Density of vitreous silica

Shelby, J. E.

doi:10.1016/j.jnoncrysol.2004.08.206

Cited by 87 publications

(99 citation statements)

References 16 publications

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“…However this fictive temperature range is dependent on the choice of the potential. Useful potentials should be chosen so that different inherent structures are selected in the range of say ~1300 -2300 o K , a range over which changes in density 37 and other fictive temperature dependent properties, such as, the Raman bands have been measured 38 .…”

Section: Modelmentioning

confidence: 99%

Silica molecular dynamic force fields—A practical assessment

Soules

Gilmer

Matthews

et al. 2011

Journal of Non-Crystalline Solids

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Section: Modelmentioning

confidence: 99%

Silica molecular dynamic force fields—A practical assessment

Soules

Gilmer

Matthews

et al. 2011

Journal of Non-Crystalline Solids

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“…The phase diagram (Fig. 2) for low OH content type I and II silicas shows 15 , 16 that specific volume first decreases and then increases (material becomes less dense) as the temperature is lowered at some rate. At some point, the structure essentially becomes frozen in.…”

Section: Volume Change Due To Structural Relaxationmentioning

confidence: 99%

“…Here the 's are components of the stress, 's are components of the strain, E is Young's modulus,  is Poisson's ratio. The quantity ΔT f is the change in fictive temperature from that at infinity and γ is a measured 16 coefficient that relates fictive temperature to dilation.…”

Section: Volume Change Due To Structural Relaxationmentioning

confidence: 99%

Densification and residual stress induced by CO 2 laser-based mitigation of SiO 2 surfaces

et al. 2010

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Knowing the ultimate surface morphology resulting from CO 2 laser mitigation of induced laser damage is important both for determining adequate treatment protocols, and for preventing deleterious intensification upon subsequent illumination of downstream optics. Physical effects such as evaporation, viscous flow and densification can strongly affect the final morphology of the treated site. Evaporation is a strong function of temperature and will play a leading role in determining pit shapes when the evaporation rate is large, both because of material loss and redeposition. Viscous motion of the hot molten material during heating and cooling can redistribute material due to surface tension gradients (Marangoni effect) and vapor recoil pressure effects. Less well known, perhaps, is that silica can densify as a result of structural relaxation, to a degree depending on the local thermal history. The specific volume shrinkage due to structural relaxation can be mistaken for material loss due to evaporation. Unlike evaporation, however, local density change can be reversed by post annealing. All of these effects must be taken into account to adequately describe the final morphology and optical properties of single and multiple-pass mitigation protocols. We have investigated, experimentally and theoretically, the significance of such densification on residual stress and under what circumstances it can compete with evaporation in determining the ultimate post treatment surface shape. In general, understanding final surface configurations requires taking all these factors including local structural relaxation densification, and therefore the thermal history, into account. We find that surface depressions due to densification can dominate surface morphology in the non-evaporative regime when peak temperatures are below 2100K.

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“…Although the glass forming elements of two glasses are the same (SiO 2 ), the properties of the two glasses are quite different [36][37][38]. For example, the viscosity of silica glass at high temperature is more than four orders of magnitude larger than that of sodalime glass.…”

Section: Pump Energy-dependence Of a Pressure Wavementioning

confidence: 99%

“…This should be due to differences in the sound velocity in the glasses (5.93 km/s in a silica glass and 5.5 km/s in a sodalime glass), because the TrL oscillation is originated from the propagation of a pressure wave. To compare the amplitude of the TrL oscillation, we defined an oscillation amplitude (A osci ) as shown in Figure 4(c), that is, the difference of the signal intensity at [32,37], thermal expansion coefficients α [32,36], band gaps E g [6,39], refractive indices n [36], and glass transition temperatures T g [38] of silica glass and sodalime glass [32]. η (Pa·s) at 600…”

Section: Pump Energy-dependence Of a Pressure Wavementioning

confidence: 99%

Elastic and Thermal Dynamics in Femtosecond Laser-Induced Structural Change Inside Glasses Studied by the Transient Lens Method

et al. 2010

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A technique to study femtosecond laser induced structural change inside glasses, the transient lens (TrL) method, is described. Because the TrL method is sensitive to the refractive index change around the photoexcited region, the time dependence of the density, pressure, and temperature changes, which accompany refractive index change, can be monitored over a broad range of timescales. In the picosecond-nanosecond time range, the pressure wave generation was observed as an oscillating TrL signal. By comparing the TrL signal with that calculated based on thermoelastic simulation, the density, pressure, and temperature changes in the photoexcited region can be estimated. In the longer time range (nanoseconds-milliseconds), the thermal diffusion process was observed. By fitting the TrL signal with that simulated based on thermal diffusion, the temporal evolution of the temperature distribution was obtained. Based on these observations, the features of femtosecond laser-induced structural change inside glasses are revealed. The advantages of the TrL method are described.

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Density of vitreous silica

Cited by 87 publications

References 16 publications

Silica molecular dynamic force fields—A practical assessment

Silica molecular dynamic force fields—A practical assessment

Densification and residual stress induced by CO 2 laser-based mitigation of SiO 2 surfaces

Elastic and Thermal Dynamics in Femtosecond Laser-Induced Structural Change Inside Glasses Studied by the Transient Lens Method

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