Thermal annealing and density fluctuations in silica glass

Parc, Rozenn Le; Champagnon, B.; Guénot, P.; Dubois, Sébastien

doi:10.1016/s0022-3093(01)00835-3

Cited by 38 publications

(40 citation statements)

References 12 publications

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“…Raman room temperature measurements for silica have been reported before [3,10]. Larger scale structure fluctuations at the nanometer scale are investigated up to 700°C (1500°C for silica) using Small Angle X-ray Scattering (SAXS) on D2AM instrument at ESRF (Grenoble, France), with an incident energy E = 18 keV, using a molybdenum furnace [11].…”

Section: Methodsmentioning

confidence: 99%

Influence of thermal history on the structure and properties of silicate glasses

Levelut¹,

Faivre²,

Champagnon³

2006

Journal of Non-Crystalline Solids

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We studied a set of float glass samples prepared with different fictive temperatures by previous annealing around the glass transition temperature. We compared the results to previous measurements on a series of amorphous silica samples, also prepared with different fictive temperatures. We showed that the modifications on the structure at a local scale are very small, the changes of physical properties are moderate but the changes on density fluctuations at a nanometer scale are rather large: 12% and 20% in float glass and silica, for relative changes of fictive temperature equal to 13% and 25% respectively. Local order and mechanical properties of silica vary in the opposite way compared to float glass (anomalous behavior) but the density fluctuations in both glasses increase with temperature and fictive temperature.

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Section: Methodsmentioning

confidence: 99%

Influence of thermal history on the structure and properties of silicate glasses

Levelut¹,

Faivre²,

Champagnon³

2006

Journal of Non-Crystalline Solids

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“…Typical composition dependences of Landau-Placzek ratio and its constituents are presented in Fig. 4 [22]. As follows from Fig.4, composition range of low scattering glasses due to the minimum contribution from "frozen-in" concentration fluctuations into Landau-Placzek ratio correlates with glass compositions enriched by CSGs Na 2 O 4B 2 O 3 .…”

Section: Light Scattering Lossesmentioning

confidence: 74%

“…Fig. 6 shows composition dependencies of Landau-Placzek ratio in commercial flint glasses and experimental Na 2 O-B 2 O 3 -SiO 2 doped with Nb [22]. As follows from Fig.6, lowering of alkali content in glass hosts leads to the enhancing Landau-Placzek ratio that is explained by selective entering of heavy metal ions into alkali enriched fluctuation concentrations of glass melts (so-called the dopant segregation phenomenon) [24,25].…”

Section: Light Scattering Lossesmentioning

confidence: 91%

Inhomogeneous structure of inorganic glasses studied by Rayleigh, Mandel'shtam-Brillouin, Raman scattering spectroscopy, and acoustic methods

Maksimov¹,

Anan’ev²,

Bogdanov

et al. 2011

IOP Conf. Ser.: Mater. Sci. Eng.

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Inhomogeneous structure of inorganic glasses studied by Rayleigh, Mandel'shtam-Brillouin, Raman scattering spectroscopy, and acoustic methods Abstract. General features of inhomogeneous structure characteristic of inorganic glasses are analyzed on the base of results of combined application of light scattering spectroscopy and high temperature acoustic methods. In the framework of the model of "freezing" equilibrium thermodynamic fluctuations of melt the glass composition dependences of Landau-Placzek ratios taken from Rayleigh and Mandel'shtam-Brillouin scattering (RMBS) spectra and high temperature acoustics data for glass melts make it possible to estimate separately the relative role of "frozen-in" density and concentration fluctuations in the intensity of Rayleigh scattering (RS) by glasses. The obtained data opens the way to elaboration of glasses of the highest chemical and/or optical homogeneity for fiber and laser optics. It was found that Rayleigh scattering is sensitive to the selective entering of doped ions into concentration fluctuations of a glass host (the so-called dopant segregation phenomenon). Thus, RMBS data allows controlling the real dopant-dopant separations in glasses that are significant for the elaboration of laser glasses. Being carefully measured, the intensities of Raman scattering spectral bands can be used for the determination of concentrations and partial properties of constant stoichiometry groups (CSG) from which some binary glass forming systems are built.Comparison of RMBS and Raman scattering data leads to the conclusion that concentration fluctuations in some binary glass forming systems can be considered as fluctuations of CSGs. The result can be used for the elaboration of EO glasses with minimized RS losses.

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“…For this silica glass, which will be called silica A in the following, several samples with different well defined thermal histories were prepared by thermal annealing in the glass transition range, as previously described . Spectroscopic features sensitive to the thermal history (Agarwal & Tomozawa, 1995;Geissberger & Galeener, 1983) were measured to check that the thermal heat treatment at a fixed temperature had been long enough to ensure the 'stabilization' of the glass structure (Champagnon et al, 2000;Le Parc et al, 2001). It is convenient to characterize simple thermal histories (such as stabilization by thermal annealing in the glass transition range and fast quenching) by the fictive temperature, T f , introduced by Tool & Eichlin (1931), at which the structure is frozen in.…”

Section: Samples and Experimentsmentioning

confidence: 99%

Density fluctuations in oxide glasses investigated by small-angle X-ray scattering

et al. 2007

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The structure of glasses is characterized by the existence of density and composition fluctuations on the nanometre scale. We present three examples of the use of small-angle X-ray scattering to get information about these density fluctuations. The thermal history and OH content were observed to have a huge influence. The static compressibility decreases when the OH content or fictive temperature increase. We showed that temperature scanning small-angle X-ray scattering can provide an accurate description of the position, width and shape of the glass transition.

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Thermal annealing and density fluctuations in silica glass

Cited by 38 publications

References 12 publications

Influence of thermal history on the structure and properties of silicate glasses

Influence of thermal history on the structure and properties of silicate glasses

Inhomogeneous structure of inorganic glasses studied by Rayleigh, Mandel'shtam-Brillouin, Raman scattering spectroscopy, and acoustic methods

Density fluctuations in oxide glasses investigated by small-angle X-ray scattering

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