Dynamics of glass-forming liquids. III. Comparing the dielectric α- and β-relaxation of 1-propanol and ο-terphenyl

C. Hansen, F. Stickel, T. Berger, Ranko Richert, E. W. Fischer

Research output: Contribution to journalArticle

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Abstract

We have measured the dielectric relaxation of the glass-former 1-propanol for temperatures between 65 and 350 K in the frequency range 10-2 to 2·1010 Hz and the photon correlation spectroscopy decays near Tg. Attributing the strong Debye-type process of 1-propanol to distinct -OH group effects leaves two faster processes related to the structural relaxation which can be identified as α-relaxation and Johari-Goldstein type β-relaxation characteristic of nonhydrogen-bonding supercooled liquids. From the temperature dependent relaxation times τ(T) regarding the three distinct loss peaks, we can specify an α-β-bifurcation temperature Tβ, which coincides with characteristic qualitative changes in the τ(T) behavior, as also observed for ortho-terphenyl and other glass-forming liquids. This assignment is confirmed by the correlation times derived from incoherent quasielastic light-scattering data obtained from the simultaneously measured photon-correlation spectroscopy.

Original languageEnglish (US)
Pages (from-to)1086-1093
Number of pages8
JournalJournal of Chemical Physics
Volume107
Issue number4
StatePublished - Jul 22 1997
Externally publishedYes

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1-Propanol
terphenyls
Photon correlation spectroscopy
Glass
glass
Liquids
liquids
Incoherent scattering
Structural relaxation
Dielectric relaxation
Light scattering
Relaxation time
Temperature
incoherent scattering
photons
leaves
spectroscopy
temperature
light scattering
relaxation time

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Dynamics of glass-forming liquids. III. Comparing the dielectric α- and β-relaxation of 1-propanol and ο-terphenyl. / Hansen, C.; Stickel, F.; Berger, T.; Richert, Ranko; Fischer, E. W.

In: Journal of Chemical Physics, Vol. 107, No. 4, 22.07.1997, p. 1086-1093.

Research output: Contribution to journalArticle

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