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The model discussion focused on links between the unique properties ofrelaxor ceramics and the basics of critical phenomena physics and glasstransition physics. It indicates the significance of uniaxiality for appearingmean-field features near paraelectric_ferroelectric transition. Pretransitionalfluctuations, increasing up to grain size and leading to inter-grain, random,local electric fields, are indicated to be responsible for relaxor ceramicscharacteristics. Their impacts yield the pseudo spinodal behavior associatedwith weakly discontinuous local phase transitions. The emerging model redefinesthe meaning of the Burns temperature and polar nanoregions PNRs. It explainscoherently dielectric constant changes with the diffused maximum nearparaelectric_ferroelectric transition, the sensitivity even to moderateelectric fields, tunability, and the glassy dynamics. These considerations areconfronted with experimental results for the complex dielectric permittivitystudies in relaxor ceramic, covering the 200K range, from the paraelectric tothe deep ferroelectric phase. The distortions-sensitive and derivative-basedanalysis revealed the preference for the exponential scaling pattern in theparaelectric phase and the surroundings of the paraelectric-ferroelectrictransition. It may suggest the Griffith phase behavior associated with themean-field criticality disturbed by random local impacts. The discussion ofexperimental results is supplemented by relaxation times changes and thecoupled energy losses analysis. The studies also led to the description oftunability temperature changes with scaling relations.

A Critical Insight into Pretransitional Behavior and Dielectric Tunability of Relaxor Ceramics