Phenomenological description of dielectric permittivity peak in relaxor ferroelectrics
We found that, at the so-called diffuse phase transition in relaxor ferroelectrics, the dielectric
permittivity ε obeys the relation εA/ε= 1+ 0.5 (T− TA) 2/δA2 in a wide temperature range
above the temperature of permittivity maximum Tm (Tm> TA). The parameter δA remains
invariant with the variation of measurement frequency and characterizes the diffuseness of
the transition.
permittivity ε obeys the relation εA/ε= 1+ 0.5 (T− TA) 2/δA2 in a wide temperature range
above the temperature of permittivity maximum Tm (Tm> TA). The parameter δA remains
invariant with the variation of measurement frequency and characterizes the diffuseness of
the transition.
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