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Time-temperature superposition in viscous liquids.

N B Olsen1, T Christensen, J C Dyre

  • 1Department of Mathematics and Physics (IMFUFA), Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark.

Physical Review Letters
|February 15, 2001
PubMed
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Dielectric relaxation measurements reveal that time-temperature superposition (TTS) applies to supercooled triphenyl phosphite

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • Supercooled liquids exhibit complex dynamics near the glass transition.
  • Understanding relaxation processes is key to characterizing glass-forming materials.

Purpose of the Study:

  • To investigate the validity of time-temperature superposition (TTS) for primary relaxation in supercooled triphenyl phosphite.
  • To explore the relationship between TTS, high-frequency loss decay, and loss peak width in molecular liquids.

Main Methods:

  • Dielectric relaxation spectroscopy was employed.
  • Measurements were conducted on supercooled triphenyl phosphite and other molecular liquids near their glass transition temperatures.

Main Results:

Related Experiment Videos

  • Time-temperature superposition (TTS) was observed for the primary relaxation of triphenyl phosphite at low temperatures.
  • A correlation was found between TTS and a specific high-frequency decay (omega(-1/2)) of dielectric loss.
  • The width of the dielectric loss peak was found to be nonuniversal across different molecular liquids.

Conclusions:

  • The findings support the applicability of TTS in certain supercooled molecular liquids.
  • The study links TTS to a characteristic high-frequency dielectric loss decay, offering insights into relaxation mechanisms.
  • The nonuniversal nature of the loss peak width highlights the diversity of dynamics in glass-forming systems.