Glass transition on long time scales

Brüning, Ralf; Samwer, K.

doi:10.1103/physrevb.46.11318

Cited by 277 publications

(178 citation statements)

References 16 publications

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“…Table 4 also shows the effect of heating rate on measured Tg. Generally, as the heating rate is increased there was an observed increase in Tg, which in agreement with the work of Bruning & Samer (1992). The Tg values obtained for the ground red lentil cotyledons were higher than the Tg values obtained by Perdon et al (2000) and Cao et al (2004) for rice at comparable moisture contents.…”

Section: Discussionsupporting

confidence: 79%

A Polymer Science Approach to Physico-Chemical Characterization and Processing of Pulse Seeds

Ross¹,

Arntfield²,

Cenkowski³

2013

Polymer Science

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Section: Discussionsupporting

confidence: 79%

A Polymer Science Approach to Physico-Chemical Characterization and Processing of Pulse Seeds

Ross¹,

Arntfield²,

Cenkowski³

2013

Polymer Science

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“…Since the value of T g is given by the timescale of the experiment, it can be changed if the sample is cooled with different cooling rates [4,5]. Therefore this dependence opens in principle the possibility to investigate the temperature dependence of the configurational part of the specific heat.…”

Section: Introductionmentioning

confidence: 99%

Frequency-dependent specific heat of viscous silica

et al. 2001

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We apply the Mori-Zwanzig projection operator formalism to obtain an expression for the frequency dependent specific heat c(z) of a liquid. By using an exact transformation formula due to Lebowitz et al., we derive a relation between c(z) and K(t), the autocorrelation function of temperature fluctuations in the microcanonical ensemble. This connection thus allows to determine c(z) from computer simulations in equilibrium, i.e. without an external perturbation. By considering the generalization of K(t) to finite wave-vectors, we derive an expression to determine the thermal conductivity λ from such simulations. We present the results of extensive computer simulations in which we use the derived relations to determine c(z) over eight decades in frequency, as well as λ. The system investigated is a simple but realistic model for amorphous silica. We find that at high frequencies the real part of c(z) has the value of an ideal gas. c ′ (ω) increases quickly at those frequencies which correspond to the vibrational excitations of the system. At low temperatures c ′ (ω) shows a second step. The frequency at which this step is observed is comparable to the one at which the α−relaxation peak is observed in the intermediate scattering function. Also the temperature dependence of the location of this second step is the same as the one of the α−peak, thus showing that these quantities are intimately connected to each other. From c ′ (ω) we estimate the temperature dependence of the vibrational and configurational part of the specific heat. We find that the static value of c(z) as well as λ are in good agreement with experimental data.

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“…It is well accepted that a glass can yield differently solidified states, which is evidenced as thermodynamic difference in its supercooled liquid and determines the kinetic nature of glass transition. 11,12) Such a difference also reflects in an essential characteristic of a glass, namely structural flexibility. In this paper, we present a plastic Pd 40 Ni 40 Si 5 P 15 BMG, showing clear microstrutural variation.…”

Section: Introductionmentioning

confidence: 99%

Structural Flexibility of a Pd40Ni40Si5P15 Bulk Metallic Glass

et al. 2010

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We report that clearly different microstructures were obtained corresponding to different parts in a Pd 40 Ni 40 Si 5 P 15 glassy rod, showing a nature of structural flexibility of a glass. Such a structural difference was believed to have the origin in the different cooling rate induced by the solidification in succession of the molten alloy during the casting. Upon this difference in the microstructure, the samples show very different deformation behaviors.

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Glass transition on long time scales

Cited by 277 publications

References 16 publications

A Polymer Science Approach to Physico-Chemical Characterization and Processing of Pulse Seeds

A Polymer Science Approach to Physico-Chemical Characterization and Processing of Pulse Seeds

Frequency-dependent specific heat of viscous silica

Structural Flexibility of a Pd<SUB>40</SUB>Ni<SUB>40</SUB>Si<SUB>5</SUB>P<SUB>15</SUB> Bulk Metallic Glass

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