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  Temperature and pressure dependence of the alpha relaxation and configurational entropy of a prototype glass former

Comez, L., Fioretto, D., Kriegs, H., & Steffen, W. (2002). Temperature and pressure dependence of the alpha relaxation and configurational entropy of a prototype glass former. Physical Review E, 66(3): 032501.

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Comez, L.1, Autor           
Fioretto, D., Autor
Kriegs, H.1, Autor           
Steffen, W.1, Autor           
Affiliations:
1MPI for Polymer Research, Max Planck Society, ou_1309545              

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 Zusammenfassung: The alpha relaxation process of the fragile glass former salol is investigated in the T-P domain by means of photon correlation spectroscopy. We find that a time-pressure superposition principle is obeyed for the relaxation function in addition to the time-temperature superposition. The behavior of the relaxation time is studied by using an extended version of the Adam-Gibbs model including the pressure dependence. The excellent conformity of the equation describing the bidimensional surface tau(T,P) to the experimental data provides a positive check for this model, here verified on photon correlation measurements. The same model gives a rationale of the phenomenological expressions recently introduced to describe the changes in the slow dynamics induced by varying both temperature and pressure. These findings suggest that the reduction of configurational entropy actually guides the liquid toward the glass transition.

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Sprache(n): eng - English
 Datum: 2002-09
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Keine Begutachtung
 Identifikatoren: eDoc: 28290
ISI: 000178623300077
Anderer: P-02-103
 Art des Abschluß: -

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Titel: Physical Review E
  Alternativer Titel : Phys. Rev. E
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 66 (3) Artikelnummer: 032501 Start- / Endseite: - Identifikator: ISSN: 1063-651X