Vibrational and structural properties of glass and crystalline phases of TeO2

Noguera, Olivier; Merle-Méjean, Thérèse; Mirgorodsky, A.P.; Smirnov, M. B.; Thomas, Philippe; Champarnaud-Mesjard, J.C.

doi:10.1016/j.jnoncrysol.2003.08.052

Cited by 117 publications

(86 citation statements)

References 15 publications

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“…1͒. These differences are similar to those reported between liquid TeO 2 and TeO 2 glass, 34 although less obvious in our case. They suggest that the glass network of the films is made by shorter TeO 2 chains with a higher concentration of terminal Te-O bonds than in the case of bulk glass.…”

Section: Discussionsupporting

confidence: 90%

Nonlinear optical susceptibility of multicomponent tellurite thin film glasses

Muñoz-Martín¹,

Fernández²,

Fernández-Navarro³

et al. 2008

Journal of Applied Physics

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Tellurite ͑TeO 2 -TiO 2 -Nb 2 O 5 ͒ thin film glasses have been produced by pulsed laser deposition. The dispersion of the real and imaginary parts of the linear refractive index has been measured in the range from 300 to 1700 nm. Films present high refractive index ͑n = 2.01͒ and reduced absorption ͑k Ͻ 10 −4 ͒ at = 1500 nm. The nonlinear third order optical susceptibility ͉͑ ͑3͒ ͉͒ has been determined at four different wavelengths ͑600, 800, 1200, and 1500 nm͒. The out-of-resonance ͉ ͑3͒ ͉ values ͑ϳ10 −12 esu͒ are found to be ten times higher than those of the bulk glass and 10 2 times higher than that of silica. Compositional and structural analysis reveals an increase of both the Ti atomic content and the fraction of nonbridging oxygen bonds in the deposited films. Both factors lead to a higher hyperpolarizability of the film constituents that is proposed to be responsible for the high ͉ ͑3͒ ͉ value of the films.

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Section: Discussionsupporting

confidence: 90%

Nonlinear optical susceptibility of multicomponent tellurite thin film glasses

Muñoz-Martín¹,

Fernández²,

Fernández-Navarro³

et al. 2008

Journal of Applied Physics

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“…Second, the addition of alkali and/or alkaline earth modifiers to pure TeO 2 network causes a change of the Te coordination polyhedron from TeO 4 tbp to TeO 3 trigonal pyramid (tp) in which one of the Te sp 3 hybrid orbitals is occupied by a lone pair of electrons (Sekiya et al 1992; Tatsumisago et al 1994a;Noguera et al 2003). Figure 1 shows the room temperature polarized and depolarized Raman spectra of 0⋅1Rb 2 O-0⋅9TeO 2 glass.…”

Section: Resultsmentioning

confidence: 99%

“…a broad band near 475 cm -1 , an intense band at ~ 670 cm -1 and a shoulder band near ~ 770 cm -1 . These bands have been attributed to the bending mode of Te-O-Te or O-Te-O linkages, to stretching modes of the TeO 4 tbp, to stretching mode of the TeO 3 tp units, respectively (Sekiya et al 1992;Tatsumisago et al 1994b;Noguera et al 2003). At lower frequencies the spectrum is dominated by a well resolved asymmetric peak, viz.…”

Section: Resultsmentioning

confidence: 99%

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Low-frequency Raman scattering in alkali tellurite glasses

Kalampounias

2008

Bull Mater Sci

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Raman scattering has been employed to study the alkali-cation size dependence and the polarization characteristics of the low-frequency modes for the glass-forming tellurite mixtures, 0⋅1M 2 O-0⋅9TeO 2 (M = Na, K, Rb and Cs). The analysis has shown that the Raman coupling coefficient alters by varying the type of the alkali cation. The addition of alkali modifier in the tellurite network leads to the conversion of the TeO 4 units to TeO 3 units with a varying number of non-bridging oxygen atoms. Emphasis has also been given to the lowfrequency modes and particular points related to the low-frequency Raman phenomenology are discussed in view of the experimental findings.

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“…The local structure of alkali M2O-TeO2 glasses (M = Li, Na, and K) has been studied extensively using neutron diffraction [1][2][3][4][5], X-ray diffraction [6,7], EXAFS [7,8], Raman scattering [7,9,10], NMR [2,[11][12][13] and RMC modelling [2,14]. In these studies, particular emphasis was placed on determining the local environment of tellurium and there is a general consensus that the average tellurium coordination number, nTeO, decreases as an oxide modifier is added to the glass network, the change being driven by the bonding requirements of the modifier.…”

Section: Introductionmentioning

confidence: 99%

Alkali environments in tellurite glasses

Barney

Hannon

Holland

et al. 2015

Journal of Non-Crystalline Solids

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Neutron diffraction measurements are reported for five binary alkali tellurite glasses, xM2O·(100-x)TeO2 (containing 10 and 20 mol% K2O, 10 and 19 mol% Na2O, and 20 mol% 7 Li2O), together with 23 Na MAS NMR measurements for the sodium containing glasses.Differences between neutron correlation functions are used to extract information about the local environments of lithium and sodium. The Na-O bond length is 2.37(1) Å and the average Na-O coordination number, nNaO, decreases from 5.2(2) for x=10 mol% Na2O to 4.6(1) for x=19 mol% Na2O. The average Li-O coordination number, nLiO, is 3.9(1) for the glass with x=20 mol% Li2O and the Li-O bond length is 2.078(2) Å. As x increases from 10 to 19 mol% Na2O, the 23 Na MAS NMR peak moves downfield, confirming an earlier report of a correlation of peak position with sodium coordination number. The close agreement of the maximum in the Te-O bond distribution for sodium and potassium tellurite glasses of the same composition, coupled with the extraction of reasonable alkali coordination numbers using isostoichiometric differences, gives strong evidence that the tellurium environment in alkali tellurites is independent of the size of the modifier cation used.

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Vibrational and structural properties of glass and crystalline phases of TeO2

Cited by 117 publications

References 15 publications

Nonlinear optical susceptibility of multicomponent tellurite thin film glasses

Nonlinear optical susceptibility of multicomponent tellurite thin film glasses

Low-frequency Raman scattering in alkali tellurite glasses

Alkali environments in tellurite glasses

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