Ferroelectric and dielectric characterization studies on relaxor- and ferroelectric-like strontium-barium niobates
Abstract
Ferroelectric domain structure evolution induced by an external electric field was investigated by means of nematic liquid crystal (NLC) method in two strontium-barium niobate single crystals of nominal composition: Sr_{0.70}Ba_{0.30}Nb_{2}O_{6} (SBN:70 - relaxor) and Sr_{0.26}Ba_{0.74}Nb_{2}O_{6} (SBN:26 - ferroelectric). Our results provide evidence that the broad phase transition and frequency dispersion that are exhibited in SBN:70 crystal have a strong link to the configuration of ferroelectric microdomains. The large leakage current revealed in SBN:26 may compensate internal charges acting as pinning centers for domain walls, which gives rise to a less restricted domain growth similar to that observed in classical ferroelectrics. Microscale studies of a switching process in conjunction with electrical measurements allowed us to establish a relationship between local properties of the domain dynamics and macroscopic response i.e., polarization hysteresis loop and dielectric properties.
- Publication:
-
Condensed Matter Physics
- Pub Date:
- 2013
- DOI:
- 10.5488/CMP.16.31701
- arXiv:
- arXiv:1309.5726
- Bibcode:
- 2013CMPh...1631701M
- Keywords:
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- Condensed Matter - Materials Science
- E-Print:
- 10 pages, 7 figures