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Abstract
The close analogy between dielectric dispersion and polydispersivity of both dilute quantum paraelectrics like Sr1−xCaxTiO3 (SCT) and concentrated “solid solutions” like PbMg1/3Nb2/3O3 (PMN) suggests the appearance of polar nanoclusters to be the phe-nomenological link between both kinds of systems. Their size distribution gives rise to polydispersivity and dynamic heterogeneity. Whereas quenched random-fields are believed to be at the origin of these clusters in concentrated relaxors, the Poisson statistical distribution of impurities and their large polar correlation radius seems to give rise to the inherent nanocluster structure in dilute relaxors like SCT and K1−xLixTaO3 (KLT). The present status of the nanocluster hypothesis is presented both from the experimental and the theoretical point of view.
