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, R. Richert, E. W. Fischer

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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
Issue number4
StatePublished - Jul 22 1997
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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