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Relation between configurational entropy and relaxation dynamics of glass-forming systems under volume and temperature reduction

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Title: Relation between configurational entropy and relaxation dynamics of glass-forming systems under volume and temperature reduction
Authors: Capaccioli, Simone1,2 capacci@df.unipi.it, Prevosto, Daniele2, Lucchesi, Mauro1,2, Amirkhani, Masoud1, Rolla, Pierangelo1,2
Source: Journal of Non-Crystalline Solids. May2009, Vol. 355 Issue 10-12, p753-758. 6p.
Subjects: Entropy, Dielectric relaxation, Chemical reduction, Molecular dynamics, Supercooled liquids, Crystals, Glass transition temperature
Abstract: Abstract: The structural relaxation dynamics of two molecular glass-forming systems have been analyzed by means of dielectric spectroscopy, under cooling and compression conditions. The relation of the dynamic slowing down with the reduction of the configurational entropy, SC , as predicted by Adam and Gibbs (AG), was also investigated. As SC is not directly accessible by experiments, it was estimated, following a common procedure in literature, from the excess entropy Sexc of the supercooled liquid with respect to the crystal, determined from calorimetric and expansivity measurements over the same T–P range of dynamics investigation. The AG relation, predicting linear dependence between the logarithmic of structural relaxation time and the reciprocal of the product of temperature with configurational entropy, was successfully tested. Actually, a bilinear relation between Sexc and SC was found, with different proportionality factors in isothermal and isobaric conditions. Using such results, we derived an equation for predicting the pressure dependence of the glass transition temperature, in good accordance with the experimental values in literature. [Copyright &y& Elsevier]
Copyright of Journal of Non-Crystalline Solids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 38324789
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  Data: Relation between configurational entropy and relaxation dynamics of glass-forming systems under volume and temperature reduction
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  Data: <searchLink fieldCode="AR" term="%22Capaccioli%2C+Simone%22">Capaccioli, Simone</searchLink><relatesTo>1,2</relatesTo><i> capacci@df.unipi.it</i><br /><searchLink fieldCode="AR" term="%22Prevosto%2C+Daniele%22">Prevosto, Daniele</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lucchesi%2C+Mauro%22">Lucchesi, Mauro</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Amirkhani%2C+Masoud%22">Amirkhani, Masoud</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rolla%2C+Pierangelo%22">Rolla, Pierangelo</searchLink><relatesTo>1,2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Non-Crystalline+Solids%22">Journal of Non-Crystalline Solids</searchLink>. May2009, Vol. 355 Issue 10-12, p753-758. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Entropy%22">Entropy</searchLink><br /><searchLink fieldCode="DE" term="%22Dielectric+relaxation%22">Dielectric relaxation</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+reduction%22">Chemical reduction</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+dynamics%22">Molecular dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Supercooled+liquids%22">Supercooled liquids</searchLink><br /><searchLink fieldCode="DE" term="%22Crystals%22">Crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Glass+transition+temperature%22">Glass transition temperature</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Abstract: The structural relaxation dynamics of two molecular glass-forming systems have been analyzed by means of dielectric spectroscopy, under cooling and compression conditions. The relation of the dynamic slowing down with the reduction of the configurational entropy, SC , as predicted by Adam and Gibbs (AG), was also investigated. As SC is not directly accessible by experiments, it was estimated, following a common procedure in literature, from the excess entropy Sexc of the supercooled liquid with respect to the crystal, determined from calorimetric and expansivity measurements over the same T–P range of dynamics investigation. The AG relation, predicting linear dependence between the logarithmic of structural relaxation time and the reciprocal of the product of temperature with configurational entropy, was successfully tested. Actually, a bilinear relation between Sexc and SC was found, with different proportionality factors in isothermal and isobaric conditions. Using such results, we derived an equation for predicting the pressure dependence of the glass transition temperature, in good accordance with the experimental values in literature. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Non-Crystalline Solids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jnoncrysol.2009.01.034
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 6
        StartPage: 753
    Subjects:
      – SubjectFull: Entropy
        Type: general
      – SubjectFull: Dielectric relaxation
        Type: general
      – SubjectFull: Chemical reduction
        Type: general
      – SubjectFull: Molecular dynamics
        Type: general
      – SubjectFull: Supercooled liquids
        Type: general
      – SubjectFull: Crystals
        Type: general
      – SubjectFull: Glass transition temperature
        Type: general
    Titles:
      – TitleFull: Relation between configurational entropy and relaxation dynamics of glass-forming systems under volume and temperature reduction
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            NameFull: Capaccioli, Simone
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            NameFull: Prevosto, Daniele
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            NameFull: Lucchesi, Mauro
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            NameFull: Amirkhani, Masoud
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            NameFull: Rolla, Pierangelo
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            – D: 01
              M: 05
              Text: May2009
              Type: published
              Y: 2009
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              Value: 355
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              Value: 10-12
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            – TitleFull: Journal of Non-Crystalline Solids
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