On the pressure dependence of fragility

Reiser, Andreas; Kasper, G.

doi:10.1209/epl/i2006-10401-5

Cited by 21 publications

(42 citation statements)

References 36 publications

(42 reference statements)

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“…This question has received much attention in the last years, in particular within the experimental community. 40,41,42,43,44 A tentative answer can be given for BMLJ, for which we performed isobaric quenches in the range 5 ≤ P ≤ 50. By looking at the inset of Fig.…”

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confidence: 95%

Understanding fragility in supercooled Lennard-Jones mixtures. I. Locally preferred structures

Coslovich

Pastore²

2007

The Journal of Chemical Physics

177

277

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We reveal the existence of systematic variations of isobaric fragility in different supercooled Lennard-Jones binary mixtures by performing molecular dynamics simulations. The connection between fragility and local structures in the bulk is analyzed by means of a Voronoi construction. We find that clusters of particles belonging to locally preferred structures form slow, long-lived domains, whose spatial extension increases by decreasing temperature. As a general rule, a more rapid growth, upon supercooling, of such domains is associated to a more pronounced super-Arrhenius behavior, hence to a larger fragility.

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mentioning

confidence: 95%

Understanding fragility in supercooled Lennard-Jones mixtures. I. Locally preferred structures

Coslovich

Pastore²

2007

The Journal of Chemical Physics

177

277

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“…Although the widely cited value at ambient pressure m p = 104 (based on dielectric spectroscopy data from Ref. 67) places PC as a very fragile glassformer, later measurements yield slightly smaller values: m p = 99 from calorimetric measurements 2 and m p = 94±3 from dielectric ones 1,13 . The value obtained in this work at ambient pressure practically coincides with the last one (m p = 92 ± 5) but it seems to us that the limited pressure range does not allow the authors of Ref.…”

Section: Discussion and Conclusive Remarksmentioning

confidence: 95%

“…Upon supercooling and subsequent vitrification, the characteristic frequency of the structural relaxation becomes considerably lower and shifts toward the radio-frequency and even sub-Hertz range. There is a number of works where the pressure dependence of structural relaxation in PC was studied by dielectric spectroscopy methods [10][11][12][13][14] but the data on ultrasound velocity measurements are still absent, although this method not only provides the data on the relaxation characteristics but also sheds the light upon the thermodynamic data, such as the equation of state for the liquid. In the pressure range up to 1.6 GPa, the authors of the Refs.…”

Section: Introductionmentioning

confidence: 99%

“…As far as we know, there were only a few attempts to study the glass transition by ultrasonic techniques under pressure (e.g., in glycerol 43 ) in contrast to the high-pressure applications of dielectric spectroscopy (see [10][11][12][13][14]19 and references therein) and viscosity measurements (e.g., Refs. 15 and 32 and references therein).…”

Section: Introductionmentioning

confidence: 99%

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Dielectric spectroscopy and ultrasonic study of propylene carbonate under ultra-high pressures

Kondrin

Gromnitskaya²,

Pronin³

et al. 2012

The Journal of Chemical Physics

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We present the high pressure dielectric spectroscopy (up to 4.2 GPa) and ultrasonic study (up to 1.7 GPa) of liquid and glassy propylene carbonate (PC). Both of the methods provide complementary pictures of the glass transition in PC under pressure. No other relaxation processes except α-relaxation have been found in the studied pressure interval. The propylene carbonate liquid is a glassformer where simple relaxation and the absence of β-relaxation are registered in the record-breaking ranges of pressures and densities. The equation of state of liquid PC was extended up to 1 GPa from ultrasonic measurements of bulk modulus and is in good accordance with the previous equations developed from volumetric data. We measured the bulk and shear moduli and Poisson's ratio of glassy PC up to 1.7 GPa. Many relaxation and elastic properties of PC can be qualitatively described by the soft-sphere or Lennard-Jones model. However, for the quantitative description of entire set of the experimental data, these models are insufficient. Moreover, the Poisson coefficient value for glassy PC indicates a significant contribution of non-central forces to the intermolecular potential. The well-known correlation between Poisson's ratio and fragility index (obtained from dielectric relaxation) is confirmed for PC at ambient pressure, but it is violated with pressure increase. This indicates that different features of the potential energy landscape are responsible for the evolution of dielectric response and elasticity with pressure increase.

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“…These estimations were based on data from [23,41] for DEP and [29] for PC. The analysis presented also employs T g (P) dependences, recalling data from [23] for DEP and [39] for PC. The latter data have to be supplemented with the authors' measurements to enable a reliable derivative-based analysis to be made.…”

Section: The Comparison Of Vft-and Avm-based Descriptionsmentioning

confidence: 99%

On the pressure evolution of dynamic properties of supercooled liquids

Drozd-Rzoska

Rzoska

Roland

et al. 2008

J. Phys.: Condens. Matter

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A pressure counterpart of the Vogel-Fulcher-Tammann (VFT) equation for representing the evolution of dielectric relaxation times or related dynamic properties is discussed:, where P = P − P SL , P 0 is the ideal glass pressure estimation, D P is the pressure fragility strength coefficient, and the prefactor τ P 0 is related to the relaxation time at the stability limit (P SL ) in the negative pressure domain. The discussion is extended to the Avramov model (AvM) relation τ (T,

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On the pressure dependence of fragility

Cited by 21 publications

References 36 publications

Understanding fragility in supercooled Lennard-Jones mixtures. I. Locally preferred structures

Understanding fragility in supercooled Lennard-Jones mixtures. I. Locally preferred structures

Dielectric spectroscopy and ultrasonic study of propylene carbonate under ultra-high pressures

On the pressure evolution of dynamic properties of supercooled liquids

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