Source of non-arrhenius average relaxation time in glass-forming liquids

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    Resumé

    A major mystery of glass-forming liquids is the non-Arrhenius temperature-dependence of the average relaxation time. This paper briefly reviews the classical phenomenological models for non-Arrhenius behavior – the free volume model and the entropy model – and critiques against these models. We then discuss a recently proposed model according to which the activation energy of the average relaxation time is determined by the work done in shoving aside the surrounding liquid to create space needed for a "flow event". In this model, which is based on the fact that intermolecular interactions are anharmonic, the non-Arrhenius temperature-dependence of the average relaxation time is a consequence of the fact that the instantaneous shear modulus increases upon cooling.
    OriginalsprogEngelsk
    TidsskriftJournal of Non-Crystalline Solids
    Vol/bind235
    Sider (fra-til)142-149
    ISSN0022-3093
    StatusUdgivet - 1998

    Citer dette

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    title = "Source of non-arrhenius average relaxation time in glass-forming liquids",
    abstract = "A major mystery of glass-forming liquids is the non-Arrhenius temperature-dependence of the average relaxation time. This paper briefly reviews the classical phenomenological models for non-Arrhenius behavior – the free volume model and the entropy model – and critiques against these models. We then discuss a recently proposed model according to which the activation energy of the average relaxation time is determined by the work done in shoving aside the surrounding liquid to create space needed for a {"}flow event{"}. In this model, which is based on the fact that intermolecular interactions are anharmonic, the non-Arrhenius temperature-dependence of the average relaxation time is a consequence of the fact that the instantaneous shear modulus increases upon cooling.",
    author = "Jeppe Dyre",
    year = "1998",
    language = "English",
    volume = "235",
    pages = "142--149",
    journal = "Journal of Non-Crystalline Solids",
    issn = "0022-3093",
    publisher = "Elsevier BV * North-Holland",

    }

    Source of non-arrhenius average relaxation time in glass-forming liquids. / Dyre, Jeppe.

    I: Journal of Non-Crystalline Solids, Bind 235, 1998, s. 142-149.

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

    TY - JOUR

    T1 - Source of non-arrhenius average relaxation time in glass-forming liquids

    AU - Dyre, Jeppe

    PY - 1998

    Y1 - 1998

    N2 - A major mystery of glass-forming liquids is the non-Arrhenius temperature-dependence of the average relaxation time. This paper briefly reviews the classical phenomenological models for non-Arrhenius behavior – the free volume model and the entropy model – and critiques against these models. We then discuss a recently proposed model according to which the activation energy of the average relaxation time is determined by the work done in shoving aside the surrounding liquid to create space needed for a "flow event". In this model, which is based on the fact that intermolecular interactions are anharmonic, the non-Arrhenius temperature-dependence of the average relaxation time is a consequence of the fact that the instantaneous shear modulus increases upon cooling.

    AB - A major mystery of glass-forming liquids is the non-Arrhenius temperature-dependence of the average relaxation time. This paper briefly reviews the classical phenomenological models for non-Arrhenius behavior – the free volume model and the entropy model – and critiques against these models. We then discuss a recently proposed model according to which the activation energy of the average relaxation time is determined by the work done in shoving aside the surrounding liquid to create space needed for a "flow event". In this model, which is based on the fact that intermolecular interactions are anharmonic, the non-Arrhenius temperature-dependence of the average relaxation time is a consequence of the fact that the instantaneous shear modulus increases upon cooling.

    M3 - Journal article

    VL - 235

    SP - 142

    EP - 149

    JO - Journal of Non-Crystalline Solids

    JF - Journal of Non-Crystalline Solids

    SN - 0022-3093

    ER -