Enthalpy relaxation in hyperquenched glasses of different fragility

Hornbøll, Lasse; Yue, Yuanzheng

doi:10.1016/j.jnoncrysol.2007.10.023

Cited by 22 publications

(30 citation statements)

References 27 publications

(41 reference statements)

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“…and CaP2O6 were determined in our previous studies (Yue, 2002;Hornbøll and Yue, 2008b). The η-T relation of the basalt system was measured in the present work.…”

Section: ) the Viscosity (η)-Temperature (T) Relations For Both mentioning

confidence: 77%

“…According to previous reports (Hornbøll and Yue, 2008b;Mauro and Loucks, 2008), the liquid fragility has an impact on the enthalpy relaxation in glass. Numerous experimental and modeling studies have been done on the enthalpy relaxation of HQ fragile oxide systems (Huang and Gupta, 1992;Yue, 2002Yue, , 2004Yue et al, 2002a,b;Angell et al, 2003;Guo et al, 2012;Zhang et al, 2013a,b,c), but to our best knowledge, almost no investigations have been conducted on the HQ prototypical strong glass former -HQ vitreous silica.…”

mentioning

confidence: 85%

“…Both HQ GeO2 glass (HQGeO2) and HQ CaP2O6 glass (i.e., HQ calcium metaphosphate -HQCmP) were produced as continuous fibers using the crucible technique (Yue, 2002;Hornbøll and Yue, 2008b). The HQ basalt (HQBas) was produced as wool fibers by using the centrifugal force cascade process (Yue et al, 2002a) and provided by Rockwool International A/S.…”

Section: Experimental Samplesmentioning

confidence: 99%

“…Concerning the relaxation behavior of the strong system -vitreous silica, some experimental results have been reported, which deal with, e.g., surface relaxation (Agarwal and Tomozawa, 1997;Koike and Tomozawa, 2006), structural anisotropy relaxation, and volume relaxation (Murach and Brückner, 1997), but no results deal with the enthalpy relaxation of the HQ vitreous silica. In this work, we focus on the enthalpy response of the HQ vitreous silica (HQSiO2) to sub-Tg annealing, and compare it with that of the HQ fragile oxide systems such as HQ basaltic glass (HQBas) (Yue and Angell, 2004) and calcium metaphosphate glass (HQCmP) (Yue, 2002), and also with that of the HQ strong vitreous GeO2 (HQGeO2) (Hornbøll and Yue, 2008b).…”

mentioning

confidence: 99%

“…We explore the anomalous enthalpy relaxation behavior of HQSiO2 and discuss its origin in terms of the potential energy landscape. To identify the universal feature of the enthalpy relaxation of strong glass formers, we compare the relaxation of HQSiO2 with that of HQGeO2 (Hornbøll and Yue, 2008b;Hu and Yue, 2008). Besides its fundamental importance, the investigation of the enthalpy relaxation in HQ strong glass formers is also of technological significance, since the annealing process has strong impact on the physical performances of those glasses.…”

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confidence: 99%

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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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“…and CaP2O6 were determined in our previous studies (Yue, 2002;Hornbøll and Yue, 2008b). The η-T relation of the basalt system was measured in the present work.…”

Section: ) the Viscosity (η)-Temperature (T) Relations For Both mentioning

confidence: 77%

mentioning

confidence: 85%

Section: Experimental Samplesmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Anomalous Enthalpy Relaxation in Vitreous Silica

Yue

2015

Front. Mater.

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Evolution of coupling modes between α and β relaxations in metallic glass-forming liquids revealed by nano-calorimetry

Ding,

Shi,

Wang

et al. 2024

Acta Materialia

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Predicting glass-to-glass and liquid-to-liquid phase transitions in supercooled water using classical nucleation theory

Tournier

2018

Chemical Physics

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Glass-to-glass and liquid-to-liquid phase transitions are observed in bulk and confined water, with or without applied pressure. They result from the competition of two liquid phases separated by an enthalpy difference depending on temperature. The classical nucleation equation of these phases is completed by this quantity existing at all temperatures, a pressure contribution, and an enthalpy excess. This equation leads to two homogeneous nucleation temperatures in each liquid phase; the first one (T nbelow T m ) being the formation temperature of an "ordered" liquid phase and the second one corresponding to the overheating temperature (T n+ above T m ). Thermodynamic properties, double glass transition temperatures, sharp enthalpy and volume changes are predicted in agreement with experimental results. The first-order transition line at T LL =0.833×T m between fragile and strong liquids joins two critical points. Glass phase above T g becomes "ordered" liquid phase disappearing at T LL at low pressure and at T n+ =1.302×T m at high pressure. 1-Introduction:Multiple liquid-to-liquid phase transitions (LLPTs) that are observed in several metallic glassforming melts, have already been predicted using a classical nucleation equation completed by an enthalpy difference of two liquid phases depending on the square of the reduced temperature =(T-T m )/T m , where T m is the melting temperature [1]. The objectives of this paper are to extend the application of this renewed equation to the thermodynamic properties of water, to explain the occurrence of glass-to-glass phase transitions in amorphous water, and to show that the low-density phases obtained under decompression are glass phases analogous to those produced by vapour deposition at temperatures close to T g [2-5].First-order transformations under pressure, induce high density amorphous phase [6][7][8][9][10][11][12][13][14], because the pressure increases the enthalpy and facilitates the glass transformation towards an equilibrium phase of higher density. These enthalpy and entropy changes cannot exceed in principle the value of the frozen enthalpy and entropy [15]. Any glass freezes enthalpy and entropy below T g , which are available for exothermic relaxation or first-order transitions.The water glass state is obtained by vapor deposition, liquid hyperquenching, confined water cooling, and application of high pressure to ice followed by various relaxation annealing [16]. A warming

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Enthalpy relaxation in hyperquenched glasses of different fragility

Cited by 22 publications

References 27 publications

Anomalous Enthalpy Relaxation in Vitreous Silica

Anomalous Enthalpy Relaxation in Vitreous Silica

Evolution of coupling modes between α and β relaxations in metallic glass-forming liquids revealed by nano-calorimetry

Predicting glass-to-glass and liquid-to-liquid phase transitions in supercooled water using classical nucleation theory

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