High-frequency dynamics of type-B glass formers investigated by broadband dielectric spectroscopy
arXiv:1004.5145 · doi:10.1016/j.jnoncrysol.2010.06.074
Abstract
We present the results of broadband dielectric spectroscopy on two glass formers with strong Johari-Goldstein beta-relaxations. In addition to the alpha- and beta-relaxation dynamics, the extension of the spectra up to 1 THz also allows revealing information on the fast beta-process in this class of materials. There is clear evidence for a fast process contributing in the region of the high-frequency loss minimum, which is analyzed in terms of the idealized mode-coupling theory.
7 pages, 5 figures
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