DIELECTRIC RESPONSE OF SOME FERROELECTRICS AT LOW-FREQUENCIES II

An earlier paper on the dielectric spectra of some PST ferroelectric c eramics showed ''universal'' power law behaviour lying beneath other p arallel processes such as high-frequency capacitance C-infinity, direc t current conductivity, Low-Frequency Dispersion and some dipolar proc esses. The present contribution refers to low-loss ceramics in which a novel form of ''trans-universal'' response is observed because it is not possible to subtract a sensible value of C-infinity but instead on e has to postulate a series combination of a universal dipolar element and a universal power-law element after which it becomes possible to determine C-infinity. Examples of this analysis are given and a possib le physical interpretation is suggested.