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Slow processes in supercooled o-terphenyl: relaxation and decoupling.

Makina Saito1, Shinji Kitao, Yasuhiro Kobayashi

  • 1Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0494, Japan.

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|September 26, 2012
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Summary

Researchers mapped relaxation times in o-terphenyl, finding the slow beta process decouples from the alpha process at 278 K. This indicates a need for solid-like conditions for decoupling, challenging previous assumptions about relaxation time crossing.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Polymer Physics

Background:

  • Understanding molecular dynamics in amorphous materials is crucial for predicting their properties.
  • The interplay between alpha (α) and beta (β) relaxation processes influences material behavior.
  • Previous studies suggested a decoupling temperature around 290 K for o-terphenyl.

Purpose of the Study:

  • To investigate the decoupling of slow beta (β) process from alpha (α) relaxation in o-terphenyl.
  • To precisely map relaxation times across different dynamic processes.
  • To determine the conditions under which these relaxation processes diverge.

Main Methods:

  • Utilized quasielastic neutron scattering (QENS) with synchrotron radiation.
  • Employed nuclear resonant scattering (NRS) for high-resolution measurements.
  • Analyzed relaxation times (τ) as a function of momentum transfer (q).

Main Results:

  • The slow β process was found to decouple from the α process at 278 K, below the previously identified 290 K.
  • Decoupling requires achieving solid-like conditions through further cooling below 290 K.
  • Evidence of restricted dynamics in the slow β process was observed via anomalous q-dependence (<τ> ∝ q⁻²·⁹) at 265 K.

Conclusions:

  • The α and slow β relaxation times do not cross as previously extrapolated, due to differing length scales.
  • The decoupling temperature is lower than previously assumed, highlighting the importance of solid-like states.
  • Restricted dynamics of the slow β process are confirmed by its unique momentum transfer dependence.