Dielectric Dispersion in Order-Disorder Ferroelectrics

The reported date of the dielectric constant and loss in the paraelectric phase of order-disorder ferroelectrics are reanalysed. The wide distribution of relaxation times reported in some ferroelectric seems to be an indication of the uncertainties in the dielectric loss measurements rather than a polydispersive system. It is shown that qualitatively a monodispersive process consistent with Mason's model is adequate to explain the dielectric dispersion in almost all the order-disorder ferroelectrics studied so far.