Structure of vanadium tellurite glasses studied by neutron and X-ray diffraction

Hoppe, Uwe; Yousef, El Sayed; Rüssel, Christian; Neuefeind, J.; Hannon, Alex C.

doi:10.1016/s0038-1098(02)00303-4

Cited by 47 publications

(74 citation statements)

References 24 publications

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“…3. The tellurium atom in TeO 2 is in the vicinity of six oxygen atoms, and the Te -O distances are 2.05, 2.07, 2.12, 2.20, 2.68, and 2.79 Å [9]. Acceding to the data from this study, there is also significant anisotropy of the tellurium oxide polyhedrons in tellurite glasses, in which the Te -O distances vary from 2.05 to 2.80 Å.…”

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confidence: 57%

Structure and properties of erbium-titanium-tellurite glass

et al. 2006

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The structure of glasses of the compositions xEr 2 O 3 -2xTiO 2 -(100 -3x )TeO 2 was investigated and the glass formation region, situated in the range of 2 < x < 7 was established. The possibility of increasing the glass transition temperature and consequently the thermal stability of erbium tellurite glass by doping with titanium (IV) oxide was demonstrated.The number of publications on development and investigation of active media based on tellurite glasses has increased significantly in recent years. This is because TeO 2 glass has high refractive indexes (n > 2.0), high transparency, including in the near IR region of the spectrum (0.35 -6.00 mm) [1], the possibility of varying the compositions of the glass within wide limits, and higher solubility of the cations of rare-earth elements in comparison to quartz glass. The last two circumstances allow obtaining a much broader luminescence band of Er 3+ (about 80 nm) in fibers made of tellurite glass than with quartz fibers (about 35 nm) [1, 2], which is necessary for simultaneously enhancing some signals in current WDM (wavelength-division multiplexing) networks. For this reason, broad-band fiber amplifiers based on tellurite glass with Er 3+ dopants are now being actively developed [1 -3]. The main drawback of tellurite glass, which is related to the low glass transition temperature (about 290°C) and prevents it from being used in conditions of intensive radiation, can be partially eliminated by complicating the composition of the glass and doping with high-melting oxides, for example, WO 3 , Nb 2 O 5 , etc. [1 -3].For this reason, the system Er 2 O 3 -TiO 2 -TeO 2 (ETT) is of special interest. The high-melting oxides (Er 2 O 3 and TiO 2 ) in it makes the possibility of developing new laser glasses that have high thermal stability and chemical resistance in comparison to the investigated analogs of laser tellurite glasses very attractive. In addition, the possibility of separating active Er 2 Ti 2 O 7 crystals with the structure of pyrochlore and the fluorite-like phase Er 2 Te 5 O 13 , which has been studied very little, in the glasses of this system offers new prospects for developing glass ceramic materials with a high Er 3+ content (> 5´10 20 cm -3 ) and improved luminescence characteristics. Such materials are of great interest as the active elements of tunable and fiber lasers, laser microchips, and broadband signal amplifiers.However, almost nothing is known of glass formation in the ETT system. There is thus no information on the structure and crystallization of erbium-titanium-tellurite glasses and its effect on the luminescence-spectral properties.We synthesized and investigated glasses in which Er 2 O 3 : TiO 2 = 2, and the composition can be expressed by the general formula xEr 2 O 3 -2xTiO 2 -(100 -3x )TeO 2 . This ratio was selected for the purpose of subsequently fabricating glass ceramic materials containing Er 2 Ti 2 O 7 with the same Er 2 O 3 : TiO 2 ratio from these glasses.We found that transparent glasses in the xEr 2 O 3 -2xTiO 2 -(100 -3...

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confidence: 57%

Structure and properties of erbium-titanium-tellurite glass

et al. 2006

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“…The third equatorial position is occupied by a lone pair of electrons. If network modifying oxides, such as ZnO are added, non-bridging oxygens are formed and the TeO 4 trigonal bipyramids are transferred into TeO 3 trigonal pyramids (tp) [25][26][27][28][29]. Here, the lone pair occupies the apex of the sp 3 hybrid orbital.…”

Section: Discussionmentioning

confidence: 99%

Effect of ZnO and Bi2O3 addition on linear and non-linear optical properties of tellurite glasses

Yousef

Hotzel²,

Rüssel

2007

Journal of Non-Crystalline Solids

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“…The structural role of lead oxide in many oxide glasses is unique since lead oxide is known to play a dual role both as a network modifier and former [1,8,9]. This role depends on the type of bond between lead and oxide.…”

Section: Introductionmentioning

confidence: 99%

“…In normal glass system, the modifier atoms cause the network to break. In tellurate glasses, the modifier atoms cause the modification of the basic structural units such as [TeO 4 ] trigonal bipyramid and [TeO 3 ] trigonal pyramid with one of the equatorial position occupied by a lone pair of electrons [9].…”

Section: Introductionmentioning

confidence: 99%