Giant
thermally stimulated depolarization currents (TSDCs) in poled
silicate glasses have been observed above the glass transition temperatures, T
g, with such giant currents exceeding by 5–6
orders of magnitude ones observed up to now below T
g. In accordance with the given interpretation, these
depolarization currents are conditioned by the relaxation (discharge)
of the “frozen” volume charge, formed in glasses by
poling, via the ion drift under the electric field as well as “frozen”
in the poled glass. It is shown that the main portion of the “frozen”
volume charge in poled glasses relaxes just via the ion drift mechanism.
The closeness of the activation energy of this process and the activation
energy of the viscous flow of the glass is revealed.
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