ABSTRACT
When an electric field is removed from a polar material,
the process of polarization is reversed. However, this
reversion, as in initial polarization, is not instantaneous
and is characterized by a time interval, t-the relaxation time. For a low-frequency variation of the field the dipoles
may align and realign exactly in phase with the applied
field.[2] However, at high frequencies, as the period of
oscillation decreases and approaches t, the dipoles are unable to follow the rapid field reversals. This results in
energy losses and hence e0 decreases as frequency increases. This frequency-dependent behavior is referred
to as dispersion.[2] However, e00 has a different response to changes in frequency as it passes through a peak value that
corresponds to the relaxation frequency.
