期刊
JOURNAL OF CHEMICAL PHYSICS
卷 130, 期 15, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3098911
关键词
dielectric function; dielectric losses; dielectric relaxation; electric strength; glass transition; organic compounds; solid-liquid transformations; vitrification
资金
- Danish National Research Foundation (DNRF)
This paper presents dielectric relaxation data for organic glass-forming liquids compiled from different groups and supplemented by new measurements. The main quantity of interest is the minimum slope of the alpha dielectric loss plotted as a function of frequency in a log-log plot, i.e., the numerically largest slope above the loss peak frequency. The data consisting of 347 spectra for 53 liquids show prevalence of minimum slopes close to -1/2, corresponding to approximate root t dependence of the dielectric relaxation function at short times. The paper studies possible correlations between minimum slopes and (1) temperature (quantified via the loss peak frequency); (2) how well an inverse power-law fits data above the loss peak; (3) degree of time-temperature superposition; (4) loss peak half width; (5) deviation from non-Arrhenius behavior; (6) loss strength. For the first three points we find correlations that show a special status of liquids with minimum slopes close to -1/2. For the last three points only fairly insignificant correlations are found, with the exception of large-loss liquids that have minimum slopes that are numerically significantly larger than 1/2. We conclude that-excluding large-loss liquids-approximate root t relaxation appears to be a generic property of the alpha relaxation of organic glass formers.
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