Structural relaxation in a viscous liquid studied by quasielastic nuclear forward scattering

I. Sergueev, H. Franz, T. Asthalter, W. Petry, U. Van Bürck, G. V. Smirnov

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Abstract

Quasielastic nuclear forward scattering (QNFS) of synchrotron radiation is employed as a probe of slow glass dynamics, in particular for the determination of the stretching parameter β in the Kohlrausch-Williams-Watts relaxation function. The influence of this type of relaxation on multiple scattering is investigated in detail, and experimental results on the dynamics of the molecular glass former ferrocene/dibutylphthalate in the undercooled viscous state are presented. We observe a temperature independent stretching parameter of 0.47(2). Fitting the high temperature breakdown of the Lamb-Mossbauer factor with a square root dependence we obtain a mode-coupling critical temperature of Tc = 202 K.

Original languageEnglish
Article number184210
Pages (from-to)1842101-1842108
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number18
StatePublished - 1 Nov 2002

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