Light-scattering study of β-relaxation in CaKNO3 and salol near the liquid-glass transition: idealized and extended mode coupling theory analysis

G. Li, M. Fuchs, W. M. Du, A. Latz, Nongjian Tao, J. Hernandez, W. Götze, H. Z. Cummins

Research output: Contribution to journalArticle

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Abstract

Depolarized light-scattering measurements have revealed the dynamics of CaKNO3 and salol near their liquid-glass transition temperatures in the frequency range of ∼ 0.2 GHz to ∼ 4 THz. The two-step relaxation process predicted by the mode coupling theory was observed in the supercooled liquid near Tc. Idealized mode coupling theory analysis for the β-relaxation region provided reasonable agreement with the scaling predictions. The crossover temperature was identified from both above and below Tc. However, systematic differences between the experimental data and the idealized theoretical β-spectra were observed at low frequencies for temperatures near and below Tc. An extended mode coupling theory analysis, which includes the phonon-assisted hopping transport, provided a good description of the complete experimental β-spectra. The hopping rate was quantitatively estimated from the analysis. Transition regions and trajectories were found in the temperature-hopping rate plane.

Original languageEnglish (US)
Pages (from-to)43-51
Number of pages9
JournalJournal of Non-Crystalline Solids
Volume172-174
Issue numberPART 1
DOIs
StatePublished - Sep 1 1994
Externally publishedYes

Fingerprint

Light scattering
coupled modes
Glass transition
light scattering
glass
Liquids
liquids
Relaxation processes
Temperature
glass transition temperature
temperature
crossovers
frequency ranges
Trajectories
trajectories
low frequencies
scaling
predictions
phenyl salicylate
Glass transition temperature

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

Light-scattering study of β-relaxation in CaKNO3 and salol near the liquid-glass transition : idealized and extended mode coupling theory analysis. / Li, G.; Fuchs, M.; Du, W. M.; Latz, A.; Tao, Nongjian; Hernandez, J.; Götze, W.; Cummins, H. Z.

In: Journal of Non-Crystalline Solids, Vol. 172-174, No. PART 1, 01.09.1994, p. 43-51.

Research output: Contribution to journalArticle

Li, G. ; Fuchs, M. ; Du, W. M. ; Latz, A. ; Tao, Nongjian ; Hernandez, J. ; Götze, W. ; Cummins, H. Z. / Light-scattering study of β-relaxation in CaKNO3 and salol near the liquid-glass transition : idealized and extended mode coupling theory analysis. In: Journal of Non-Crystalline Solids. 1994 ; Vol. 172-174, No. PART 1. pp. 43-51.
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abstract = "Depolarized light-scattering measurements have revealed the dynamics of CaKNO3 and salol near their liquid-glass transition temperatures in the frequency range of ∼ 0.2 GHz to ∼ 4 THz. The two-step relaxation process predicted by the mode coupling theory was observed in the supercooled liquid near Tc. Idealized mode coupling theory analysis for the β-relaxation region provided reasonable agreement with the scaling predictions. The crossover temperature was identified from both above and below Tc. However, systematic differences between the experimental data and the idealized theoretical β-spectra were observed at low frequencies for temperatures near and below Tc. An extended mode coupling theory analysis, which includes the phonon-assisted hopping transport, provided a good description of the complete experimental β-spectra. The hopping rate was quantitatively estimated from the analysis. Transition regions and trajectories were found in the temperature-hopping rate plane.",
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AU - Fuchs, M.

AU - Du, W. M.

AU - Latz, A.

AU - Tao, Nongjian

AU - Hernandez, J.

AU - Götze, W.

AU - Cummins, H. Z.

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AB - Depolarized light-scattering measurements have revealed the dynamics of CaKNO3 and salol near their liquid-glass transition temperatures in the frequency range of ∼ 0.2 GHz to ∼ 4 THz. The two-step relaxation process predicted by the mode coupling theory was observed in the supercooled liquid near Tc. Idealized mode coupling theory analysis for the β-relaxation region provided reasonable agreement with the scaling predictions. The crossover temperature was identified from both above and below Tc. However, systematic differences between the experimental data and the idealized theoretical β-spectra were observed at low frequencies for temperatures near and below Tc. An extended mode coupling theory analysis, which includes the phonon-assisted hopping transport, provided a good description of the complete experimental β-spectra. The hopping rate was quantitatively estimated from the analysis. Transition regions and trajectories were found in the temperature-hopping rate plane.

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