Bulk and shear relaxation in glasses and highly viscous liquids.
The ratio δB/δG between the couplings of a relaxational process to compression and shear, respectively, is calculated in the Eshelby picture of structural rearrangements within a surrounding elastic matrix, assuming a constant density of stable structures in distortion space. The result is compared to experimental data for the low-temperature tunneling states in glasses and to Prigogine-Defay data at the glass transition, both from the literature.
Institut für Festkörperforschung, Forschungszentrum Jülich Postfach 1913, D-52425 Jülich, Germany. buchenau-juelich@t-online.de
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