Relaxor ferroelectric behavior and structural aspects of SrNaBi2Nb3O12 ceramics
Sunil Kumar, D. A. Ochoa, J. E. Garcia, and K. B. R. Varma
TL;DR
This study investigates SrNaBi2Nb3O12 ceramics, revealing relaxor ferroelectric behavior linked to cationic disorder, confirmed by structural analysis and dielectric measurements, with implications for advanced ferroelectric materials.
Contribution
First detailed structural and dielectric analysis of SrNaBi2Nb3O12 ceramics demonstrating relaxor behavior and its origin from cationic disorder.
Findings
SrNaBi2Nb3O12 is a three-layered Aurivillius phase.
Ceramics exhibit broad, dispersive dielectric maxima characteristic of relaxors.
Dielectric maxima follow Vogel-Fulcher behavior, indicating relaxor dynamics.
Abstract
SrNaBi2Nb3O12 powder was prepared via the conventional solid-state reaction method. X-ray structural studies confirmed the phase to be a three-layered member of the Aurivillius family of oxides. SrNaBi2Nb3O12 (SNBN) ceramics exhibited the typical characteristics of relaxor ferroelectrics, associated with broad and dispersive dielectric maxima. The variation of temperature of dielectric maxima (Tm) with frequency obeyed the Vogel-Fulcher relationship. Relaxor behavior was believed to be arising from the cationic disorder at A-site. Pinched ferroelectric hysteresis loops were observed well above Tm.
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