Abstract
Simulation of the chemical fluctuation regions in PMN-like relaxors through growth of the PbxNbyOz eramics was performed. Different PbxNbyOz clusters (chemically and structurally) coexist in such ceramics. Hole polaron and bipolaron (Cr3+-two polaronic-hole) paramagnetic complexes were considered for explanation of the EPR spectra in PbxNbyOz ceramics. Dynamical averaging, light-induced effects, and significant effects of reduction treatment giving the coexistence of Nb5+ and Nb3+ ions, as well as of a strong internal magnetic field, were discovered in this ceramics. The latter could be related to antiferromagnetic phase realization in PbxNbyOz clusters containing a sufficiently high concentration of magnetic Nb3+ host lattice ions. Such a situation leads to antiferromagnetic resonance on Nb3+ ions, as well as to EPR of Cr3+-related paramagnetic complexes in a Nb3+-induced internal magnetic field. Charge transfer vibronic excitons (CTVE) in free and in CTVE phase states were detected in PbxNbyOz ceramics by photoluminescence studies.
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.
