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

Abstract

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...

Trends in Effective Diffusion Coefficients for Ion-Exchange Strengthening of Soda-Lime-Silicate Glasses

“…The electronic ionic polarizability is a measure of the effect that surrounding atoms in the vitreous network has on the dipole moment or orbital structure of the mobile species that we are considering. It is not just important for the optical properties (Karlsson et al, 2016) but also important for transport properties as electric fields are constantly changing as the ions diffuses in the glass (Frischat, 1975). The logarithm of the effective diffusion coefficient as a function of the electronic ionic polarizability is given in Figure 8, where Cu + fits into the trend with the alkali ions, while Ag + with relatively high polarizability has an unusually high effective diffusion.…”

Compositional Effects on Indentation Mechanical Properties of Chemically Strengthened TiO2-Doped Soda Lime Silicate Glasses

“…In both product examples, cover glass and wine glasses, damage resistance is beneficial for the product and both examples are topics that most people can relate to. TiO 2 is an interesting component for incorporation into silicate glass mainly owing to its optical properties [24][25][26][27][28][29][30][31]. It has been used as a coloring agent [32,33], UV-protective agent [34][35][36] and for tailoring optical properties for different applications, e.g., optical glasses and lead-free crystal glass [24,37].…”

Unravelling interrelations between chemical composition and refractive index dispersion of infrared-transmitting chalcogenide glasses

“…In view of Clausius-Mossotti relation, n of a non-absorbing dielectric material like glass would be specified in connection with both molar volume and polarizability of its constituent atoms. This implies that glass consisting of highly polarizable atoms that are relatively densely packed results in less free volume, and thereby tends to exhibit higher n values in general 4 – 6 . Empirical formulations (and thus derived equations) partly or fully based on the additivity principle have been suggested in an effort to establish compositional dependence of n and/or ν of optical glasses in the visible spectrum 7 .…”