The
idea recently spread in the literature that the β-relaxation originates from cooperative motions in the glassy
state is analysed. The results obtained by two different dielectric techniques, dielectric relaxation
spectroscopy (DRS) and thermally stimulated depolarisation currents (TSDC), are compared and, from this comparison,
it is concluded that: 1, The β-relaxation is distributed in energy, but not in entropy (i.e. in the pre-exponential
factor). 2, It thus corresponds to local, non-cooperative molecular motional processes. 3, The results obtained
by both dielectric techniques can be rendered compatible if we assume that the nature of the energy distribution
associated
with the β-process
is such that the most
probable energy is temperature dependent.
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