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Neutron Scattering at the Glass Transition

  • Chapter
Phase Transitions and Relaxation in Systems with Competing Energy Scales

Part of the book series: NATO ASI Series ((ASIC,volume 415))

Abstract

In the close neighbourhood of the glass transition temperature, neutron scattering shows fast relaxations with a practically temperature-independent time constant of the order of a picosecond. Recent neutron data indicate a close connection between these fast relaxations and the soft vibrations which coexist and interact with the sound waves in the glassy state, giving rise to the maximum in C p /T 3 (C p specific heat, T temperature) and to the boson peak in neutron and Raman scattering.

The slow α-relaxation of the flow process can only be studied by neutrons at higher temperatures, where the relaxation times enter the nanosecond range. Spin-echo measurements have shown a stretched exponential Kohlrausch time dependence and the validity of the time-temperature Vogel-Fulcher-Tamman scaling even at these very short relaxation times. Furthermore, the separation of the Johari-Goldstein relaxation from the α-process could be observed. Several predictions of the mode coupling theory have been verified in four different substances.

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Authors and Affiliations

  1. Institut für Festkörperforschung, Forschungszentrum Jülich, Postfach 1913, D-5170, Jülich, Federal Republic of Germany

    U. Buchenau

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  1. U. Buchenau
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Editors and Affiliations

  1. Institutt for energiteknikk, POB 40, N-2007, Kjeller, Norway

    Tormod Riste (Director) (Director)

  2. Department of Physics, University of Oxford, UK

    David Sherrington (Co-director) (Co-director)

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Buchenau, U. (1993). Neutron Scattering at the Glass Transition. In: Riste, T., Sherrington, D. (eds) Phase Transitions and Relaxation in Systems with Competing Energy Scales. NATO ASI Series, vol 415. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1908-5_11

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  • DOI: https://doi.org/10.1007/978-94-011-1908-5_11

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-4843-9

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