Are the dynamics of silicate glasses and glass-forming liquids embedded in their elastic properties? Invited Talk

Publikation: Konferencebidrag uden forlag/tidsskriftKonferenceabstrakt til konferenceForskningpeer review

Resumé

According to the elastic theory of the glass transition, the dynamics of glasses and glass-forming liquids are controlled by the evolution of shear modulus. In particular, the elastic shoving model expresses dynamics in terms of an activation energy required to shove aside the surrounding atoms, which is determined by the shear modulus. First, we here present an in situ high-temperature Brillouin spectroscopy test of the shoving model near the glass transition of eight aluminosilicate glass-forming systems. We find that the measured viscosity data agree qualitatively with the measured temperature dependence of shear moduli, as predicted by the shoving model. However, the model systematically underpredicts the values of fragility. Second, we also present a thorough test of the shoving model for predicting the low temperature dynamics of an aluminosilicate glass system. This is done by measuring the nonequilibrium viscosity over a wide range of fictive temperatures. We show that the model systematically underpredicts the changes in nonequilibrium viscosity with fictive temperature when compared with experimental data. Hence, both set of experiments suggest that the dynamics of the silicate glass transition are governed by additional factors beyond the evolution of the shear modulus.
OriginalsprogEngelsk
Publikationsdato26 jul. 2013
StatusUdgivet - 26 jul. 2013
Begivenhed7th International Discussion Meeting on Relaxations in Complex Systems - Barcelona, Spanien
Varighed: 21 jul. 201326 jul. 2013

Konference

Konference7th International Discussion Meeting on Relaxations in Complex Systems
LandSpanien
ByBarcelona
Periode21/07/201326/07/2013

Citer dette

Smedskjær, M. M., & Mauro, J. C. (2013). Are the dynamics of silicate glasses and glass-forming liquids embedded in their elastic properties? Invited Talk. Abstract fra 7th International Discussion Meeting on Relaxations in Complex Systems, Barcelona, Spanien.
Smedskjær, Morten Mattrup ; Mauro, John C. / Are the dynamics of silicate glasses and glass-forming liquids embedded in their elastic properties? Invited Talk. Abstract fra 7th International Discussion Meeting on Relaxations in Complex Systems, Barcelona, Spanien.
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abstract = "According to the elastic theory of the glass transition, the dynamics of glasses and glass-forming liquids are controlled by the evolution of shear modulus. In particular, the elastic shoving model expresses dynamics in terms of an activation energy required to shove aside the surrounding atoms, which is determined by the shear modulus. First, we here present an in situ high-temperature Brillouin spectroscopy test of the shoving model near the glass transition of eight aluminosilicate glass-forming systems. We find that the measured viscosity data agree qualitatively with the measured temperature dependence of shear moduli, as predicted by the shoving model. However, the model systematically underpredicts the values of fragility. Second, we also present a thorough test of the shoving model for predicting the low temperature dynamics of an aluminosilicate glass system. This is done by measuring the nonequilibrium viscosity over a wide range of fictive temperatures. We show that the model systematically underpredicts the changes in nonequilibrium viscosity with fictive temperature when compared with experimental data. Hence, both set of experiments suggest that the dynamics of the silicate glass transition are governed by additional factors beyond the evolution of the shear modulus.",
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Smedskjær, MM & Mauro, JC 2013, 'Are the dynamics of silicate glasses and glass-forming liquids embedded in their elastic properties? Invited Talk' 7th International Discussion Meeting on Relaxations in Complex Systems, Barcelona, Spanien, 21/07/2013 - 26/07/2013, .

Are the dynamics of silicate glasses and glass-forming liquids embedded in their elastic properties? Invited Talk. / Smedskjær, Morten Mattrup; Mauro, John C.

2013. Abstract fra 7th International Discussion Meeting on Relaxations in Complex Systems, Barcelona, Spanien.

Publikation: Konferencebidrag uden forlag/tidsskriftKonferenceabstrakt til konferenceForskningpeer review

TY - ABST

T1 - Are the dynamics of silicate glasses and glass-forming liquids embedded in their elastic properties?

T2 - Invited Talk

AU - Smedskjær, Morten Mattrup

AU - Mauro, John C.

PY - 2013/7/26

Y1 - 2013/7/26

N2 - According to the elastic theory of the glass transition, the dynamics of glasses and glass-forming liquids are controlled by the evolution of shear modulus. In particular, the elastic shoving model expresses dynamics in terms of an activation energy required to shove aside the surrounding atoms, which is determined by the shear modulus. First, we here present an in situ high-temperature Brillouin spectroscopy test of the shoving model near the glass transition of eight aluminosilicate glass-forming systems. We find that the measured viscosity data agree qualitatively with the measured temperature dependence of shear moduli, as predicted by the shoving model. However, the model systematically underpredicts the values of fragility. Second, we also present a thorough test of the shoving model for predicting the low temperature dynamics of an aluminosilicate glass system. This is done by measuring the nonequilibrium viscosity over a wide range of fictive temperatures. We show that the model systematically underpredicts the changes in nonequilibrium viscosity with fictive temperature when compared with experimental data. Hence, both set of experiments suggest that the dynamics of the silicate glass transition are governed by additional factors beyond the evolution of the shear modulus.

AB - According to the elastic theory of the glass transition, the dynamics of glasses and glass-forming liquids are controlled by the evolution of shear modulus. In particular, the elastic shoving model expresses dynamics in terms of an activation energy required to shove aside the surrounding atoms, which is determined by the shear modulus. First, we here present an in situ high-temperature Brillouin spectroscopy test of the shoving model near the glass transition of eight aluminosilicate glass-forming systems. We find that the measured viscosity data agree qualitatively with the measured temperature dependence of shear moduli, as predicted by the shoving model. However, the model systematically underpredicts the values of fragility. Second, we also present a thorough test of the shoving model for predicting the low temperature dynamics of an aluminosilicate glass system. This is done by measuring the nonequilibrium viscosity over a wide range of fictive temperatures. We show that the model systematically underpredicts the changes in nonequilibrium viscosity with fictive temperature when compared with experimental data. Hence, both set of experiments suggest that the dynamics of the silicate glass transition are governed by additional factors beyond the evolution of the shear modulus.

M3 - Conference abstract for conference

ER -

Smedskjær MM, Mauro JC. Are the dynamics of silicate glasses and glass-forming liquids embedded in their elastic properties? Invited Talk. 2013. Abstract fra 7th International Discussion Meeting on Relaxations in Complex Systems, Barcelona, Spanien.