Mapping Isobaric Aging onto the Equilibrium Phase Diagram

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

The linear volume relaxation and the nonlinear volume aging of a glass-forming liquid are measured, directly compared, and used to extract the out-of-equilibrium relaxation time. This opens a window to investigate how the relaxation time depends on temperature, structure, and volume in parts of phase space that are not accessed by the equilibrium liquid. It is found that the temperature dependence of relaxation time is non-Arrhenius even in the isostructural case—challenging the Adam-Gibbs entropy model. Based on the presented data and the idea that aging happens through quasiequilibrium states, we suggest a mapping of the out-of-equilibrium states during isobaric aging to the equilibrium phase diagram. This mapping implies the existence of isostructural lines in the equilibrium phase diagram. The relaxation time is found to depend on the bath temperature, density, and a just single structural parameter, referred to as an effective temperature.
OriginalsprogEngelsk
Artikelnummer115703
TidsskriftPhysical Review Letters
Vol/bind119
Udgave nummer11
ISSN0031-9007
DOI
StatusUdgivet - 15 sep. 2017

Bibliografisk note

The supplementary material is a short text file with some extra technical information and background data which is useful for the expert reader of the paper.

Citer dette

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title = "Mapping Isobaric Aging onto the Equilibrium Phase Diagram",
abstract = "The linear volume relaxation and the nonlinear volume aging of a glass-forming liquid are measured, directly compared, and used to extract the out-of-equilibrium relaxation time. This opens a window to investigate how the relaxation time depends on temperature, structure, and volume in parts of phase space that are not accessed by the equilibrium liquid. It is found that the temperature dependence of relaxation time is non-Arrhenius even in the isostructural case—challenging the Adam-Gibbs entropy model. Based on the presented data and the idea that aging happens through quasiequilibrium states, we suggest a mapping of the out-of-equilibrium states during isobaric aging to the equilibrium phase diagram. This mapping implies the existence of isostructural lines in the equilibrium phase diagram. The relaxation time is found to depend on the bath temperature, density, and a just single structural parameter, referred to as an effective temperature.",
keywords = "Viscoelasticity, Glass transition, Temperature, Phase diagrams, Thermal expansion, Condensed Matter & Materials Physics, Polymers & Soft Matter",
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Mapping Isobaric Aging onto the Equilibrium Phase Diagram. / Niss, Kristine.

I: Physical Review Letters, Bind 119, Nr. 11, 115703, 15.09.2017.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Mapping Isobaric Aging onto the Equilibrium Phase Diagram

AU - Niss, Kristine

N1 - The supplementary material is a short text file with some extra technical information and background data which is useful for the expert reader of the paper.

PY - 2017/9/15

Y1 - 2017/9/15

N2 - The linear volume relaxation and the nonlinear volume aging of a glass-forming liquid are measured, directly compared, and used to extract the out-of-equilibrium relaxation time. This opens a window to investigate how the relaxation time depends on temperature, structure, and volume in parts of phase space that are not accessed by the equilibrium liquid. It is found that the temperature dependence of relaxation time is non-Arrhenius even in the isostructural case—challenging the Adam-Gibbs entropy model. Based on the presented data and the idea that aging happens through quasiequilibrium states, we suggest a mapping of the out-of-equilibrium states during isobaric aging to the equilibrium phase diagram. This mapping implies the existence of isostructural lines in the equilibrium phase diagram. The relaxation time is found to depend on the bath temperature, density, and a just single structural parameter, referred to as an effective temperature.

AB - The linear volume relaxation and the nonlinear volume aging of a glass-forming liquid are measured, directly compared, and used to extract the out-of-equilibrium relaxation time. This opens a window to investigate how the relaxation time depends on temperature, structure, and volume in parts of phase space that are not accessed by the equilibrium liquid. It is found that the temperature dependence of relaxation time is non-Arrhenius even in the isostructural case—challenging the Adam-Gibbs entropy model. Based on the presented data and the idea that aging happens through quasiequilibrium states, we suggest a mapping of the out-of-equilibrium states during isobaric aging to the equilibrium phase diagram. This mapping implies the existence of isostructural lines in the equilibrium phase diagram. The relaxation time is found to depend on the bath temperature, density, and a just single structural parameter, referred to as an effective temperature.

KW - Viscoelasticity

KW - Glass transition

KW - Temperature

KW - Phase diagrams

KW - Thermal expansion

KW - Condensed Matter & Materials Physics

KW - Polymers & Soft Matter

U2 - 10.1103/PhysRevLett.119.115703

DO - 10.1103/PhysRevLett.119.115703

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VL - 119

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

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