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Neutron Scattering at the Glass Transition

Chapter
Part of the NATO ASI Series book 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.

Keywords

Glass Transition Soft Mode Fast Relaxation Mode Coupling Theory Boson Peak 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1993

Authors and Affiliations

  1. 1.Institut für FestkörperforschungForschungszentrum JülichJülichFederal Republic of Germany

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