Change in dielectric constant along and perpendicular to induced strain in a supercooled liquid and in amorphous media

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Abstract
Brillouin spectroscopy in amorphous media for different angles offers a direct way to determine the difference between changes in dielectric constant along and perpendicular to induced strain. Here the method is applied to quartz glass and supercooled liquid o-terphenyl. It is found for liquid o-terphenyl that the change in dielectric constant along the induced displacement is smaller than the change in dielectric constant perpendicular to the induced displacement, as it is also in quartz.

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