species can occur as impurities in silicates, generating similar emission features as reported for silicate glasses [54], fluorohectorites [23] and chlorohectorites [24]. The materials studied in the current work have low contents of Ti, confirmed from their respective XRF spectra (Figure 2).…”

Section: Appl Sci 2017 7 1243supporting

confidence: 53%

Synthesis and Features of Luminescent Bromo- and Iodohectorite Nanoclay Materials

et al. 2017

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Abstract:The smectites represent a versatile class of clay minerals with broad usage in industrial applications, e.g., cosmetics, drug delivery, bioimaging, etc. Synthetic hectorite Na 0.7 (Mg 5.5 Li 0.3 ) [Si 8 O 20 ](OH) 4 is a distinct material from this class due to its low-cost production method that allows to design its structure to match better the applications. In the current work, we have synthesized for the first time ever nanoclay materials based on the hectorite structure but with the hydroxyl groups (OH − ) replaced by Br − or I − , yielding bromohectorite (Br-Hec) and iodohectorite (I-Hec). It was aimed that these materials would be used as phosphors. Thus, OH − replacement was done to avoid luminescence quenching by multiphonon de-excitation. The crystal structure is similar to nanocrystalline fluorohectorite, having the d 001 spacing of 14.30 Å and 3 nm crystallite size along the 00l direction. The synthetic materials studied here show strong potential to act as host lattices for optically active species, possessing mesoporous structure with high specific surface area (385 and 363 m 2 g −1 for Br-Hec and I-Hec, respectively) and good thermal stability up to 800 • C. Both materials also present strong blue-green emission under UV radiation and short persistent luminescence (ca. 5 s). The luminescence features are attributed to Ti 3+ /Ti IV impurities acting as the emitting center in these materials.

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Section: Appl Sci 2017 7 1243supporting

confidence: 53%

Synthesis and Features of Luminescent Bromo- and Iodohectorite Nanoclay Materials

et al. 2017

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“…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: 87%

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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“…Samples from the 2nd Series deviate a little from series 1-3, indicating that CaO might affect the Urbach energy, as well. Kumar et al [48] also found that the absorption edge obeys the Urbach rule at low TiO 2 additions (0.1 wt%), however, no Urbach energy data were given. The Urbach energy has not frequently been determined, however, Abdel-Baki et al [13], determined the Urbach energy values for some glasses in the TiO 2 -Na 2 O-SiO 2 ternary.…”

Section: Optical Absorption and Absorption Edgementioning

confidence: 98%

Effect of TiO_2 on optical properties of glasses in the soda-lime-silicate system

Karlsson¹,

Bäck²,

Kidkhunthod³

et al. 2016

Opt. Mater. Express

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Titania is widely considered as an alternative constituent for replacing heavy metal oxides in optical glasses. Its effect on optical properties, however, is complex. This is due to the dielectric properties of the prevalent ionic species, Ti 4+ , the potential co-existence of trivalent titanium, Ti 3+ , giving rise to intrinsic and extrinsic charge transfer reactions, and the existence of different coordination polyhedra, depending on matrix composition. Here, we present a systematic study of the optical properties of the soda-lime-silicate glass system as a function of TiO 2 addition. We consider the silica-rich region of the SiO 2 -Na 2 O-CaO-TiO 2 quaternary, which may be taken as model for a variety of technical glasses. Trends are described in the refractive index, the Abbe number, the optical bandgap and the Urbach energy. The addition of TiO 2 increases the refractive index and the optical dispersion while it lowers the optical bandgap and the Urbach Energy. Results are discussed in relation to relevant literature data towards using titania silicate glasses as high-index replacements for heavy metalcontaining oxide glasses. (Springer-Verlag, 1992 719-724 (1989). 9. R. C. Turnbull and W. G. Lawrence, "The Role of Titania in Silica Glasses," J. Am. Ceram. Soc. 35(2), 48-53 (1952). 10. C. A. Hogarth and M. N. Khan, "A study of optical absorption in some sodium titanium silicate glasses," J. NonCryst. Solids 24(2), 277-281 (1977). 11. M. Villegas, A. de Pablos, and J. F. Navarro, "Caracterización de vidrios del sistema Na 2 O-TiO 2 -SiO 2 ," Bol. Soc. References F. Gan, Optical and Spectroscopic Properties of GlassEsp. Ceram. Vidr. 33(1), 23-28 (1994). 1921-1958 (2005). 44. F. Farges, G. E. Brown, Jr., A. Navrotsky, H. Gan, and J. J. Rehr, "Coordination chemistry of Ti(IV) in silicate glasses and melts: II. Glasses at ambient temperature and pressure," Geochim. Cosmochim. Acta 60(16), 3039-3053 (1996). 45. F. Farges, G. E. Brown, Jr., and J. J. Rehr, "Coordination chemistry of Ti (IV) in silicate glasses and melts: I.XAFS study of titanium coordination in oxide model compounds," Geochim. Cosmochim. Acta 60(16), 3023-3038 (1996). #257129Received 13 XANES studies of synthetic and natural volcanic glasses and tektites at ambient temperature and pressure," Geochim. Cosmochim. Acta 61(9), 1863-1870 (1997). 47. F. Farges, "A Ti K-edge EXAFS study of the medium range environment around Ti in oxide glasses," J. NonCryst. Solids 244(1), 25-33 (1999 373-410 (1976). 50. J. A. Duffy, "Electronic polarisability and related properties of the oxide ion," Phys. Chem. Glasses 30(1), 1-4 (1989). 51. V. Dimitrov and T. Komatsu, "Classification of oxide glasses: A polarizability approach," J. Solid State Chem.178(3), 831-846 (2005). 52. C. W. Ponader, H. Boek, and J. E. Dickinson, Jr., "X-ray absorption study of the coordination of titanium in sodium-titanium-silicate glasses," J. Non-Cryst. Solids 201(1-2), 81-94 (1996). 53. E. Fargin, A. Berthereau, T. Cardinal, G. Le Flem, L. Ducasse, L. Canioni, P. Segon...

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Optical absorption and fluorescent behaviour of titanium ions in silicate glasses

Cited by 32 publications

References 17 publications

Synthesis and Features of Luminescent Bromo- and Iodohectorite Nanoclay Materials

Synthesis and Features of Luminescent Bromo- and Iodohectorite Nanoclay Materials

Optical properties of Ce–Ti-containing silicate glasses

Effect of TiO_2 on optical properties of glasses in the soda-lime-silicate system

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