Properties and structure of vitreous silica. II

Brückner, R.

doi:10.1016/0022-3093(71)90032-9

Cited by 162 publications

(95 citation statements)

References 57 publications

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“…Vitreous silica exhibits numerous anomalies, e.g., anomalous thermal expansion, volume relaxation (Brückner, 1971), and liquid-liquid transition (Lascaris et al, 2014). Now we also see the anomalous enthalpy relaxation caused by repeating the heating-cooling circle.…”

Section: Glass Transition Temperature Of Vitreous Silicamentioning

confidence: 99%

“…Keywords: vitreous silica, glass transition temperature, enthalpy relaxation, hyperquenching, annealing introduction Vitreous silica is of special importance for advanced technology, e.g., for communication and semiconductor technologies, due to its excellent mechanical, thermal, and optical properties simultaneously connected with excellent chemical resistance (Bateson, 1958;Thomas, 1958;Brückner, 1971;Doremus, 2002;Mei et al, 2007;Lascaris et al, 2014). Despite its simple chemical identity, vitreous silica is one of the most interesting and complicated glass formers regarding its structure, dynamics, and properties.…”

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confidence: 99%

“…Despite its simple chemical identity, vitreous silica is one of the most interesting and complicated glass formers regarding its structure, dynamics, and properties. In a review paper (Brückner, 1971), Brückner has described physical anomalies of vitreous silica with regard to the volume relaxation, thermal expansion, specific heat capacity, and transport phenomena. The diffusion and viscous flow in silica have been discussed by Doremus (2002).…”

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Anomalous Enthalpy Relaxation in Vitreous Silica

Yue

2015

Front. Mater.

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It is a challenge to calorimetrically determine the glass transition temperature (Tg) of vitreous silica. Here, we demonstrate that this challenge mainly arises from the extremely high sensitivity of the Tg to the hydroxyl content, but also from decrease of the Tg with repeating the calorimetric scans. It is known that the liquid fragility (i.e., the speed of the viscous slow-down of a supercooled liquid at its Tg during cooling) has impact on enthalpy relaxation in glass. Here, we find that vitreous silica (as a strong system) exhibits striking anomalies in both glass transition and enthalpy relaxation compared to fragile oxide systems. The anomalous enthalpy relaxation of vitreous silica is discovered by performing the hyperquenching-annealing-calorimetry experiments. We argue that the strong systems like vitreous silica and vitreous Germania relax in a structurally cooperative manner, whereas the fragile ones do in a structurally independent fashion. We discuss the origin of the anomalous enthalpy relaxation in the HQ vitreous silica.

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Section: Glass Transition Temperature Of Vitreous Silicamentioning

confidence: 99%

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Anomalous Enthalpy Relaxation in Vitreous Silica

Yue

2015

Front. Mater.

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“…1). The Euler-Bernoulli analytical model of a beam [24] is used to compute the beam forces and torques on the discrete elements connected to this beam ((1), (2), (3) and (4)). Hereafter, the subscript "µ" denotes microscopic quantities.…”

Section: Elasticitymentioning

confidence: 99%

“…pressure and fictive temperature). Of particular interest is silica glass which is known to exhibit anomalous behavior in its thermal and mechanical properties [1,2]. Furthermore, certain properties of this type of glass such as the Young's and shear moduli and the density show an anomalous dependence on the fictive temperature.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Vickers indentation of silica glass

Jebahi

Debenath

Dau

et al. 2013

Journal of Non-Crystalline Solids

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractThe indentation response of glasses can be classified under three headings: normal, anomalous and intermediate, depending on the deformation mechanism and the cracking response. Silica glass, as a typical anomalous glass, deforms primarily by densification and has a strong tendency to form cone cracks that can accompany median, radial and lateral cracks when indented with a Vickers tip. This is due to its propensity to deform elastically by resisting plastic flow. Several investigations of this anomalous behavior can be found in the literature. The present paper serves to corroborate these results numerically using the discrete element method. A new pressuredensification model is developed in this work that allows for a quantitative estimate of the densification under very high pressure. This model is applied to simulate the Vickers indentation response of silica glass under various indentation forces using the discrete element method first, and then a discrete-continuum coupling method with large simulation domains to suppress the side effects and reduce the computational time. This coupling involves the discrete element method (DEM) and the constrained natural element method (CNEM). The numerical results obtained in this work compare favorably with past experimental results.

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Bibliography

2015

Discrete‐Continuum Coupling Method to Simulate Highly Dynamic Multi‐Scale Problems

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Properties and structure of vitreous silica. II

Cited by 162 publications

References 57 publications

Anomalous Enthalpy Relaxation in Vitreous Silica

Anomalous Enthalpy Relaxation in Vitreous Silica

Simulation of Vickers indentation of silica glass

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