Abstract
A model of polar clusters (PC) and of chemical fluctuation clusters (CFC) in PMN-like relaxors is proposed. The model is mainly based on three phenomena: on a charge transfer state formation corresponding to charge transfer reorienting dipole states induced by Mg-Nb disorder, on an appearance of electronic and hole polarons in CFC due to charge compensation, and on in-cluster Local Configuration Instability effects. The origin of co-operative phenomena, of the giant piezoelectric effect and characteristic dielectric losses, including Vogel-Fulcher law as well as peculiarities of EPR and NMR do find an explanation within this model. It is shown that mobile polaron clusters play an important role in the formation of PC reorienting polarization. The presence of small polarons in PMN was confirmed in this work by detection of the characteristic IR-absorption accompanied by light-induced polaron transport.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
